Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.

RevenueCat - In-app subscriptions made easy

Uilicious Snippet - Free testing platform to replicate & share website bugs 🐞

RevenueStory - Subscription analytics built on top of your billing system

DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more

Apple - Available on iOS