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 focuses on privacy and security with end-to-end encryption and decentralized communication, making it ideal for users concerned about surveillance. In contrast, Riot.im offers a more comprehensive feature set, including multimedia support and integrations, appealing to users seeking a versatile communication platform.