Huh! Thank you. I’d not heard of Choosy and immediately have multiple uses for it. Opening hooked Basecamp URLs into my Basecamp Fluid app works great.
But I’m curious: does your rule to open https://3.basecamp.com URLs in the Basecamp 3 app actually work? I’ve replicated that rule, but when I trigger a qualifying URL via Hook or Alfred, Choosy activates the Basecamp 3 app, but it doesn’t go to the correct page. It just stays on whichever page was open.