Open-source, end-to-end encrypted messaging platform built with military-grade cryptography.
Guardyn puts privacy first with cryptographically-verified security, reproducible builds, and self-hosted infrastructure. Built by privacy advocates, for privacy advocates.
- 🔐 End-to-End Encryption: X3DH key exchange + Double Ratchet protocol (Signal Protocol)
- 👥 Group Messaging: OpenMLS implementation (IETF RFC 9420) for secure group chats
- 🏠 Self-Hosted: Full control over your data and infrastructure
- ✅ Reproducible Builds: Built with Nix for verifiable, deterministic builds
- ☁️ Kubernetes-Native: Production-ready deployment with TiKV, ScyllaDB, NATS JetStream
- ✅ Backend MVP Complete: All core services implemented and tested
- ✅ 8/8 E2E Tests Passing: Comprehensive integration tests
- 🚧 Mobile Client: Flutter app in active development (Q4 2025)
- 📋 Security Audit Planned: Professional audit by Cure53 (Q2 2026)
- guardyn/guardyn — Main repository (Backend, Infrastructure, Docs)
- guardyn/.github — Organization profile and community files
- 🌐 Website
- 📖 Documentation
- 💬 Discussions
- 🐛 Issue Tracker
- 🐦 Twitter/X
Contribute code:
Financial support:
- GitHub Sponsors — Help accelerate development
- All options — Crypto, Ko-fi, Open Collective
Built with 🔐 by privacy advocates, for privacy advocates.
