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Development
BLOS Desktop
Year: 2025Technology: Electron, SQLite3, Node.js, Vanilla JS, Bcrypt.js
Offline-first Electron desktop client with local SQLite storage and a bidirectional sync engine for ministry outreach in low-connectivity field environments.
SQLite
Local-first
30s
Sync interval
Electron
Cross-platform
Overview
BLOS Desktop is a production-grade Electron application that solves unreliable internet connectivity during field outreach. It uses a local-first SQLite architecture for zero-latency operations and a bidirectional sync engine that silently reconciles data with remote servers when connectivity returns.
Bidirectional Sync Engine
- Automatic push of dirty records upon internet detection
- Scheduled pull updates every 30 seconds
- Last-write-wins conflict resolution with timestamp-based synchronization
- Secure
/push.phpand/pull.phpAPI integration
Offline-First Architecture
- Full functionality without internet via better-sqlite3 local storage
- JSON serialization for complex record structures
- Buffered sync queues for high-volume batch data entry
- Data persistence across app restarts
Security & Distribution
- 64-character hex SYNC_API_KEY authorization and bcryptjs encryption
- Unique Machine ID per instance for multi-PC synchronization
- Electron-builder native installers for Windows, Mac, and Linux
Conclusion
BLOS Desktop extends the web-based outreach system into a native, offline-capable field tool — ensuring no registration is lost regardless of connectivity conditions.
