BitChat vs Cyph

BitChat is a decentralized messaging app that uses Bluetooth mesh for nearby communication and Nostr relays for internet messaging. Bluetooth messages can pass between nearby devices across as many as seven hops without internet access. When Bluetooth is unavailable, the app can use Nostr; if neither route is available, messages can wait in a queue. Geographic chat rooms use geohash coordinates.

The app requires no account, phone number, or central server. Live mesh sessions use Noise XX for mutual authentication and forward secrecy, while private Nostr messages use an app-specific encrypted format that works only with BitChat clients. However, mesh announcements expose static keys and nicknames in cleartext, and a persistent per-device identifier can allow nearby listeners to follow a device over time and place. A triple-tap emergency wipe clears app data, including identity keys and queued messages. Android adds Wi-Fi Aware on supported devices and built-in Tor. BitChat is available for iOS, Android, and macOS, and is free.

Cyph is a privacy-focused messaging and social networking service for secure conversations, video meetings, and encrypted storage. It offers private instant messaging, encrypted group video calls, and scheduled meetings. Cyph Vault stores files, passwords, notes, cryptocurrency, and other data in encrypted cloud storage. The service is available on Android, iOS, Linux, macOS, web, and Windows, including a browser app that needs no download. Cyph says WebSign checks the integrity of its web application each time it opens, and that multiple quantum-resistant ciphers protect data against future quantum-computing advances. It also says it automatically helps prevent impersonation without requiring manual fingerprint verification. The site reports that a Cure53 security audit found no major issues in application security or cryptographic implementations. Cyph Telehealth adds live group sessions, unlimited patient sessions, one-click onboarding, and secure notes, forms, and history. It describes Telehealth as beyond HIPAA-compliant and says it includes a BAA. Cyph has a free plan; paid pricing starts at $3/mo (annual).