App Rank Tracker vs Reactive Playground

See exactly where any App Store app sits in the charts — in every country, updated daily. WHAT IT DOES - Live Top 100 chart position in every storefront - Per-country history and trend - Local push the moment your rank moves - Background refresh, no app open needed - 100% on-device. No account. No sign-in. WHO IT'S FOR - Indie devs tracking their own launch - Founders watching competitor charts - ASO managers monitoring category performance Uses Apple's public iTunes chart feeds. No App Store Connect login or API key required.

Reactive Playground is a visual learning app for reactive programming. Instead of reading operator definitions only, you can play with marble timelines directly. Pick a category, open an operator, move events around, edit their values, clone items, remove them, or turn them into errors and completed events. The output updates live so you can understand what each operator really does. Explore operator categories such as: Transforming Filtering Combining Error Handling Utility Each playground shows a source timeline, an output timeline, a short explanation, and a code-style example. It is useful for learning ReactiveX concepts, reviewing operators, or quickly refreshing how a stream behaves before using it in code. Reactive Playground is made for developers, students, and anyone learning Rx-style reactive programming.