Countdown Timer
Set a custom countdown in seconds or minutes with a visible progress indicator and optional sound.
Play Countdown Timer
Enter a duration, start, pause or reset the countdown.
How to play Countdown Timer
Enter a duration, start, pause or reset the countdown.
How results are calculated
Remaining duration calculated against a monotonic browser clock.
Accuracy, limitations and fair comparisons
Browser tabs cannot promise OS-level background alarms. The challenge runs in your current browser session; compare repeated attempts on the same device for a more useful personal reference.
Questions and answers
Is Countdown Timer free?
Yes. This activity is free and does not require registration.
Does this test upload my input or score?
No. Gameplay and optional history storage run in your browser on this device; exporting a result requires your own action.
What is the measured result?
Remaining duration calculated against a monotonic browser clock.
Can the result be treated as a medical or hardware diagnosis?
No. Browser tabs cannot promise OS-level background alarms.
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