01:30
Tip: press Space to start / pause. Screen stays awake while running.
Free swim interval timer online
Time pool sets on a fixed interval. Set 1:30, 1:15, or 0:45, press Start when you push off, and Tickline rings on every rep. Great for laddered 100s, sprint 50s, or steady-state 200s — no watch required.
Frequently asked questions
What is a swim interval timer for?
Repeating pool sets on a clock — e.g. 10 × 100m on 1:30, or 8 × 50m on 0:45. Tickline counts down each interval and rings when the next rep starts.
How do I run a set of 10 × 100 on 1:30?
Set 1:30 as the interval, press Start when you push off, and dive again each time the alarm sounds. Repeat 10 times.
Does it work with a waterproof phone in a bag?
Yes — the alarm still plays and the screen still counts, so a poolside phone in a case works well.
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