space start/pause · r reset · f fullscreen
Fifty minutes on, ten minutes off is the other common focus rhythm - closer to how a lecture or a meeting block is scheduled, and a better fit than 25 minutes when a task needs a long ramp-up.
Open this page and press Start, or hit the space bar - the countdown is already loaded with 50 minutes. Press F for fullscreen if you want to read it from across the room, and use the custom field to switch to any other duration.
Yes. The countdown is calculated from a fixed end time rather than counted tick by tick, so background throttling cannot make it drift. The remaining time also appears in the browser tab title while you work in another tab.
Yes, it chimes three times and the clock turns red. The last ten seconds blink as a warning, and the chime can be muted with the speaker button.
Yes, it is completely free, needs no account, and runs entirely in your browser - nothing is sent to a server.