BitChat vs Kontalk
BitChat
bitchat.free
Kontalk
kontalk.orgSide by side
| Figure | BitChat | Kontalk |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| macOS | Yes | — |
| iOS | Yes | — |
| Android | Yes | Yes |
| Plans published | 1 | 1 |
| Spec score · Encrypted Messaging Apps | 8.9 (#1) | 7.2 (#34) |
| Encryption | The project describes Noise Protocol end-to-end encryption for mesh messages and BitChat private envelopes for Nostr fallback messages. | The site says client-to-server and server-to-server channels are fully encrypted, and servers cannot decrypt end-to-end encrypted messages. |
| Open source | The iOS/macOS project and Android project state that they are released into the public domain. | The site says all software used in the network, including both server and client software, is open source. |
| Platforms | The maker's site lists iOS, macOS, and Android builds; iOS requires version 16.0 or later, macOS 13.0 or later, and Android 8.0 or later. | The network site says Kontalk is available for Android and desktop. |
Plans
In their own words
BitChat
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.