BillDog.io

BillDog gives subscription apps one SDK and backend for in-app purchases, native paywalls, product analytics and messaging, all on a single customer record, instead of stitching together RevenueCat, Superwall, Mixpanel and OneSignal. It handles StoreKit 2, Google Play Billing and Stripe web checkout, verifies App Store and Google Play purchases on the server, and lets you change and A/B test paywalls without an app release. Push, email and in-app messages can be triggered by real trial starts, cancellations or billing issues. SDKs for iOS, Android, React Native, Expo, Flutter and the web, plus an MCP server so Claude or Cursor can query revenue and set up paywalls, with a person approving anything that reaches paying users. In public beta: free under $3,000 of monthly tracked revenue, then 0.5% of it.