Show HN: BlindFlag – Double-blind dealbreaker test via client-side PSI

Category: other

Tags: privacy, psi, relationship, cryptography, web-app

Score: 5.0/10 (Innovation: 6, Technical: 5, Documentation: 4, Utility: 4)

BlindFlag is a web app that enables couples to privately compare dealbreakers using client-side Private Set Intersection (PSI), revealing only a binary compatibility signal. It combines cryptographic privacy with a paid reveal feature, targeting relationship compatibility checks.

Target audience: end users in relationships, privacy-conscious individuals

Repository: https://blindflag.com

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