English | 简体中文

End-to-end encrypted note synchronization — AES-256 encryption, 12-word mnemonic recovery, real-time collaboration via WebSocket.

• E2E Encryption — AES-256-GCM, keys never leave the client
• Mnemonic Recovery — BIP39-style 12-word seed phrase for key backup
• Real-Time Sync — WebSocket-based instant synchronization
• Offline Support — Local-first with conflict resolution on reconnect
• Markdown Editor — Rich text editing with live preview
• Multi-Device — Sync across browsers/devices via mnemonic

• Frontend: React 18 + TypeScript + Tailwind CSS
• Backend: Express + Socket.IO
• Encryption: Web Crypto API (AES-256-GCM)
• Storage: IndexedDB (client) + SQLite (server)

# Install dependencies
npm install

# Start development
npm run dev

# Build for production
npm run build

1. Generate or Import a 12-word mnemonic phrase
2. Derive encryption key from mnemonic using PBKDF2
3. Create/edit notes — encrypted locally before sync
4. Real-time sync — encrypted blobs transmitted via WebSocket
5. Multi-device — import same mnemonic on another device to decrypt

• Keys derived client-side from mnemonic, never sent to server
• Server only stores encrypted blobs — zero-knowledge architecture
• AES-256-GCM with unique IV per encryption operation

MIT License