Free utilities for iOS and Android developers. From icon generation to unit conversion — the tools you reach for every week.
Upload a master image and download PNGs for Android launcher sizes, Play 512px, and common iOS icon points — one preset at a time in the browser.
dp and sp to px across ldpi–xxxhdpi, px back to dp, plus pt↔px using a 96dpi reference for quick layout math.
Parse custom schemes and paths; see scheme, host, query, and a starter Android intent:// template you can tailor.
Fill title, body, and optional FCM data lines; copy FCM v1-style JSON plus a minimal APNs aps alert block.
Center-crop and export PNGs for Play phone, feature graphic, and common iPhone/iPad listing sizes.
Paste keytool -list -v or Gradle signing report text; copy SHA-1 and SHA-256 with or without colons for Firebase and Play.
Look up exact splash screen dimensions for every iOS and Android device. Copy the sizes straight into your project config.
Search any Android manifest permission and get its description, protection level, and when to request it at runtime.
Calculate scalable font sizes, padding, and layout values for React Native and Flutter across different screen sizes.
Regex tester, JSON to Pydantic, cron builder, type hints generator, and more free Python utilities.
Browse Python tools →Admin generator, secret key generator, settings checker, serializer builder, and more free Django tools.
Browse Django tools →JSON to TypeScript, CSS to Tailwind, SVG to component, color contrast checker, and more free React tools.
Browse React tools →JSON to Dart, Dart data class generator, hex to Flutter color, pubspec validator, and more free Flutter tools.
Browse Flutter tools →Package.json generator, JWT decoder, Dockerfile generator, .gitignore builder, and more free Node.js tools.
Browse Node.js tools →We build custom developer tooling and internal applications. Tell us what you need.