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Dev tools · January 17, 2017

ChatSecure iOS v4.0 – OMEMO and Signal Protocol

Free and open source encrypted chat for iOS.

ChatSecure iOS v4.0 – OMEMO and Signal Protocol launched on January 17, 2017 with 107 votes, #386 of 3,670 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 9 years on.

Visit chatsecure.org ↗Alternativestop 11% of January 2017

In plain words

ChatSecure is a free and open source encrypted messaging app for iOS that uses OMEMO encryption and Signal Protocol technology. It is designed for users who want secure communications on mobile devices. Version 4.0 introduces OMEMO encryption, a mobile-optimized encryption scheme that improves upon older OTR technology by allowing users to start secure sessions even when contacts are offline, addressing key usability limitations of previous approaches.

written from the facts on this page · September 2026

From the sources

We’re excited to announce the release of ChatSecure v4.0, our largest step forward in usability since the addition of push messaging six months ago. The most significant new feature is OMEMO Encryption , a mobile-friendly encryption scheme pioneered by Conversations that adapts Signal Protocol to the XMPP world. Using OTR on mobile has always been problematic because it was designed for desktop computers and synchronous conversations. For example, if you don’t have an active OTR session, you can’t start a new secure session if your contact is offline. Even if you do have an OTR session, it can go stale if one of the sides is purged from RAM due to low memory. This can lead to messages that…from chatsecure.org

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