Cryptocat is described as 'Open source. All Cryptocat software is published transparently. Encrypted by default. Every message is encrypted, always. Forward secure. Chats are safe even if your keys are stolen. Multiple devices. Devices receive messages even when offline'. There are more than 25 alternatives to Cryptocat for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is Signal, which is both free and Open Source. Other great apps like Cryptocat are Element (Free Personal, Open Source), Jitsi (Free, Open Source), Tox (Free, Open Source) and Matrix.org (Free, Open Source).
Signal is a messaging app with an unexpected focus on privacy, combined with all the features expected from a modern IM app. Signal has received a lot of praise from all around the world for its security and privacy-respecting technologies.
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Almost everyone thinks Signal is a great alternative to Cryptocat.
Element is a secure collaboration and messaging app based on the Matrix protocol. It’s decentralised to deliver digital sovereignty, and based on an open standard for easy connections and interoperability. It is end-to-end encrypted by default.
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
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Most users think Jitsi is a great alternative to Cryptocat.
Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of servers with no single point of control.
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption. Why Wire?
Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement Open Source and cross-platform. Jami gives you a full control over your communications and an unmatched level of privacy.
An open-source decentralized and encrypted messaging app even without internet connection via Wi-Fi and Bluetooth. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access is required.