Why I built this
I have never been able to concentrate on one thing for long.
It was never for lack of interest. I would sit down, start, drift off, and an hour later have little to show for it.
The Pomodoro technique was the first thing that changed that for me, because it takes the decision away from me: the timer says when I work and when I stop, and I stopped having to negotiate with myself about it.
What the existing timers were missing was the part that actually protects a session. Starting one means two more things for me every time: turn on a Focus mode so nothing interrupts, and start the music I concentrate to. Two steps at the beginning, two at the end, and every one of them a chance to drift off again. So Tomatino does both itself, and undoes them when the break starts. It brings along what it needs for the Focus part.
25 or 50 minutes?
Take 25 minutes when starting is the hard part
When you keep putting the task off, when you are tired, when the work is small-grained: email, admin, tidying up. The short block lowers the hurdle. Half an hour is over before the resistance kicks in properly. This is also the length to start with if you have never worked this way.
Take 50 minutes when the work needs a run-up
Programming, writing, design. Anything where you spend the first ten minutes just getting back into where you were. 25 minutes is barely enough to get properly into the problem before the timer goes off, and every interruption costs you that run-up again.
Make it longer if you are annoyed when the timer rings
because you were finally in it.
Make it shorter if you feel resistance before you even
start.
Tomatino offers 15 to 90 minutes, and the Timer tab shows what a full cycle adds up to before you commit to it.