ChatSecure is a messaging application for iOS which allows OTR and OMEMO encryption for the XMPP protocol.

ChatSecure has been used by international individuals[5][6] and governments,[7] businesses,[8] and those spreading jihadi propaganda.

[11] ChatSecure was originally released in 2011, and was the first iOS application to support OTR messaging.

ChatSecure iOS remains in active development and is unaffected by this change.

[18] In November 2014, "ChatSecure + Orbot" received a perfect score on the Electronic Frontier Foundation's "Secure Messaging Scorecard";[19] the combination received points for having communications encrypted in transit, having communications encrypted with keys the provider doesn't have access to (end-to-end encryption), making it possible for users to independently verify their correspondents' identities, having past communications secure if the keys are stolen (forward secrecy), having the code open to independent review (open source), having the security designs well-documented, and having a recent independent security audit.