How to build an app like Calm
The short answer
- An app like Calm is a subscription audio library: guided meditations, sleep stories and music, played through a calm, reliable player.
- Recommended stack: an Expo app, Supabase for the library and progress, Supabase Storage for audio files, and RevenueCat for the subscription and free trial.
- The hardest part is the player: it has to keep playing with the screen off, show lock-screen controls and survive phone calls.
What an app like Calm does at its core
People open the app, pick a session by mood or length, and listen. Sessions are grouped into collections like sleep, focus or anxiety, and a new daily session gives a reason to come back.
Most of the library sits behind a subscription with a free trial. Reminders and simple stats, like minutes listened, help people build the habit.
MVP features and what comes later
An MVP (minimum viable product) is the smallest version that real users can use and pay for. It tests the idea before you build everything.
In your first version
- A library of sessions with categories and lengths
- An audio player with background playback and lock-screen controls
- Remember where a session stopped
- A subscription with a free trial and a paywall
- A daily reminder
- An admin area to add sessions and collections
Later
- Downloads for listening offline
- Sleep timer and mixing background sounds
- Apple Health mindful minutes
- Personal recommendations
- Widgets and watch apps
- Several narrators and languages
The recommended stack
This is the blueprint a developer would start from, using the same building blocks as the live builder. It matches the Native Mobile App result of the quiz.
CLIENT
iOS + Android
Expo
CORE
Database + API
Supabase
SUBSCRIPTIONS
RevenueCat
AUDIO FILES
Supabase Storage
REMINDERS
Expo Notifications
- Recommended
- Native Mobile App
- Business model
- Subscription
- Pieces
- 5 building blocks
Why each layer
- ClientExpo app
Listening with the screen off, lock-screen controls and headphones need native audio. A web player can't do this reliably on phones, so this is a native app.
- CoreSupabase
The library, collections, listening progress and favourites live in Postgres. The app loads the library from there, so new sessions appear without an app update.
- Audio filesSupabase Storage
Audio files are large. Store them in compressed formats and serve them through the storage CDN, so playback starts quickly everywhere. Access rules make sure only subscribers can stream premium sessions.
- SubscriptionsRevenueCat
The subscription unlocks content inside the app, so it goes through in-app purchase (guideline 3.1.1). Free trials are set up as introductory offers in App Store Connect and Google Play, and RevenueCat tracks who has access.
- RemindersExpo Notifications
A daily reminder at a chosen time can be scheduled on the phone itself as a local notification.
The hardest parts of an app like Calm, and how to solve them
1. A player that just keeps playing
Background playback, lock-screen and headphone controls, and interruptions like phone calls all need native configuration on iOS and Android. A dedicated audio library for React Native, such as react-native-track-player, handles most of it.
Test on real devices with the screen off, Bluetooth headphones and a call coming in. Simulators don't show these problems.
2. Streaming and downloads
Streaming should start in a second or two, so files need a CDN and sensible bitrates. Downloads for offline listening add storage management: how much space, what to delete, and what happens when the subscription ends.
3. Subscriptions with a free trial
Trials, renewals, cancellations, refunds and family sharing all change who has access. Don't build that logic yourself: RevenueCat keeps one access status across both stores.
The paywall is part of the product. Show it after people have felt the value, for example after the first session.
4. Content that keeps coming
A new daily session needs a schedule and a tool. Your admin area should let your team upload audio, set a release date and arrange collections without a developer.
What you can leave out of the MVP
- Offline downloads: stream first
- Apple Health and watch apps
- Recommendations: hand-picked collections work
- Sound mixing and sleep timers
- Several languages
What it costs
This page gives no price on purpose: the cost depends on your scope and your developer's rate. The App Cost Calculator turns the MVP features above into an hour range, and you add your rate.
Recording the audio is not in the estimate. Add "Works offline" if downloads are part of your first version.
Sources for the platform rules and tools mentioned on this page:
Frequently asked questions
Can a meditation app be a website?
For browsing, yes, but listening with the screen off and lock-screen controls work much better in a native app. That's why this page recommends an Expo app.
How do free trials work in an app?
On iOS and Android, trials are introductory offers on a subscription, set up in the store consoles. RevenueCat tracks who is in a trial, who pays and who has cancelled.
Where should the audio files live?
In file storage with a CDN, such as Supabase Storage, in compressed formats. The database only stores the session details and a link to the file.
What does it cost to build an app like Calm?
The app part depends on your features: use the App Cost Calculator with the features on this page. Producing the audio content is a separate budget.
Related
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Calm is a trademark of its owner. Find My Stack is not affiliated with it; the name only describes the type of app.