260: Subscription School
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Welcome to Under the Radar, a show about independent iOS app
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development.
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I am Marco Arment
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And I'm David Smith.
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Under the Radar is usually not longer than 30 minutes,
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so let's get started.
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So the topic for today's episode is going to be, I guess,
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subscription school with underscore,
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and talking through some recent things
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that I've learned in my understanding,
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and the way that a subscription business works.
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Now is the school itself subscription price and can I get a free trial?
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I suppose everyone is on a free trial right now.
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If you listen past five minutes we'll automatically bill you $25,000 for the year of school.
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There you go.
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Oh god, school is much more expensive than that now isn't it?
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Thankfully under the radar is, so far at least, if there is a trial limit we haven't quite reached yet even if it's episode 260.
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So, who knows? Maybe at some point we'll reach our trial image, but we have not gotten
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Yes, we – this podcast itself is not a very good business. Hopefully you'll learn some
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lessons here to make your business better.
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Yes. You need a better LTV than we have.
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But yes, so it's like subscriptions and I think what's interesting with subscriptions
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is that they are – in this context, in the context of like a subscription as people sign
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up, give you money, and then agree to give you money into the future.
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And the kind of subscription model that we're talking about here is mostly going to be obviously
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like app subscription, where there's some subscription inside of your app and you use
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it and that's great.
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But I think it applies to functionally to any kind of business where that's the case.
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So it could be doesn't have to be just software subscriptions, but the general terms will
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apply to that.
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I think is increasingly becoming the predominant model for monetizing software applications.
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You and I both use it in our applications.
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It's increasingly just kind of becoming the norm and that is for a lot of really good
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reasons that it provides a kind of consistent, reliable input stream to your business that
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you can predict and plan for.
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It lets you align the kind of value that people are receiving from your application with the
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income you generate from it, which is great.
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There's lots of things that are great about it, but the kind of logistics of subscriptions
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are more complicated than, you know, if you go back to the kind of old, more classically
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used paid-up front model, that was straightforward.
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Like user gives you money, you give user app, and that's that.
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There's no kind of ongoing calculations and predicting and forecasting and things that
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you need to worry about.
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The only thing you could really look at is like how many new purchases you have each
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Like that's really all there is.
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And so, but with subscriptions, things get complicated.
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And recently I've gone on a journey of this to try and better understand the kind of the
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fundamentals behind subscriptions and to understand really what's going on there because I was
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running into some weird issues. But before I get into my specific thing and the discoveries
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I had, I think it's probably useful to just start off with just a quick overview of some
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of the terms I'm going to use. Because unless you're coming into software development
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from an MBA, a business background, or kind of that side of things, you may not be as
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familiar with these terms. So just quickly run through what these terms are and what
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they mean. So there's a subscriber. So a subscriber is a person who has signed up for
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a subscription that is, you know, and then they've agreed to give you money on a regular
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basis. You often will have something called a trial, which is an initial period where
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someone will sign up for a subscription but not get billed until the trial duration has
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elapsed. And related to that, you will have a trial conversion rate, which is the proportion
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of your users who start a trial who then go on to actually make their first payment. So
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So that's your trial conversion rate.
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Following on to that, you have your retention rate or your churn rate.
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And these are exactly the same things, just sort of one minus the percent the other way
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So the retention rate is the percent of people you keep at each renewal period.
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And the churn rate is the percent of people that you lose at every subscription period.
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Essentially, this is very much the kind of like cup half full, cup half empty kind of
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a difference.
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actual functional difference here. And these rates can be applied at various points in
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a subscription. So you may have like your overall churn rate, which is kind of the average
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of your various, at various renewal periods. Or you may say like, what's your first month
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churn rate? What's your three month retention rate? These are just terms that you can do
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to kind of look at the data in slightly different ways. But ultimately, you're just trying to
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work out how many people are you keeping or how many people are losing, depending on which
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side of it you're trying to understand. The next term is MRR or ARR, sometimes referred
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to, which is monthly recurring revenue or annual recurring revenue.
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It's not like a pirate thing. Arr. I'm sure a million people have made that joke
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in various like growth hacking and marketing meetings in every app company everywhere.
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I am pretty confident that is true. I think there is even actually a thing in this where
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people refer to pirate metrics.
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Where there's – it's like ARRR and retention rate. So ARRRR.
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Oh no, I'm so sorry to the world.
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Yes. So I've run into pirate metrics as a thing. But anyway, these are just – essentially
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if you take how much money you could expect to make in a month based on your number of
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subscribers and the amount of money that they're going to give you. And so this is just a way
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to kind of predict what this is going to be. And the nice thing about MRR and ARR is they
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tend to be somewhat predictable because they're based largely on the size of your subscriber
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database. So you can sort of predict what these values are, and so they tend to be things
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that are nice to use for forecasting and planning purposes.
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The next is LTV, or long-term value. So this is how much income you will expect to receive
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from a particular user over the lifetime of their use of the app or the lifetime of their
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subscription. And typically, LTV values have some kind of a window to them, because obviously
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you can't predict what is the long-term value of this customer on an infinite time scale.
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That doesn't particularly make sense or is logical. So you'll tend to say something like,
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on a 24-month time scale, how much income would you get from a user? What's the 24-month
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LTV? So that's just something to keep in mind. And it's useful for getting a sense of how
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valuable is a new subscription to you. Because while they may, you know, say you have a subscription
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that's $1.99 a month, their value isn't $1.99, it's, you know, $1.99 plus the $1.99 times
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essentially how many times the average user will renew. And so you kind of can do some
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math to work that out. And that's useful for another metric, which is your CAC or your
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AC, your consumer acquisition cost, which is if you have costs in order to acquire a
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user, so say through advertising or affiliate marketing or some method of acquiring them
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that costs you money, it's you can that is how much money you are spending to acquire
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a user, which ideally you obviously would expect to be ideally less than the long term
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value of that person so that you are making money rather than spending. If you're spending
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$10 to acquire a user and they are worth $5 to you, you are losing money on every subscription.
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So that's not a good place to be.
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And lastly is just price.
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It's just worth sort of mentioning that in all of these things, you tend to have some
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kind of price that you assign to a subscription.
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In Apple's case, then there's also the proceeds rate that will get applied to that.
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And so your revenue or your proceeds is the thing that's actually valuable.
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I think some people, depending on where you are, I know RevenueCat's MRR is before Apple's
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cut, but I always think of MRR as the after Apple's cut version just because that's what
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actually matters to me.
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The fact that there's this bigger number that maybe if I was trying to put it in a pitch
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deck and get funding or something would be useful, but for the purposes of what's actually
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going to hit my bank account, I tend to think of MRR on a proceeds basis rather than on
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kind of a gross basis.
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Yeah, it's probably better to think – it's not good for your psychology and mental health
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if you see how much Apple's making more frequently than you need to.
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No. Yeah. And so that's – so hopefully that's a helpful kind of just like a quick
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overview of the terms involved here because I definitely didn't know all of these when
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I started and I would be reading something or hearing something talking about subscriptions
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and these terms would come up and I didn't know what they meant. So hopefully as I kind
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of dive into where I'm going from here, that's a good place to kind of lay the groundwork.
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of under the radar and all of Relay FM.
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So the next thing that I want to talk about--
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and this is the discovery that I made, which is not a new thing.
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This is one of those, it's not, you know, I went on this long kind of journey of discovery
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and ended up discovering that it's a well established body of work and is a very known
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thing in subscription management, but I didn't know it. And so I'm sort of want to talk about
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it here in case other people are in the same place. And this is sort of the concept. I
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have heard many people refer to it as carrying capacity, which is an ecology term for, you
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know, if you imagined, you know, sort of how many birds could live in a particular forest,
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there's a limit to that where the resources of the forest can only support so many people
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or so many birds. And in this case, in the context of subscriptions, it's this concept
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of what was strange initially when you start a subscription business, the first, say, year,
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which you will often see is this wonderful kind of growth in your revenue every month.
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And it's delightful, I got to say. It just it feels super cool that the first, say you
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had 100 new subscribers a day. That's your thing. So in the first month you're like,
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"Wow, I have 100 subscribers." And then the next month, you know, I have, say, 190 subscribers.
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Wow, that's 90. I'm increasing by 90. And then you go up again and again, and it feels
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like your subscribers are always growing, and there's this wonderful growth period that
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feels really awesome. And then what I was finding in my absence, specifically in Widgetsmith,
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because it's now over two, it's like two and a quarter years old with a subscription.
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I'll get to it. Was it this? Yeah.
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Time flies during a global pandemic.
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It sure does. Yeah. But so it's like it's two and a quarter years old. And what I was running into,
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and if you've been paying attention to Under the Radar for a while, I've been doing a lot of work
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to try and increase my revenue from that app. I've been doing optimizations to my paywalls and
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and changing things inside the app and moving features around and doing lots of work to
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have it continue to grow. Because what I was finding is it was incredibly stable and anything
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I did seemed to have almost no effect. I would make these changes, I would increase my conversion
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rate and my paywall, increase my trial starts, and it was just not doing almost anything
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to my overall, like, how much, you know, my MRR, my overall revenue that I could get,
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and it was driving me crazy. Like, what is going on here? How am I, how is all this work
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not actually translating? And so what I found, though, is that's like, okay, what I need
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to do is I need to work out kind of modeling into the future what's going to happen if
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I make improvements or changes to my app. And, you know, so I built the tool, and a
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a little brief aside here. So I built this tool. It's this terrible little SwiftUI thing.
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It works, but it's not great in any way. It was made purely for my own purposes. But because
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you, under the radar listeners, are a special group of people, the world-exclusive URL to
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download this tool, if you wanted to play with it, will be in the show notes for this
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episode. This will be nowhere else. And if you want to try it and play with it, understand
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you are doing so completely without warranty or any expectation of it working or being
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accurate in any way, but because I like you and I want you to be able to play with it
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while I'm having this conversation, it'll be in the show notes in case you do. But anyway,
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so what I built is a tool –
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It has a really great app icon, by the way.
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It does. It's quite fun. Anyway, so I built this little tool, and what it does is it lets
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me say, "Okay, how many subscribers do I have today? How much do I cost? What is my
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price for my subscription? How many daily new trials do I have? How many of those trials
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do I retain? And then what is the retention rate that I have in my first month, second
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month, third month, fifth month, sixth month, and then sort of thereafter? And it'll draw
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a graph showing what your subscriber base will be in the future. And the thing that
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I discovered is that for a given set of those values, there is a ceiling, like a maximum
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subscriber base that you can ever have, that you cannot grow beyond, which was very counter-intuitive
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to me, that there is this sort of natural limit that you would think, well, it should
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grow sort of indefinitely. But the reality, and this is the insight that wasn't intuitive
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to me, but now that I see it, I can understand it, is sort of as you're going, every subscriber
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you have will have a retention rate at some sort of applied to them, and it sort of continues
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on in the future. And the longer you have a subscription in the market, at some point,
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the weight and kind of the size of the existing subscriber base that you have. Even if you're
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retaining most of them, like I think my long-term retention rate is like 95%, which feels pretty
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That's great, I think. I mean, that sounds amazing.
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Yeah, I thought I had the same thing. It sounds great. But it meant that there is still a
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limit where after two and a quarter years, retaining and losing 5% of those people starts
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to dominate any amount of growth that I could get from new subscriptions. And you end up
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with this ceiling. And you can see it in this tool. You put in your numbers, and it will
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kind of show you where that limit is. And that was surprising. But it also was kind
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of reassuring as I was going through this, because it meant that I wasn't losing my
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mind and that all this effort I was doing wasn't actually making that much of an impact,
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was, you know, the changes I was able to make were relatively small. You know, I could increase
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my daily trials by 10% or 20% or something like that. And that feels like it should be
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a meaningful change, like, wow, I'm getting 20%, you know, more people starting a trial
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now than I used to. But the reality is, is like the weight of the existing people who
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are subscribing, that is where, you know, that is what's determining my overall subscriber
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base far more than any change that I could make in the short term. And so it's just
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kind of an interesting difference. And I don't know if that would have been intuitive to
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you, Marco, but it was definitely not intuitive to me that there would be a ceiling like this.
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I mean, I've always seen my subscription revenue plateau off like this. I've never
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really understood why it did that. I just kind of assumed, "Okay, that's just what
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subscriptions naturally do.
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And I mean, honestly, you see the same thing
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with audiences, with things like how many people
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listen to my podcasts, how many people subscribe to my blog,
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or follow me on a social network.
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I see the same pattern in all of those things,
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which is when something first launches and is getting
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traction or is first, for some reason, getting attention,
00:18:12
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you see a nice upward movement.
00:18:15
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and then it slowly curves off and seems to approach
00:18:20
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a certain natural limit.
00:18:22
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And then it just kind of stays there, ideally.
00:18:25
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I mean, sometimes it goes down over time
00:18:26
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if things aren't going super well.
00:18:28
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But it just kind of stays in that kind of upper limit range
00:18:31
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and never really gets to the next level,
00:18:35
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the next order of magnitude,
00:18:36
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or never doubles from that point or whatever.
00:18:39
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And so it seems like this applies to pretty much anything
00:18:43
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where you're kind of looking at ongoing attention
00:18:45
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or ongoing money, where you do at some point, you know, you launch, you go up, and then
00:18:51
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at some point the rate at which you're losing people or churn, you know, like the rate of
00:18:56
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churn is at some point kind of keeps things in equilibrium with the rate of new people
00:19:03
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coming in, and you just kind of, you have this kind of natural limit, or at least this
00:19:08
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kind of range that you stay in, and it's very, very hard to ever break out of that unless
00:19:12
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unless you have some kind of dramatic change in why people would come in in the first place.
00:19:18
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And so this is how the total subscriber numbers or listener numbers or followers, this is
00:19:27
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how it looks for everything I do.
00:19:29
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Yeah. And I think that's, it's just interesting to me to confirm with math that that observed,
00:19:37
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because I had the same observation, that it seems like you always end up in this steady
00:19:42
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state and it's very hard to get out of.
00:19:44
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And I think it's interesting to start to understand the math behind it.
00:19:49
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And in some ways for me that was like a relief.
00:19:50
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That was like, "Okay, so what it means is that for all I can, you know, I know the inputs
00:19:54
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and I can determine what the output of those inputs would be.
00:19:58
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So if I increase my daily trial starts by 10%, I can predict almost, you know, sort
00:20:03
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of mathematically what the end result is going to be, what kind of a change that's going
00:20:08
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to be, you know, is that where I should be putting my effort or should I be putting it
00:20:11
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into retention, which one of those things is going to give me a bigger long term value.
00:20:17
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And I think something here that's worth mentioning is the ACE, like my tool, which
00:20:22
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you can, you know, I said, you're welcome to play with, will do this in a much more
00:20:26
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detailed way where, you know, I let you break down this retention rates, you know, by the
00:20:30
◼
►
first six months, and you can do input a bunch of different variables and try different models.
00:20:36
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But a good equation, if you sort of want to left this conversation with a single equation
00:20:40
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in your mind is that if you take the monthly subscription starts that you have and divide
00:20:48
◼
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that by your churn rate—so say you had 3,000 people start in a month, so you have about
00:20:54
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100 a day, and your churn rate was 25 percent. You know, 3,000 divided by 25 will give you
00:21:01
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whatever your maximum—that is your ceiling. So in this case, it'd be like 12,000 is
00:21:08
◼
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number of subscribers that you would expect to be able to have. And that's just math. Like that is
00:21:13
◼
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just that version of it is very straightforward. And like, what my model is doing is make, you
00:21:19
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know, sort of letting you tweak rather than just like one bundled churn rate, it's letting you
00:21:24
◼
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apply different churn rates to different cohorts, you know, so this is something that I see very
00:21:28
◼
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much in my own app that you have very different retention rates for different months, like my
00:21:33
◼
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My month one retention rate is about 65%, but my long-term one was 95%, which sort of
00:21:39
◼
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makes sense intuitively that there's a group of people who start the subscription, start
00:21:46
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It's not for them.
00:21:47
◼
►
They cancel it.
00:21:48
◼
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But if you've done that, if you have renewed your subscription for 7, 10, in this case,
00:21:54
◼
►
some people that have been renewing for 24 months in a row, it's pretty likely you're
00:21:58
◼
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going to keep doing it at that point because clearly it's become a part of your workflow.
00:22:02
◼
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something that you find value in, and so it becomes useful.
00:22:11
◼
►
If you wanted to just do a basic number, just take your monthly subscription starts, divide
00:22:14
◼
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it by your monthly churn, that'll get you in the ballpark.
00:22:17
◼
►
Or if you want to get more detailed than that, you need to actually do some modeling to it.
00:22:24
◼
►
But I think there is something just interesting about understanding that.
00:22:28
◼
►
And I think what it means, once you get a sense of that formula, you start to understand.
00:22:31
◼
►
So if you wanted to say double your number of subscribers, you mean to either have to
00:22:37
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double the monthly subscription starts.
00:22:43
◼
►
If you think of the equation, if you wanted to double the other side of it, you have to
00:22:46
◼
►
double the numerator or half the denominator, essentially.
00:22:50
◼
►
So you either have to half your turn rate or double your subscriber starts, which is
00:22:54
◼
►
a pretty meaningful change if you wanted to end up in that kind of a place, going from
00:23:00
◼
►
100 daily trials to 200 daily trials is not going to be an easy thing to accomplish necessarily,
00:23:05
◼
►
but that's the kind of thing that you would have to do in order to double the overall
00:23:10
◼
►
subscriber count that you had at the end.
00:23:12
◼
►
- Man, that's, I mean, it's good to actually have this be, like, you know, first of all,
00:23:19
◼
►
codified and understood better, and it's good to have this tool to be able to plug in different
00:23:24
◼
►
values easily and see it over time because I don't do a lot of very structured or calculated
00:23:32
◼
►
growth hacking or revenue optimization or marketing really of any kind, to a fault I
00:23:43
◼
►
And so whenever I do something or think something about like, "Hey, maybe I should do this
00:23:47
◼
►
in my business," usually it's just kind of shooting from the hip and I just have
00:23:51
◼
►
some kind of gut feeling or some kind of idea, "Oh, maybe I should try this." And it rarely
00:23:56
◼
►
results in what I think will happen. Usually, my successes and failures, whatever they're
00:24:05
◼
►
going to be, come as a surprise to me in both directions. And I think it's, again, it's
00:24:12
◼
►
largely because I'm not really that interested in thinking in these analytical ways in a
00:24:19
◼
►
lot of these topics. Like, it doesn't come naturally to me to think analytically about
00:24:22
◼
►
business the way this does and the way you kind of need to if you're an indie sometimes.
00:24:28
◼
►
And it's hard because some of these decisions are, I would say, difficult to – if you
00:24:34
◼
►
have a – the standard indie mindset that I have most of the time, which is like, "I'm
00:24:40
◼
►
just going to make a nice thing and the business will come." That – I mean, that does work
00:24:46
◼
►
to a degree for a time sometimes, you know?
00:24:49
◼
►
And so you can think that way and operate that way,
00:24:52
◼
►
and in many cases, it'll work for you.
00:24:55
◼
►
But in so many times where I've made some kind of small,
00:25:00
◼
►
to me, tweak to the business model,
00:25:02
◼
►
and then all of a sudden, my money goes way up or way down,
00:25:06
◼
►
and it's like, oh man, I probably should be
00:25:10
◼
►
putting more analysis and calculation
00:25:13
◼
►
into some of these decisions.
00:25:15
◼
►
So it's good to, first of all, it's good to have somebody like you in our space here
00:25:20
◼
►
to be that person a lot of times when we aren't.
00:25:24
◼
►
But it's also nice to have tools like this and concepts like this to know how to make
00:25:31
◼
►
more analytical decisions and what to expect and kind of what's possible.
00:25:35
◼
►
And so if I'm looking at this and I'm saying, "Hey, if I want to meaningfully get this
00:25:40
◼
►
curve up or raise the ceiling here, I'm gonna have to get more people in the door in the
00:25:45
◼
►
trial stage or in the download stage or whatever it ends up being. And that's difficult. That
00:25:54
◼
►
might require paying for more search ads or paying for marketing somewhere. And that can
00:25:59
◼
►
be very expensive and then I have to price that in. And it becomes so much more complicated.
00:26:05
◼
►
But this is a way that people like us
00:26:08
◼
►
need to think sometimes.
00:26:10
◼
►
We need to be able to make these decisions
00:26:11
◼
►
and be able to look at our businesses
00:26:13
◼
►
and be able to make educated decisions
00:26:17
◼
►
and have concrete goals and concrete expectations
00:26:21
◼
►
that are somewhere in the ballpark of reality.
00:26:24
◼
►
And so this really helps a lot to look at this
00:26:27
◼
►
and to think like this.
00:26:28
◼
►
- Yeah, and I think, I'm glad to hear it's helpful to you,
00:26:31
◼
►
but it was something, I think for me,
00:26:33
◼
►
I think what you're saying,
00:26:34
◼
►
word that is most useful is making it an informed decision. Because I feel like so often, what
00:26:40
◼
►
I end up doing is I take like the first two months, say of two or three months of data,
00:26:47
◼
►
and then just like linearly extrapolate that data. And I'm like, wow, this is going to
00:26:51
◼
►
be amazing. And I can start to like, you know, really invest in something or start to really
00:26:55
◼
►
kind of go after something expecting it to just like grow indefinitely or kind of viewing
00:27:00
◼
►
it in that way. And that's useful in some ways. But really what it's more helpful is,
00:27:05
◼
►
in this case, it's like, understand, okay, given the first couple of months, or given
00:27:09
◼
►
what kind of industry averages are, where could I expect at a given level? And what
00:27:17
◼
►
does that mean? Especially, one of the most, sort of my favorite parts of being an indie
00:27:23
◼
►
is that people will tell me and talk to me about when they go independent. They make
00:27:29
◼
►
an app, they put it in the store, they think it's going well, and they decide, you know,
00:27:33
◼
►
I'm going to quit my day job, and I'm going to go full time. And that's awesome. Like,
00:27:36
◼
►
I love those stories. Anybody who's listening to this, if you ever go indie, let me know.
00:27:40
◼
►
I love it. It's just like my greatest joy. But I also want to make sure that when you're
00:27:45
◼
►
going when you're stepping out on the limb, if you're basing that on numbers, that those
00:27:49
◼
►
numbers are firm, and realistic and reliable and predictable. And you're not doing what
00:27:54
◼
►
I do and linearly extrapolate like two or three months and then expecting that to continue
00:27:58
◼
►
to grow and kind of be good into the future. So my main thing here is just be thoughtful
00:28:04
◼
►
about it, be understanding that there is some math behind it, there's some things going
00:28:08
◼
►
on here that if you understand can be really helpful to you, can be really powerful as
00:28:13
◼
►
a way to predict the future essentially. And then the great thing about subscriptions is
00:28:18
◼
►
that they are kind of predictable. That you also can in the same way that if I say that
00:28:23
◼
►
I have, you know, whatever, 1000 subscribers, and my daily trials goes to zero. Like you
00:28:28
◼
►
can predict at your current churn rates, like what will happen and how much revenue you'll
00:28:33
◼
►
have over a given period of time, which is lovely. Like it's one nice thing about subscriptions
00:28:38
◼
►
is that they have this, you know, they're both resistant on the up, you know, that if
00:28:42
◼
►
I make a change and make a 10% increase in the number of daily trials, it's kind of it
00:28:47
◼
►
has a muted impact on my overall subscriber count. But the great thing is it goes the
00:28:51
◼
►
the other way. If I have a 10% reduction, there's also kind of a muted, immediate
00:28:56
◼
►
impact on that. And so that's why we love them so much, and it's why I think I will
00:29:00
◼
►
continue to use them as my primary monetization scheme going forward.
00:29:04
◼
►
Yeah. Frankly, I love subscriptions. It matches what we actually need from the business, as
00:29:11
◼
►
you were saying at the beginning of the episode. Subscriptions give you recurring revenue so
00:29:16
◼
►
that you can keep developing the app on an ongoing basis, which is what everybody expects
00:29:20
◼
►
from apps these days anyway. So it's a great business to be in and it's really nice to
00:29:25
◼
►
be able to understand it better.
00:29:26
◼
►
And that's probably a good place to conclude subscription school with Underscore today.
00:29:30
◼
►
And I think it's probably one thing I just wanted to quickly mention before we wrap up,
00:29:33
◼
►
is that I think Marco and I now are almost exclusively on Mastodon, so we'll have links
00:29:37
◼
►
to our Mastodon accounts there. So if you wanted to follow up or understand kind of
00:29:42
◼
►
what we're going on, what we're working on in between the two weeks that we're here,
00:29:45
◼
►
that's the place to do it, rather than other places that are no longer.
00:29:50
◼
►
Yeah, there's no almost about it. I'm exclusively there.
00:29:54
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►
All right. Thanks for listening, everybody, and we'll talk to you in two weeks.