On your site you are supposed to have a page for feature requests that you shared to someone else asking you a question - that page doesn't exist.
There should also be a page for your roadmap - https://roadmap.tidycal.com/ - it doesn't exist.

TidyCal seem abandoned. Is it?

Also, what is the difference with the Agency version compared to the other version, except for the more calendar integrations? White labeled URL? Anything else?

Is it possible to configure time and date formats resp currencies?