How can I find the version number of the Trello free version that's running today?

[Carol Ann Brumfield]

I understand that the version can change frequently but just need a baseline.

[Felix]

Curious why you want to know this information?

Trello API requests will return a "x-trello-version" response header - that's the version of our backend. Note that the header is not considered API, so it may change formats, be renamed or disappear entirely at any time, and without public deprecation.

The web client version is set on the window object, and can be queried via "window.trelloVersion" - again, not API, can change anytime.