Client SDKs — one API, every platform

These are the kits a customer drops into their app to sell subscriptions with SubSovereign — receipt validation, entitlements, paywalls and the EU withdrawal right, on every major platform. Each SDK is generated from a single API specification via Rosetta, so all 8 stay in lockstep.

iOS / tvOSSwift

Swift Package Manager / CocoaPodsimport SubSovereign

StoreKit 2 receipts, entitlements, paywalls, EU withdrawal.

Android / Fire TVKotlin

implementation("com.subsovereign:sdk:1.0.0")import com.subsovereign.sdk.SubSovereign

Play Billing + Amazon Appstore validation, entitlements, paywalls.

JavaScriptTypeScript

npm i @subsovereign/jsimport { SubSovereign } from '@subsovereign/js'

Framework-agnostic core client for any JS runtime.

Web ComponentJS / Custom Element

npm i @subsovereign/web<subsov-paywall app-id="…">

Drop-in <subsov-paywall> element — no framework required.

ReactTypeScript

npm i @subsovereign/reactconst { hasAccess } = useSubSovereign()

Hooks + components for entitlements and paywalls.

React NativeTypeScript

npm i @subsovereign/react-nativeimport { SubSovereign } from '@subsovereign/react-native'

iOS + Android in-app purchases from one RN codebase.

FlutterDart

flutter pub add subsovereignimport 'package:subsovereign/subsovereign.dart';

Cross-platform entitlements, purchases, paywalls, withdrawal.

RokuBrightScript

Copy the SubSovereign component into your channelm.subsov = CreateObject("roSGNode", "SubSovereign")

Roku Pay validation + entitlements for channels.

Amazon Vega OSTypeScript / Kepler

npm i @subsovereign/vegaimport { SubSovereign } from '@subsovereign/vega'

Fire TV’s successor runtime — entitlements, paywall and EU withdrawal on Kepler.

Generated by Rosetta

Rather than hand-maintaining eight separate SDKs, one OpenAPI specification is compiled into all of them (plus an MCP interface for AI agents) by Rosetta — our sovereign code generator. Change the API once; every SDK regenerates in step.