Authenticator app
A web-based authenticator with nothing to install. Add a QR code, setup key or backup file to see the code it's generating right now.
Checking the live time…
Your accounts stay in this browser on this computer, and only until you close this page, unless you choose to save a key in your password manager. Nothing you add is sent to this website. This page uses Google Analytics to count visits and goes online to check the time, and neither is given your keys.