FastPDF: Merge & Compress PDF
Tools · Android
Merge, sign, compress and split PDFs offline. Fast, private, no size limit.
100% offlineNo size limitNo upload
// apps
Apps that just work
Small, focused Android apps that work offline, need no account and keep your data on your device. iOS versions are in App Store review.
WortFlow: German Flashcards
Education · Android
Offline German A1–B1 vocabulary with spaced repetition and colour-coded der/die/das.
A1–B1Spaced repetitionOffline
DeepFocus – Pomodoro Timer
Productivity · Android
A minimalist Pomodoro timer for deep focus, studying and productivity.
25 / 5 PomodoroNo accountMinimal
// principles
How I build them
Offline first
Every core feature runs on your device. No connection, no waiting.
Your data stays yours
No account, no sign-in, no cloud sync. Your files and progress never leave the phone.
Light and focused
Each app does one job well, with a clean interface and low battery use.