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.
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What is Pomo Timer?
In the basic version, the technique offers to set the pomodoro timer for 25 minutes, a short rest for 5 minutes after each ponodoro and a long rest for 25 minutes after each 4th pomodo. Those who do not fit such time intervals, can at any time change them in the application settings on the General tab