Cryptocat is an open source web and mobile application intended to allow secure, encrypted online chatting. Cryptocat uses end-to-end encryption and encrypts chats on the client side, only trusting the server with data that is already encrypted. Cryptocat is offered as an app for Mac OS X or as a browser extension for Google Chrome, Mozilla Firefox, Apple Safari, Opera and as a mobile app for iPhone.Cryptocat's stated goal is to make encrypted communications more accessible to average users.