I'm using Little Snitch auto profile switching for that. Not as pretty and a little more complex, but does the job and a lot more.
Last time I tried Little Snitch, setting it up to make it work like TripMode was a world of pain. Good to see they have improved in that area, will definitely take a look : )
They probably haven't improved, I just don't find it painful enough to introduce another tool :)
Great idea for a product, the website's execution seems really lazy.
I've been looking for an app like this for ages: basically, it detects when you're using a mobile hotspot and blocks all unwanted internet traffic (iCloud / Dropbox / etc…) so you don't end up using all your data plan in 15 minutes by inadvertently downloading a software update or syncing your iCloud Photos.
Clever. Instabuy : )