Interval Timer vs Once Fit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interval Timer
This interval timer is designed for HIIT and interval training. Easily set work and rest periods, sets, and rounds to guide your workouts. It supports background operation and music playback, with an Apple Watch companion app for heart rate monitoring.
- Customizable work and rest periods
- Set number of sets and rounds
- Background operation support
- Music playback compatibility
- Apple Watch integration
- Heart rate monitoring (Apple Watch)
Read full descriptionHide full description
This app is handy interval timer that helps you keep track of your work and rest periods during your HIIT interval training and workouts. The application is very easy to use, enter the Work, Rest, Sets, Rounds and start workout. You can listen to music during workouts or use the timer in the background. There is also app on the Apple Watch that will allow you to monitor your heart rate during workouts. Apple Watch app features: - iCloud sync with iPhone - integration with the Health app - monitoring heart rate during workouts
Once Fit
Track your fitness, sleep patterns, and biometric data. Receive notifications for calls and messages while exercising. Integrates with HealthKit on iOS for comprehensive health insights.
- Biometric and performance insights
- Step count and exercise heat conversion
- Daily sleep status recording
- Sports and health information sharing
- Call, SMS, and app notification reminders
- HealthKit integration
Read full descriptionHide full description
The Once Fit App provides you with biometric and performance insights into your health, wellbeing and total fitness. 1.Support step count function and exercise heatconversion function. 2. Record your daily sleep status and inform you of your daily deep sleep, light sleep and awake stages. 3.Support functions such as sports and health information sharing. 4.Convenient reception of call reminders, SMSreminders, APP notification reminders, and otherfunctions during exercise. Tips: This app supports the HealthKit application on iOS 11 and above systems, allowing you to view your health data through HealthKit.
Screenshots
Verdict
The clearest difference is rating: Interval Timer at 4.9 against Once Fit's 4.0. Interval Timer also leads on ratings volume (246 vs 1) and device support (4 vs 2). Once Fit's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price 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. Interval Timer sells 1 one-off in-app purchase. Once Fit asks for nothing beyond the download.
Interval Timer holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: Interval Timer has 246 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 84% of Interval Timer's written reviews are positive against 100% of Once Fit's, so the app with the better star average is not the one people write more warmly about.
Interval Timer ships an update every 2 months, Once Fit every 2 weeks. The most recent releases landed on October 19, 2026 and October 2, 2026 respectively.
| Parameter | Interval Timer | Once Fit |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (246 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 83.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 246 — better | 1 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 300 MB |
| Age rating | 4+ | 4+ |
| Developer | Yosyp Hameliak | Shenzhen Quangu Technology Co., Ltd. |
Customer experience
Interval Timer
Once Fit
Bugs and requests
Interval Timer
Reported bugs
9 issues- App pauses when phone is locked
- Sound notifications are inconsistent
- App doesn't run in background
- Watch app not opening or syncing
- In-app purchase issues
Show 4 moreShow fewer
- Timer not counting when phone is locked
- Voice/sound stops during exercises
- Incorrect number of sets displayed
- App crashes or freezes
Requested features
12 requests- Option for different/upbeat voice
- Ability to reorder saved timers
- Larger font size option
- Vibrate option
- Naming individual sets/exercises
Show 7 moreShow fewer
- Audio configuration for set completion
- Syncing workouts with health apps
- Option to keep app running when phone is locked
- Customizable warm-up per saved timer
- Option for giant font size for numbers
- Ability to move saved timers
- More sound options
Once Fit
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Interval Timer
- Remove Ads$4.99
Once Fit
No in-app purchases
