Superfocus
If you want the best pomodoro timer, decide what “best” means: smallest UI, sound included, phone lock, or tasks plus reports. Volume sits on “pomodoro timer” (~90k US/mo) not on brand names.
Minimal web timers
Pomofocus-style pages are excellent if you only need 25/5. They are weak if you also need a study timer, task list, and cassette in one place.
Timer plus atmosphere
Apps that mix lofi and a clock reduce tab sprawl. Superfocus is in this group: browser pomodoro, tasks, Todoist, analytics, $1.99/month.
Phone lock / Forest
Forest is a metaphor, not a desktop deep-work environment. Use it on mobile; use a real focus timer on the computer where the work is.
How to pick in 10 minutes
Run one session in a minimal timer and one in Superfocus. Keep the one where you did not open a third app for music. Then subscribe only if you will actually reopen it.