Frequently Asked Questions
Is QryptChat free?
Yes. QryptChat is free and open source under the MIT license. All core messaging, calling, and encryption features are available at no cost, and you can self-host it. An optional paid Premium tier is in development.
What platforms does QryptChat run on?
QryptChat runs in any modern web browser and installs as a Progressive Web App on Android, iOS, and desktop. It is also reachable as a Tor hidden service.
What makes QryptChat quantum-resistant?
QryptChat encrypts messages, files, and calls with NIST-approved post-quantum algorithms: ML-KEM-1024 (CRYSTALS-Kyber) for key encapsulation and CRYSTALS-Dilithium for digital signatures. These protect against "harvest now, decrypt later" attacks where traffic recorded today is decrypted once quantum computers exist.
How is QryptChat different from Signal?
Like Signal, QryptChat offers end-to-end encrypted messaging and calls with phone-number sign-up. The key difference is that QryptChat uses post-quantum cryptography (ML-KEM-1024 and CRYSTALS-Dilithium) by design, is MIT-licensed and self-hostable, and is accessible over Tor.
Does QryptChat require an email address or password?
No. You register with a phone number and a one-time SMS verification code. There is no password to leak and no email address to collect.
Can I self-host QryptChat?
Yes. QryptChat is open source and self-hostable. The full source code is available at github.com/profullstack/qryptchat-web.
Can QryptChat read my messages?
No. Encryption keys are generated on your device and never sent to our servers, so QryptChat operates on a zero-knowledge basis and only ever handles ciphertext.