Around 5 years ago I wrote something very similar, for the same reasons as you. It was never intended to be more than a proof of concept, but I've ended up using it most every day.

Mine is web based, but all implemented in the front-end; no data is ever sent to the server.

I was debating whether to post the URL, because I don't really want a bunch of people to start depending on it the way I do (I have zero plans to maintain/improve it). But I feel like there may be sufficient interest. So the URL is in my profile for the next 48 hours.