Bitmessage is a decentralized, encrypted, peer-to-peer, trustless communications protocol that can be used by one person to send encrypted messages to another person, or to multiple subscribers.
License: Open Source
Bitmessage is a decentralized, anonymous messaging platform that prioritizes privacy and security, while Threema offers a more user-friendly experience with end-to-end encryption and self-destructing messages. The choice between the two depends largely on the user's preference for decentralization versus ease of use.