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
Wickr offers a user-friendly experience with strong encryption, self-destructing messages, and support for voice/video calls, making it suitable for secure communication. In contrast, Off-the-Record Messaging is an open-source option that emphasizes anonymity and session-based messaging but lacks some advanced features like voice calls and self-destructing messages.