Every second counts. AlarmTimer
Timer, stopwatch and exact time — free, no sign-up.
✓ Rings on time in background tabs✓ No sign-up, nothing to install✓ Nothing you type leaves your device
Timer05:00Rings on time even in a background tab. Fullscreen and presetsOpen →
Stopwatch00:00.00Hundredths of a second, laps and splits, fastest and slowest lapOpen →
Exact Time--:--:--Your local time to the millisecond, and how far off your clock isOpen →
Pomodoro25-minute focus, 5-minute break, on repeat. Study timer
World ClockCurrent time in cities worldwide and a meeting planner
CountdownDays, hours, minutes and seconds to any date. Shareable linkWhich tool do I need?
- Tell me when time is up → Timer (cooking, class activities, presentations)
- Record how long something takes → Stopwatch (running laps, test practice)
- Study or work in focused blocks → Pomodoro timer
- Call or meet across time zones → World clock & meeting planner
- Is my clock right? → Exact time
- How many days until… → Countdown (exams, trips, New Year)
What makes AlarmTimer different
It stays on time in background tabs. Browsers slow down tabs you aren't looking at, so many web timers ring late while you do something else. AlarmTimer calculates from the finish time and schedules the alarm on your device's audio clock the moment you press start.
It checks your clock. The clock on the card above is your device clock. Device clocks are off by seconds more often than you'd think, so Exact Time compares yours with an internet time server and shows the corrected time with an honest error margin.
No personal data. There are no accounts; settings and records stay in your browser.