Quldra
quldra.comYour messages, secured against tomorrow's threats.
Securitypost-quantumend-to-end-encryptionmessagingprivacyml-kemsignal-alternativemobile-app
About
Quldra is a post-quantum encrypted messaging app available on iOS, Android, and in the browser. Private keys are generated and stored on-device only, no phone number is required, and all encryption happens client-side before messages are transmitted. It supports direct messages, group rooms, media sharing up to 200 MB, and guest browser sessions for non-app users.
Problem
Conventional messaging apps use cryptography vulnerable to future quantum computers and often monetize user data through ads or metadata harvesting.
For
Privacy-conscious individuals, small teams, and enterprise organizations seeking secure messaging
How it works
Quldra encrypts all messages on-device using post-quantum algorithms (ML-KEM-768, ML-DSA-65, ChaCha20-Poly1305) before transmission through its relay servers, which only see encrypted payloads and cannot read message content.
Business model
freemium
Status
launched