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 focused on privacy and decentralization, offering strong encryption and anonymity, making it suitable for secure communications. In contrast, Telegram provides a feature-rich platform with a large user base and additional functionalities but raises privacy concerns due to its corporate ownership.