CipherNotes

byChar0n · Productivity

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8.0

android

AI summary

Minimalist encrypted notes app that keeps everything local on your device. Supports Markdown editing with live preview, secures notes via PIN or biometric lock, and uses AES-256-GCM encryption with PBKDF2 key derivation. No accounts, no cloud sync, no internet permission, and no telemetry. Open source under MIT license.

Generated by AI. May contain inaccuracies.

About this app

Notes. Encrypted. Local. Nothing more.

Why Cipher?

- Your phone is your vault. Everything stays on device. - No accounts. No login. No tracking who you are. - Small footprint. No bloat. - Auditable. Open source. Every line of code visible. - Privacy by design. No internet permission. Zero telemetry hooks.

What it does NOT do

- Cloud sync - Account creation - Analytics - Advertisements - Internet calls (network config enforces it) - Crash reporting - Any telemetry

Privacy by design

- No INTERNET permission in AndroidManifest - Network security config blocks all outbound traffic at OS level - Passwords never stored — derived on-demand via PBKDF2 - Encryption uses: PBKDF2 (200k iterations) + AES-256-GCM - All data stays on device — Room SQLite database

License

MIT

notes encrypted offline open source markdown privacy

What's new

v2.0.0Aug 3, 2026

Security & Privacy Upgrades
App Lock (PIN & Biometrics): Secure your notes with a dedicated PIN or seamless biometric unlock (Fingerprint / Face Unlock). Enhanced App Security: Strengthened local access controls to keep your encrypted data strictly private.
Editor & Content Features
Markdown Support: Write and format your notes using standard Markdown syntax (headings, bold, lists, code blocks, and more). Dedicated Preview Mode: Toggle seamlessly between clean editing and a fully rendered, smooth Markdown preview. Open Source Licenses: Added an Open Source Licenses section in Settings to credit the FOSS ecosystem.
System & UI Enhancements
Android 16 Readiness: Updated target SDK to 36 for maximum compatibility, security, and performance on the newest devices. UI Polish: Visual refinements across the app for a cleaner, more intuitive user experience.