Interval timer
Alternate work and rest rounds without installing an app.
00:30
Popular timer lengths
One click sets a countdown for cooking, workouts, study, meetings, classrooms, breaks and presentations.
15 Minute Timer
A clean 15-minute countdown for focus, breaks, meetings, cooking, exercise, study and classroom activities.
00:00.0
Ready
25:00
Focus session
Session
Quick share
Copy a link that opens with your current countdown already set.
Local & private
No account and no remote timer state. Your countdown runs on this device.
Runs on this device
About this {name}
This 15-minute timer opens ready to start. It calculates remaining time from the target finish timestamp, so browser scheduling delays do not make the countdown slowly drift.
Accurate timing without unnecessary setup
The interface stays simple while the timer handles browser throttling, local alerts and optional device capabilities.
Corrects background-tab delay
Remaining time is recalculated from the target finish time, so a delayed tab catches up instead of drifting.
Runs locally
No account or remote timer state is required. Preferences stay in local browser storage until you clear them.
Does the timer stay accurate in a background tab?
Yes. It uses a target end time, so remaining time corrects itself after browser scheduling delays.
Can I use it offline?
Yes, after a supporting browser has cached the core app files during an online visit.
How do shareable timer links work?
The duration is encoded in the URL, such as ?t=300 for five minutes. No server-side timer state is created.