HIIT & Interval Workout

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Free Online Interval Workout & Circuit Timer

HIIT & Crossfit Rounds•High-Contrast Digits•Audible Beeps for Reps•No App Install Needed

Crush High-Intensity Workouts with Audio Alerts

Time your exercise intervals without looking at your phone. TimerBox gives you clear countdown visibility and loud audio beeps.

Ideal for circuit training, kettlebell complexes, sprint intervals, and home workout routines.

How to Use the Interval Workout Timer

1

Set your circuit or workout round length.

2

Position your laptop or phone where it is clearly visible.

3

Push through each set until the audible buzzer sounds.

4

Take your prescribed rest and repeat.

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Frequently Asked Questions

Will the screen stay awake during my workout?

Yes. TimerBox automatically engages the HTML5 Wake Lock API to prevent screens from dimming or sleeping.

Ready to Start Your Interval Workout Timer?

Scroll up and press Start to begin your visual countdown immediately.