For me, a simple mobile app or properly optimised mobile web view would be hugely valuable for quickly checking in on experiment performance while commuting or away from my desk. Being able to review high level reporting at a glance would make it much easier to stay on top of things.

It would also be particularly useful to pause experiments on the go. I know this is technically possible by logging in on mobile, but the current UI feels quite clunky and not very mobile friendly. Having a streamlined, touch optimised experience for quickly pausing an experiment at short notice, especially when I do not have access to a desktop, would make a real difference.