Philipp Jahoda
A chart library trusted by thousands of Android apps, a screenshot tool for macOS built for AI agents, an interval timer and an expense tracker for iPhone.
Open source · Android
The chart library for Android. Line, bar, pie, scatter, candlestick, bubble, radar and combined charts with zooming, dragging, highlighting, markers and animations. Written in Kotlin, with a Jetpack Compose module, and used in tens of thousands of apps.
App · macOS
Capture, annotate, done. A fast screenshot tool with a clean editor, scrolling capture and text recognition. Its built in MCP server lets Claude Code, Claude Desktop, Codex and any MCP client take, read and annotate screenshots on your terms: you approve each agent once, and every action shows a notice.
App · iPhone
Interval training without the fiddling. Set work, rest, sets and rounds, then hit start. Numerals you can read across the room, a haptic tap on every change, templates for the workouts you repeat, and a weekly streak that keeps you honest.
App · iPhone
Know your budget. Tap plus and type the amount, tell Siri, or point the camera at a receipt. Monthly overviews, budgets that warn early, statistics per category and iCloud sync, with your data staying on your device.
Smaller libraries and experiments live on github.com/PhilJay, including JWT, a Kotlin JSON Web Token implementation for Apple push notifications and Sign in with Apple.