# 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

# Changelog

Release notes for the Superwall KMP SDK

# CHANGELOG

The changelog for `Superwall-KMP`. Also see the [releases](https://github.com/superwall/Superwall-KMP/releases) on GitHub.

## 0.1.1

## Enhancements

* Adds threading improvements to reduce main thread load

## 0.1.0

Initial release of the Kotlin Multiplatform SDK for Superwall.

## Enhancements

* Adds `com.superwall.sdk:superwall-kmp`, a Kotlin Multiplatform wrapper over the native Superwall SDKs. The entire public API lives in `commonMain` — no platform types leak into it, and `Superwall.configure` has an identical signature on both platforms (no `Context` parameter on Android).
* Android support (`minSdk 26`) wrapping `com.superwall.sdk:superwall-android` 2.8.0. The dependency is bundled transitively and an `androidx.startup` initializer captures the `Application`, so integration is a single Gradle dependency.
* iOS support (iOS 14+, `iosArm64`/`iosSimulatorArm64`/`iosX64`) forwarding through **SuperwallKMPBridge**, a self-authored `@objc` Swift facade over SuperwallKit iOS 4.16.1 (pinned exactly). The bridge destructures Swift-only constructs — enum associated values, structs, `async` — into ObjC-visible envelopes consumed via cinterop.
* Adds `Superwall.register(placement:params:handler:feature:)` for gating features behind paywalls, with a `PaywallPresentationHandler` exposing `onPresent`, `onDismiss`, `onError` and `onSkip`.
* Adds `Superwall.subscriptionStatusFlow`, a `StateFlow` that is collectable before `configure` (seeded with `SubscriptionStatus.Unknown`) and emits on the main thread.
* Adds `PurchaseController` for apps that own their purchase logic, with separate `purchaseFromAppStore` and `purchaseFromGooglePlay` entry points.
* Adds `SuperwallDelegate` covering the paywall presentation lifecycle, subscription-status changes, deep links, URLs, custom paywall actions, logging, and link redemption.
* Adds `SuperwallOptions` (including `PaywallOptions` and `TestModeBehavior`), user identity (`identify`, `reset`, user attributes), and deep-link handling via `handleDeepLink`.
* Adds `configureAndAwait`, a suspending twin of `configure`, plus the `Superwall.isConfigured` flag for ordering calls.

## Notes

* There is no pre-configure call queue: most members throw `SuperwallError.NotConfigured` before `configure`. Guard-exempt members are `handleDeepLink`, the flows, `delegate`, and the introspection properties.
* iOS integration is two steps — the Gradle dependency plus the `SuperwallKMPBridge` Swift package — and the Kotlin framework must be exported as `isStatic = true`, because it does not embed the bridge binary. See the [README](README.md#ios) for details.