Free browser timer
Interval Timer for Work and Rest Rounds
A flexible work/rest interval timer for training, mobility, studying, breathwork, and repeatable productivity sessions. Built for people who need repeatable timed rounds without installing an app, with no account required to start.
People searching for an interval timer want a flexible work/rest loop they can adapt to exercise, studying, breathing, or mobility.
Why this interval timer?
- Simple repeated rounds
- Preset can be adjusted before starting
- Local-only by default
Round 1 of 10
Work
Intervals preset · 20 stages · 10:00 total
0% complete
Zen mode keeps controls thumb-friendly and uses the full phone screen with dark/light focus themes.
Round 1
Work
0:45
Round 1
Rest
0:15
Round 2
Work
0:45
Round 2
Rest
0:15
Round 3
Work
0:45
Round 3
Rest
0:15
Round 4
Work
0:45
Round 4
Rest
0:15
Local timer history
Keep lightweight session receipts in this browser, then export them when you are ready to turn timers into time logs.
How to use this timer
- 1
Choose your work/rest ratio
Use the default 45/15 split for general rounds, or switch to Tabata or custom timing if your routine needs it.
- 2
Prepare your station
Line up equipment, notes, or exercises so you are not rebuilding the routine mid-session.
- 3
Start the first round
Treat each work interval as a clean rep and each rest interval as a reset.
- 4
Review the completed session
Use local history or CSV export if you want to compare interval volume over time.
Best for
Pro tips
- For beginners, keep the work interval short enough that the last round still looks clean.
- For studying, use rest intervals to stand up instead of checking social feeds.
- If the routine has several different stages, start with the custom timer path after this preset.
Use this timer for
Direct answer
What is this interval timer best for?
An interval timer repeats work and rest stages so you can follow a routine without watching the clock. FlexTimer is useful for exercise rounds, mobility, breathwork, studying, and any browser-based sequence where the same timing pattern repeats.
Reviewed and updated 2026-05-25 for browser timer UX, indexable content depth, and structured data clarity.
Recommended timer formats
| Format | Timing | Use case |
|---|---|---|
| General intervals | 45 sec work / 15 sec rest | Circuits, mobility, and mixed routines |
| Equal rounds | 30 sec work / 30 sec rest | Skill practice or moderate conditioning |
| Study rounds | 50 min work / 10 min rest | Long productivity blocks |
Which timer should I use?
Interval timer
Best for: Flexible repeated rounds
Use when you need a work/rest loop that is not locked to Tabata.
Tabata timer
Best for: 20/10 conditioning
Use when the routine specifically calls for classic 4-minute Tabata.
Custom timer
Best for: Non-standard stage sequences
Use when you need more than one repeated work/rest pair.
Frequently asked questions
What can I use an interval timer for?
Interval timers work for repeated exercise rounds, mobility flows, breathing drills, studying, and any routine with alternating work and rest.
Is this different from a Tabata timer?
Yes. Tabata is a specific 20/10 format for 8 rounds. This interval timer is a broader work/rest preset.
Do I need to install an app?
No. This timer runs in the browser and stores recent completed sessions locally on your device.
What interval length should I start with?
For general routines, 45/15 is a practical default. Use 30/30 for skill practice, 20/10 for Tabata-style conditioning, or longer blocks for studying.
More free timers
Tabata Timer
A fast 20/10 interval timer for Tabata workouts, HIIT circuits, bodyweight rounds, and conditioning finishers.
Workout Timer
A training-first workout timer for warmups, circuits, rest periods, supersets, and cooldown routines.
Custom Timer
A simple custom timer starter that can become any interval, focus, workout, stretch, or productivity routine.