EverLink: Offline Chat & SOS - Sell Project

EverLink is a complete Android messaging app (Flutter) with a Node.js relay server. It combines end-to-end encrypted chat and calls with peer-to-peer mesh networking, so people can still reach each other when mobile data or Wi-Fi is unavailable. What the app does: End-to-end encrypted messages and calls (ChaCha20-Poly1305, Ed25519/X25519), always on. Mesh messaging: nearby phones relay sealed messages for each other, with relay rules (hop limit, pause on low battery) and a live mesh dashboard. Direct messages, voice calls (WebRTC) with call history, contacts and favourites. Add contacts by QR code, with key fingerprints for identity verification. Emergency SOS: hold to alert nearby phones, "I am safe" follow-up, SOS history. It does not contact official emergency services, and the app says so. Nearby discovery over Bluetooth, and public local rooms (not encrypted, posts expire after 24 hours). Smart network selection between Internet, Wi-Fi, cellular, Bluetooth, Wi-Fi Direct and mesh. Network map (topology and map view) and offline vector map packs. Privacy tools: panic wipe, quick panic trigger, hide app in screenshots and recents, app lock, optional read receipts. Included in the sale: Full Flutter source code (about 41,000 lines of app and server code, plus 78 test files) and Node.js relay server source. README and setup documentation. 12 store screenshots and a demo video. Google Play app transfer once the app is live in production (it is currently in closed testing). Current status: Pre-revenue. No ads or purchases earning money yet. Secrets scan completed: no API keys or credentials in the source. Signing keys are not included in the package; the buyer creates their own upload key. Running costs: none required. No Firebase, ads or paid APIs. Mesh, nearby messaging, SOS and offline maps work without a server. The Internet relay and voice TURN server are optional and hosted by the buyer. Suits developers or startups who want a secure, off-grid messaging product without building the mesh, encryption and call stack from scratch.