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 focused on secure, decentralized messaging without reliance on central servers, making it ideal for privacy-conscious users. In contrast, Psi offers a more user-friendly experience with multi-protocol support, making it suitable for users who want to integrate different messaging services.