6 Numbers Every Developer with a Subscription App Must Track

Ariel Ariel
5 minute read 12/8/20
6 Numbers Every Developer with a Subscription App Must Track

More and more apps are switching to a subscription model these days. When it comes to revenue models, recurring revenue is a very attractive option over pay-to-download and ad-based models. It gives developers peace of mind and ongoing resources to continue to grow their apps.

Simple right? Well... The simplicity gained from subscriptions is somewhat lost when it comes to analyzing how well your business is doing. But it's worth it.

Doing Subscriptions Right Requires Analyzing Data

With simple revenue models, it's pretty easy to see if you're doing well. For example, a paid app is as easy to analyze as it is to see its downloads. Subscriptions, on the other hand, have many more moving pieces because they rely on people subscribing to the app and staying subscribed.

To give you some context, we're tracking more than 90 different subscription events!

How Do You Know If You're Doing Well?

With so much data flying around, it's easy to get overwhelmed and either look at the wrong numbers or avoid analyzing performance altogether. Both are less than ideal if you're serious about growing your business.

While there are many different data points you can analyze, there are a few that matter most and are the ones you need to analyze. In this guide we'll go over the six numbers that are most important:

KPI #1: Active Subscriptions

The first number, also the most intuitive, is Active Subscriptions, or the number of people who are currently subscribed to your app. Looking at this number over time, you can easily tell how healthy your subscription app is and how your subscriber base is growing. You're doing well as long as every day is better than the previous one, and doing very well if the slope of your trend is steep.

But this deceptively simple number tells you more than just how well you're getting new subscribers. Active subscriptions is a combination of new subscriptions and also subscriptions that are continuing to renew their subscriptions.

KPI #2: MRR (Monthly Recurring Revenue)

MRR, or Monthly Recurring Revenue, is the total amount you can expect to make every month given the number of active subscribers you have. MRR is useful for two distinct reasons. The first is that following the trend over time, you can tell if your business is growing and at what speed. The second is that your MRR is the easiest way to determine roughly how much money you can expect to make next month, and the month after that.

Naturally, you want your MRR to grow, and can achieve it in three ways:

  1. Get more subscribers
  2. Get existing subscribers to upgrade to a higher tier (if you have subscription tiers)
  3. Get more subscribers to stay

ℹ️ MRR is a number Appfigures calculates that isn't available directly from Apple or Google.

KPI #3: Churn

The statement above would not include the word "rough" if it weren't for customers leaving. In subscriptionland, that's called churn. The easiest way to measure how many people leave is by simply counting them, but looking at absolute numbers doesn't provide the full picture. The more subscribers you have, the more you will lose. But if you're trying to analyze the health of your business, there's a better way to look at churn—as a ratio.

For subscription businesses, churn = # of canceled subscriptions in a month / # of subscribers at the beginning of the month

This simple calculation makes it easy to see if more, or less, subscribers are leaving over time, regardless of how many subscribers you have. You want to actively minimize churn.

👉What's Subscription Churn and What You Can Do to Reduce It

ℹ️ Churn is a number Appfigures calculates that isn't available directly from Apple or Google.

KPI #4: Activations

Activations is a metric Appfigures calculates automatically, and it is the sum of every subscription activity that involves a subscriber going up a level and includes the following activities:

  1. A new user subscribes
  2. A user that previously canceled their subscription is back on a paying subscription
  3. A user with a free trial has subscribed to a paid tier
  4. A user on one tier upgraded to a higher tier
  5. A subscription that couldn't be renewed because the credit card was declined was retried and eventually renewed

With all of these summed up, you can easily see if things are "going up" over time, and that's exactly the way they should.

Because activations aren't cyclical, you can expect them to fluctuate and not have an upward trend like active subscriptions or MRR. That's normal.

KPI #5: Real Revenue

MRR is a great metric to measure and forecast growth, but your actual revenue is as important. Your real revenue is what you can actually spend, whether it's on ads, product improvements, or just paying the bills.

Your real revenue is the amount of money earned from new subscribers and subscription renewals. Real revenue can fluctuate quite a bit from day to day, and that's normal.

Use real revenue as a measure of money you can use, and MRR as a measure of money you're making.

KPI #6: Trial Conversion Rate

If you're offering free trials as a way to get started with a paid subscription, how well you convert those trials into paying subscribers is a very important number to keep an eye on.

Your trial conversion rate = the number of trials that went to a paid subscription / the number of free trials that were started.

In an ideal world, every new trial would end up as a paying subscriber, but that's rarely the case. Some users only need the paid featured for a short term, others subscribe expecting something the app doesn't do, and some just want a taste. That's all normal.

What you have to focus on is growing that conversion rate, and at the least, not letting it drop. Whether you spend money to acquire new users via ads, or lots of effort with App Store Optimization, the lower your trial conversion rate is the more money/effort that's going to waste.

FYI - If you're not offering free trials, you should spend some time thinking about why that is. Unless you've tried and it didn't yield more revenue, you should probably give it a try.

Bonus KPI: CAC

If you're spending money to acquire new users, you may already be familiar with this acronym. If not, Customer Acquisition Cost is the amount of money you're spending to get a paying subscriber. It's calculated by dividing your ad spend and organic marketing costs by new subscribers.

CAC is one of the numbers investors pay close attention to, and you want to keep it as low as possible. Because your denominator includes subscribers acquired by ads and organically, the better your organic acquisition (App Store Optimization, content marketing, etc.), the lower your CAC would be.

👉 Check out our library of App Store Optimization guides and teardowns

Get Tracking!

Tracking your subscriptions is easy with Appfigures. We do all the heavy lifting number crunching, giving you the information you need to measure your success and keep your finger on the heartbeat of your business. Get tracking →

Related Resources

10 ½ Advanced App Store Optimization Secrets ASO Experts Will Never Share!
ASO Guides
10 ½ Advanced App Store Optimization Secrets ASO Experts Will Never Share!

ASO basics are no longer enough to get ahead. Use these advanced App Store Optimization tips instead.

How to Validate Your App Idea and Nail Your Launch with Competitive Research (with Examples)
ASO Guides
How to Validate Your App Idea and Nail Your Launch with Competitive Research (with Examples)

Have a great idea for an app or game? Learn how to make sure it'll work by following these simple steps.