Off-the-Record Messaging (OTR) is a cryptographic protocol that provides encryption for instant messaging conversations. Developed by Ian Goldberg and the OTR Development Team
License: Open Source
Off-the-Record Messaging is focused on providing secure one-on-one messaging with no logs, while ChatSecure offers a broader range of features including group chats and integration with the XMPP protocol. Both prioritize privacy and security but cater to slightly different use cases.