Simple Interval Timer vs Whistle Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simple Interval Timer
This app provides a straightforward interval timer for various training types like running, cycling, and HIIT. Customize sets, action, and break durations for a personalized workout experience. It runs in the background and saves recent configurations.
- Customizable sets, action, and break durations
- Plain and simple design
- Saves last 5 configurations
- Runs in the background
- iOS screen dimming prevention
- Apple Watch integration with heart rate monitoring
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Simple Interval Timer (SIT) can be used for any kind of interval training, such as running, cycling, HIIT sessions (including Tabata method), stretching, etc. SIT is exactly what you would expect. An interval timer, which is easy to set up and use. It features a nice plain design, with no unnecessary controls. Adjust Number of Sets, Action and Break duration to your needs and you are ready to go! On the iOS an extra switch control allows you to prevent the screen from dimming. SIT remembers the last 5 configurations you have used. Swipe left across the Settings screen to switch to another configuration. SIT can run in the background, while you are playing music, watching videos or doing anything else on your iOS device. SIT Watch features the same simplicity as the iOS app while offering the same functionality, plus it will measure your heartbeat during the workout sessions. The recordings will be available in the Apple's Health app. SIT Watch runs independently of the phone, so no need to have your phone around during your workouts (although you will need your phone during the very first time you launch SIT watch). SIT lets you avoid any tedious set up and focus on your training!
Whistle Timer
Create custom workout schedules with customizable work and break intervals. Save your training plans for future use and focus on your fitness goals. The app can run in the background to keep your workout on track.
- Customizable workout schedules
- Add custom breaks
- Save training plans
- Background operation
- Whistle sound option
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Whistle Timer lets you create a customised working schedule without anything unnecessary. - Blow a whistle forever - Add customised breaks - Focus on your workout! - Save your plans for further use - Run on the background
Screenshots
Verdict
The clearest difference is review sentiment: Simple Interval Timer at 85% against Whistle Timer's 29%. Simple Interval Timer also leads on rating (4.9 vs 4.4) and ratings volume (5.4K vs 99). Whistle Timer's advantage is ads (none vs shown). On price, update cadence, in-app purchases and monetization model 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. Simple Interval Timer sells 4 one-off in-app purchases and Whistle Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Simple Interval Timer holds the better App Store score, 4.9 against 4.4. That said, the two scores are not equally well evidenced: Simple Interval Timer has 5.4K ratings behind it against 99, so its average is the more settled of the two. Written reviews point the same way: 85% of Simple Interval Timer's written reviews are positive against 29% of Whistle Timer's.
Simple Interval Timer ships an update every 8 months, Whistle Timer every 10 months. The most recent releases landed on September 25, 2026 and September 15, 2026 respectively.
| Parameter | Simple Interval Timer | Whistle Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (5.4K ratings) — better | 4.4 (99 ratings) |
| Positive reviews | 84.7% of reviews — better | 28.6% of reviews |
| Number of ratings | 5.4K — better | 99 |
| Update frequency | Every 8 months — better | Every 10 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 14.5 — better | 15 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 4+ | +4 |
| Developer | 0FF | Applorium Ltd |
Customer experience
Simple Interval Timer
Whistle Timer
Bugs and requests
Simple Interval Timer
Reported bugs
3 issues- Timer stops working when screen is locked
- Countdown beeps not syncing with timer
- Interval times not accurately tracked
Requested features
4 requests- Ability to name and delete saved configurations
- More granular interval time settings (e.g., 1-second increments)
- Stronger haptic feedback on Apple Watch
- Integration with workout tracking apps
Whistle Timer
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Simple Interval Timer
- Espresso$0.99
- Americano$1.99
- Ad-free version$2.99
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- Caramel Cappuccino$2.99
Whistle Timer
- Unlock all settings$2.99
Questions
Is Simple Interval Timer free?
Is Whistle Timer free?
Which has better reviews, Simple Interval Timer or Whistle Timer?
Do Simple Interval Timer or Whistle Timer have ads?
Which is updated more often, Simple Interval Timer or Whistle Timer?
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