OnionCanary Online Tools
http://5mmxbvvr2mfkixu7kpsf5f453kpa3x5ypah5tq4f4it7bkryw2ykasad.onion
4.4s
Publish a PGP-signed statement on a schedule. Miss a check-in and the page flips to a warning by itself — a canary nobody has to remember to update is not a canary.