Author here. Since the "try for free" came up in a few comments and this really ought to be made more prominent but I haven't had the time.

You can try it for free by simply going though with the first step: login with Github and give app necessary permissions. Everything will just work after that. You'll have a few days until the subdomain gets reclaimed into the available pool.

If you pay for subscription even once, even if subsequently you decide to cancel it, subdomain remains yours, links won't break, RSS feed will continue to be served but new hoots won't be fetched until you subscribe again.

Thank you for trying it and git hooting