Show dev.to: I launched Quldra - a post-quantum, single-device Signal alternative

Short summary

Quldra is a single-device, end-to-end encrypted messenger using post-quantum cryptography (ML-KEM-768), with no multi-device sync, phone numbers, or cloud backups. Built solo over 8 months by Martin, it prioritizes security over convenience with trade-offs like no typing indicators and recovery wiping message history. The creator argues post-quantum crypto should be default for new messaging apps against long-term privacy threats.

• •Solo-built post-quantum encrypted messenger with single-device enforcement and ML-KEM-768 key exchange
• •Deliberately rejects multi-device sync, cloud backup, and contact discovery to maximize privacy
• •Creator argues post-quantum cryptography should be default for new messaging apps given harvest-now-decrypt-later threats

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