Ask HN: Is there a time tracker that will pop up?

I'm looking for an app to track how I use my time at my PC, but annoyingly can't find the thing I'm looking for.

I don't want the RescueTime approach of just tracking apps, because I use text editors, say, for a lot of different things. And I don't want the type of time tracker that you have to manually change task on, because I'll never remember.

What I'm looking for is something that'll pop up a brief question every 15 minutes or so about what I'm doing - I answer that and go back to work.

I know there are such things for iOS and Android, but is there one for Windows?

I'd hope I could customise the question, and thus what activity was tracked :)

I'm looking for something like http://last5.co/, but not terribly, terribly buggy :)