Pomodoro App

I'm looking for a full-featured, lightweight Pomodoro timer. Not having much luck in the app store for various reasons. Some only have 25/5 cycles (My ideal is 50/10 and I need to work up to that), another wouldn't work with my headphones, another wouldn't alarm until the screen was turned on(???). At this point it's just easier to use my default phone's timer, but that's less than ideal since I have to manually set and adjust the timer and the whole point is to get into an uninterrupted flow for 2-4 hours at a stretch.

I'm predicting a FOSS alternative to that paid/freeby garbage will have the features i need with no bullshit on top. Help?