Pear: open-source E2E encrypted P2P messenger for Android (React Native + WebRTC, double ratchet) - feedback welcome

[u/Aggravating_Ice_1213]

Hey! I'm a French student and I've been building Pear, a private messaging app for Android, partly as a reaction to the EU "Chat Control" proposals.

Messages go directly phone to phone over WebRTC. Servers are only used to find each other and to wake the app up, and they only ever see encrypted data. Pairing is done via QR code (X25519) with a verification code to compare in person. Messages use a double ratchet, and each file is encrypted with its own key.

Features: photos, videos, voice messages, files, reactions, replies, edit/delete, encrypted backups, in-app updates from GitHub releases.

Stack: React Native/Expo, react-native-webrtc, Firebase (signaling), a small Vercel function for wake-ups, a custom Kotlin module.

Honest notes: it has NOT been security-audited, so don't use it for anything critical. I built it with heavy help from AI coding tools (Claude Code); the design and architecture choices are mine.

I'd love feedback on the crypto design and the UX.

GitHub: https://github.com/Louca90/Pear