The Canary Watch site is the work of the EFF, the Berkman Center for Internet and Society, and NYU's Technology Law and Policy Center and it works on a simple concept. The site maintains a list of all of the known warrant canaries and periodically checks each organization's site to see whether the canary is still there and then lists any changes to the status. Right now, Canary Watch lists 11 organizations, including Lookout, Pinterest, Reddit, and Tumblr.
"Canarywatch lists the warrant canaries we know about, tracks changes or disappearances of those canaries, and allows users to submit canaries not listed on the site. For people with interest in a particular canary, the site will show any changes we know about," Nadia Kayyali of the EFF said in a blog post.