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 primarily focused on providing secure text-based communication with strong anonymity, while Tox offers a wider range of features including voice and video calls in a decentralized environment. Both prioritize privacy, but Tox is more versatile in terms of communication options.