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
Bitmessage focuses on decentralized, anonymous messaging, making it suitable for users seeking strong privacy. In contrast, ChatSecure offers a user-friendly experience with features like group messaging and multi-platform support, appealing to those looking for a more conventional chat application while still maintaining a level of security.