ComboTimer vs Underwater Stopwatch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ComboTimer
Create custom sequences of timers for various activities, from workouts to work sessions. Arrange timers in a row, set repeats, insert pauses, and choose from multiple sounds. Save and load your timer configurations for easy reuse.
- Sequential timer arrangement
- Repeatable timers
- Customizable pauses
- Multiple sound options
- Save and load timer configurations
- Pomodoro Technique support
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ComboTimer is a timer application which is versatile and simple to use. "I want to play a sound every hour." "Push-ups for 30 seconds then sit-ups for 30 seconds. Repeat 3 times and finish." "First, fry on high flame for 2 min. Second, a low flame for 15 min. Then pause the timer and season. Finally, fry on medium flame for 5 min." "Concentrate on a task for 25min. Then, take a 5min break. Repeat this series 4 times. Upon completion, treat yourself to a long 30min break. Now you're ready to continue. (Pomodoro Technique)" As shown in these examples, you are able to create a series of timers under one heading. The following timers "Step Timer", "Program Timer", "Interval Timer", "Multi Timer" or "Scenario Timer". You may find it hard to picture, but once you get the hang of ComboTimer, it will be a breeze. - You can arrange some timers in a row and run them sequentially. - There are more than 10 sounds to choose from. - You can set timers on repeat. - You're able to insert pauses as you like. - You have the option to play a sound every second (or the final 3 seconds). - You can save the timers you made and load and run them at anytime. Of course ComboTimer can also be used like a standard timer. For work, for study, for sports and for hobbies. ComboTimer is useful for everyone because it's simple and easy to use.
Underwater Stopwatch
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A lightweight Apple Watch stopwatch and timer built for wet hands. Everything is controlled by rotating the Digital Crown, so you never need the touchscreen. It keeps working when your fingers are wet, gloved, or underwater, and while your watch is in Water Lock. TWO MODES Stopwatch counts up from zero, with laps. Timer counts down from any duration you set, drawn as a draining hourglass, with three unmistakable buzzes at zero. Run past zero and the overtime is recorded too. CROWN CONTROLS Rotate up to start, pause, and save. Rotate down to add a lap, or to continue a paused session. No taps, no buttons, nothing to fumble for. HAPTIC TIME CUES Set a repeating buzz at any interval, plus an optional stronger one for milestones. A light tap every 30 seconds and a firmer one every 5 minutes, for example. Track elapsed time without ever looking at your wrist. STAYS ON SCREEN The app holds the display for your whole session, so a glance shows your timer instead of the watch face. ON YOUR IPHONE Every session syncs across: full history, lap splits with faster and slower comparisons, and your average and longest times. Set durations and cues from either device. BUILT FOR Swimming and pool laps. Surfing. Cold plunges and sauna rounds. Breath-hold and apnea training. Anything you time where looking at a screen is not practical. PRIVATE BY DEFAULT No workouts. No fitness tracking. No Health data. No account, no subscription, no ads, no analytics. Every session stays on your devices.
Screenshots
Verdict
The clearest difference is update cadence: Underwater Stopwatch at every 3 days against ComboTimer's every 3 months. ComboTimer's advantage is iOS requirement (8.2 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ComboTimer ships an update every 3 months, Underwater Stopwatch every 3 days. The most recent releases landed on October 3, 2026 and October 8, 2026 respectively.
| Parameter | ComboTimer | Underwater Stopwatch |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 84.6% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 8.2 — better | 18.0 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | iroribit Inc. | Vlad Topala |
In-app purchases
ComboTimer
No in-app purchases
Underwater Stopwatch
No in-app purchases
Questions
Is ComboTimer free?
Is Underwater Stopwatch free?
Do ComboTimer or Underwater Stopwatch have ads?
Which is updated more often, ComboTimer or Underwater Stopwatch?
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