Google developed its Chrome web browser based on an open-source Chromium engine. The browser undergoes series of tests before if any update is rolled out for the main client; thus, google chrome has about four different versions, namely: canary, dev, beta, and stable. Canary is specially meant for developers to use and give feedback about the new features and functions of the browser before being rolled out for all users. This version of Google Chrome browser is liable to be unstable, as well as possible to break down completely; this is because it is the first version that receives untested features before the dev and beta version, after which the stable version will now receive the tested and proven features/functions.
For testing purpose
Also, it is good to note that, not all the features found on this version of the Google Chrome browser (Canary) will be officially rolled out as updates to the stable version. This is because, Google will discontinue most features reported by Canary users, as well as Chrome beta users. However, this version allows developers to test-run cutting-edge web platform APIs; the truth is, asides from the stable version of Chrome, all other versions are meant for developers of different aspects and levels.
Google Chrome Canary is licensed as freeware for PC or laptop with Windows 32 bit and 64 bit operating system. It is in browsers category and is available to all software users as a free download.