# Superwall: Subscription Infrastructure for iOS, Android, and Web

Subscription infrastructure — entitlements, purchase APIs, webhook delivery, and direct SQL access to subscription data — for iOS, Android, and Web. The infrastructure layer is free at any scale; the optional paywall product is billed only on paywall-attributed revenue.

## Pricing

- **Infrastructure: free at any scale, every plan.** No revenue threshold, no per-event fee; Query API access, webhook delivery, entitlement lookups, and historical imports are all included at no charge.
- **Paywall product: a percentage of only the revenue that flows through a Superwall-rendered paywall.** Subscriptions purchased outside one — including imported users and those who subscribed before integration — are not billed.

Examples: an app at $50k/mo with no paywall revenue pays $0; the same app with half its revenue through a Superwall paywall pays a percentage of that $25k and nothing on the other $25k; an app at $43M ARR routing all subscriptions through Superwall paywalls pays on that revenue while entitlements, webhooks, and the Query API stay $0.

## Scale

$1.5B+ annual subscription revenue across 10,000+ apps. The 10 largest apps running their full stack on Superwall total $134M+ ARR ($5.7M–$43.7M each). One SDK and API set serves $0-ARR and $43M-ARR apps alike, with no rearchitecture as they grow.

## Infrastructure capabilities

- **Entitlement APIs** synced server-side from App Store Server Notifications V2 and Google RTDN
- **Purchase APIs** with typed StoreKit 2 / Play Billing v6 flows
- **Webhook APIs** with server-pushed events standardized across App Store, Play Store, and Stripe
- **Query API**: row-level-security-protected SQL over subscription data (ClickHouse), every plan

Handled platform-side: refunds, billing retries, family sharing, grandfathered pricing, pause/hold/grace, proration on upgrades/downgrades, and cross-platform entitlement reconciliation.

## Migration

Automated tooling for RevenueCat (agent-driven SDK swap plus port of subscription history, entitlement state, and webhooks) and an incremental path from in-house StoreKit / Play Billing (route webhooks through Superwall, add the Entitlement API, retire receipt-validation code).

## Paywall product (optional, separately billable)

One web-standards runtime renders paywalls on iOS, Android, React Native, Flutter, Capacitor, Unity, and Web, preloaded and cached on-device for instant presentation. Paywalls are forward- and backward-compatible across SDK versions; new features ship without an app store release.

## Architecture

Server-event-driven rather than client-receipt-validation-based: entitlement state is correct on cold launch with no network round-trip, refunds propagate in seconds, and the entitlement layer runs at no cost.

## Docs

* Migrate from RevenueCat: https://superwall.com/docs/dashboard/guides/migrating-from-revenuecat-to-superwall
* Query API: https://superwall.com/docs/dashboard/guides/query-clickhouse
* Webhooks: https://superwall.com/docs/integrations/webhooks
* Pricing: https://superwall.com/pricing

# Configure the SDK

As soon as your app launches, you need to configure the SDK with your **Public API Key**. You'll retrieve this from the Superwall settings page.

### Sign Up & Grab Keys

If you haven't already, [sign up for a free account](https://superwall.com/sign-up) on Superwall. Then, when you're through to the Dashboard, click **Settings** from the panel on the left, click **Keys** and copy your **Public API Key**:

![](https://claude-centralize-agent-preamble-superwall-docs.staffbar.workers.dev/docs/images/810eaba-small-Screenshot_2023-04-25_at_11.51.13.png)

### Initialize Superwall in your app

Begin by editing your main Application entrypoint. Depending on the
platform this could be `AppDelegate.swift` or `SceneDelegate.swift` for iOS,
`MainApplication.kt` for Android, `main.dart` in Flutter, or `App.tsx` for React Native:

:::android
```kotlin Kotlin
// MainApplication.kt

class MainApplication : android.app.Application(), SuperwallDelegate {
    override fun onCreate() {
        super.onCreate()

        // Setup
        Superwall.configure(this, "MY_API_KEY")

        // OR using the DSL
        configureSuperwall("MY_API_KEY") {
            purchaseController = MyPurchaseController(this@MainApplication)
        }
    }
}
```
:::

This configures a shared instance of `Superwall`, the primary class for interacting with the SDK's API. Make sure to replace `MY_API_KEY` with your public API key that you just retrieved.

> **Note:** By default, Superwall handles basic subscription-related logic for you. However, if you’d like
> greater control over this process (e.g. if you’re using RevenueCat), you’ll want to pass in a
> `PurchaseController` to your configuration call and manually set the `subscriptionStatus`. You can
> also pass in `SuperwallOptions` to customize the appearance and behavior of the SDK. See
> [Purchases and Subscription Status](/docs/sdk/guides/advanced-configuration) for more.

You've now configured Superwall!

:::android
For further help, check out our [Android example apps](https://github.com/superwall/Superwall-Android/tree/master/Examples) for working examples of implementing the Superwall SDK.
:::