Apps similar to Tomato Clock include Pacelock, which is free. Other options are TomatoTimer, Focus Keeper, Madoro and WorkTimer. Pomodoro Timers like Tomato Clock are a crowded field, with more than 25 alternatives for the web, Android, Mac, Windows and Linux.
The basis of Pomo Timer lies technique Pomodoro Technique developed by Francesco Cirillo in the late 1980s. You can read more about the technique on the Wikipedia page.
Russia
ClockAura is a free hub of online timers that work in any browser with no sign-up and nothing to download. It includes a Pomodoro timer with auto-cycling focus and break rounds, countdown timers, a stopwatch, HIIT/Tabata interval timers, an egg timer, a full-screen classroom...
