Cronômetro Online, com Voltas e Tela Cheia

Field notes

The stopwatch records both split and cumulative lap times and offers four display precisions, from whole seconds through three decimal places. Its fullscreen mode is explicitly designed for shared visibility, including projected classroom or group activity use, and the page says the running session and preferences persist in the browser. The site also routes users to countdown presets from 30 seconds through two hours and to an interval timer for alternating effort and rest.