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Alien Apps

My own apps – minimal, fully offline, no Google.
No account, no server, no telemetry. Your data stays on your device. Open source on Codeberg · distributed signed via the Nostr Zap Store

App icon: Sachwert-Tresor

Sachwert-Tresor (Hard-Asset Vault)

Encrypted vault for Bitcoin, gold & silver

Your wealth is nobody's business. A local, encrypted vault for your Bitcoin, gold and silver holdings – fully offline. No cloud, no server, no price API reading along. Nothing leaves your device in plain text.

  • AES-256-GCM encryption, protected by your master password
  • Optional two-factor authentication (TOTP)
  • Precious metals as count × unit size – bars and coins tracked cleanly
  • Manual price entry: no data leaking to external price services
  • Cross-device sync via Syncthing – peer-to-peer, no middleman

Full hardening only in the app (v2.0): no INTERNET permission, FLAG_SECURE, no cloud backup – operating-system-level protection the web version cannot offer.

Android / GrapheneOS · open source (MIT) · also as a web version

On the Zap Store Source (Codeberg)
App icon: Ausgaben-Tracker

Ausgaben-Tracker (Expense Tracker)

Minimal, fully offline expense tracker

A budget book without banking-app snooping. Keep an eye on your spending – no account, no server, no tracking. All data stays encrypted on your device.

  • Monthly and annual overview at a glance
  • Fixed-cost management for recurring expenses
  • CSV export for your own analysis
  • AES-256-GCM encryption with master password

Android / GrapheneOS · open source

On the Zap Store Source (Codeberg)
App icon: Alien Fitness

Alien Fitness

Minimal, fully offline workout tracker

A training log that belongs to you. A personal workout tracker – training plans, live logging and progress, without a fitness platform recording your health data.

  • Training plans: strength (Push / Pull / Legs) and HIT (Tabata, Power)
  • Live session logging with automatic rest timer
  • Progress charts per exercise (max weight / reps over time)
  • Exercise library with images, muscle groups and equipment

Android / GrapheneOS · open source · requires login to the Alien Investor fitness backend

On the Zap Store Source (Codeberg)

How to install the apps – without Google Play

All apps are distributed as developer-signed releases – not through the Google Play Store. Easiest via the Nostr Zap Store (cryptographically verified installs, updates through your social graph) or via Obtainium directly from Codeberg – both entirely without a Google account. Learn more: app stores on GrapheneOS and the Nostr Zap Store explained.

All apps listed here are my own open-source works. They run offline, collect no data and are fully source-available. Use at your own responsibility.

See all apps at the Alien Investor Zap Store profile.