ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.
v5.0:
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.9...v5.0
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.8...v4.3.9
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.7...v4.3.8
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.6...v4.3.7
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.5...v4.3.6
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.4...v4.3.5
Changelog: https://github.com/chatsecure/chatsecure-ios/compare/v4.3.3...v4.3.4