ChatSecure is a messaging application for iOS which allows OTR and OMEMO encryption for the XMPP protocol. Developed by Chris Ballinger and The Guardian Project
License: Open Source
ChatSecure is best for users who prioritize anonymity and are comfortable with XMPP protocols, while Signal offers a more user-friendly experience with robust features like video calls and self-destructing messages. Overall, Signal is more versatile and widely adopted, making it a better choice for general communication needs.