But the key thing here for me is "Every sandbox boots your app on a live URL." Cursor doesn't easily have that, and that's what would allow me to ditch my local env entirely - the ability to actually try out a PR without needing to check it out locally.
So on that note: how does that work? We've had trouble with getting our dev env running in other cloud envs because it requires a few things (clickhouse, localstack, pg, etc) running which we manage via docker compose locally.
Also, some minor pricing feedback: it'd be really great if there were a version with pay-as-you-go and a cheaper fixed cost. I think your 99/seat/mo model is fine for professional work, but it's a lot to commit to for personal work.