Work timer

/tools/work-timer

Why this one is accurate

A browser throttles a background tab. Chrome cuts timers to once a minute, and Firefox and Safari impose their own floors, so a timer that counts ticks is simply wrong once you switch away.

This one records the wall-clock instant your interval ends and runs its countdown inside a worker thread, which is not throttled the same way. Switch tabs, sleep the machine, come back an hour later: the number is right, and the alarm still fires on time.

Alerts

The usual complaint about focus timers is that the session ends and nothing happens, because a notification was silently blocked. This alerts on five channels at once: a synthesised tone, a desktop notification, the tab title, the favicon, and a full-screen takeover you have to dismiss. Kill any one of them and you will still notice.

Privacy

Everything runs in this page. No account, no network request, and nothing about your sessions leaves the machine. Your settings are remembered in local storage under systrex-timer, and clearing your site data removes them.