WatchFit vs Subintervals
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WatchFit
Create and schedule custom workouts directly on your Apple Watch. Tailor intervals, warm-ups, and cool-downs with time or distance-based steps. Receive real-time alerts for pace and heart rate to optimize your training.
- Custom workout creation
- Apple Watch integration
- Interval and phase customization
- Time and distance-based steps
- Heart rate and pace alerts
- Calendar integration
- No account required
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WatchFit is the ultimate fitness workout companion designed specifically for Apple Watch users who want to take their exercise routines to the next level. This app empowers you to create custom structured workouts tailored to your exact needs and seamlessly integrates them into the native Workout app on your Apple Watch, offering a smooth and personalized training experience. With WatchFit, building your perfect workout schedule has never been easier. You can customize every element of your training with detailed control over warmup, cooldown, and interval phases. Whether your workout steps are based on time or distance, WatchFit supports them all. For endurance sports such as running and cycling, it even offers distance-based step options, enhancing your precision and control in each session. You can plan your fitness routine ahead of time and watch as scheduled workouts automatically sync to your Apple Watch. Once added, these customized workouts appear right on the Workout app on your Apple Watch's home screen, ready to be started at the perfect moment, helping you stay accountable and motivated. One of the standout features of WatchFit is its advanced heart rate monitor integration and in-workout alert system. You can set up pace or heart rate alerts that notify you if you stray above or below your target zones during exercise. This real-time feedback keeps you in your ideal training intensity, ensuring every workout is optimized for maximum benefit. Managing your weekly fitness workout schedule is streamlined through an intuitive interface that lets you view your upcoming workouts, track completed sessions, and identify any missed ones. This visibility promotes consistency and helps reinforce your training habits. Plus, with calendar integration, your scheduled workouts are automatically added to your calendar app, so you never accidentally skip an important session. Privacy and security are paramount in WatchFit’s design. Unlike many fitness apps, WatchFit requires no account setup, and purchases are handled anonymously. Your custom workouts sync securely to your iCloud account, ensuring your data stays private and intact even if you switch devices or reinstall the app. WatchFit doesn’t gather user analytics or access personal workout data beyond verifying if workouts were completed, giving you full confidence in your privacy. Whether you're a seasoned athlete or just starting your fitness journey, WatchFit equips you with the tools to create personalized workouts that match your unique goals. By adding your workouts directly to the Apple Watch native Workout app, you reduce distractions and streamline your fitness experience, allowing you to focus fully on performance and progress. With its user-friendly scheduling, structured workout routines, heart rate alerts, and seamless Apple Watch integration, WatchFit is much more than a simple fitness workout app—it’s an intelligent fitness partner that supports your active lifestyle with precision and privacy. Maximize your training, stay committed to your goals, and enjoy the empowerment of having all your workouts perfectly organized on your Apple Watch home screen. Note: For the best experience, WatchFit is optimized for Apple Watch devices running watchOS 10 or later, paired with an iPhone. Terms & Conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://sites.google.com/view/watchfit-privacy-policy"
Subintervals
Visualize your training data with detailed displays and interactive graphs. Customize your analysis and sync seamlessly with intervals.icu for up-to-the-minute insights into activities, events, and performance metrics.
- Detailed activity and event visualization
- Interactive performance graphs
- Seamless intervals.icu sync
- Customizable data analysis
- Actionable training insights
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Elevate Your Training with Subintervals Subintervals transforms your intervals.icu data into actionable insights. This app brings your training activities, events, and performance metrics to life through detailed displays and interactive graphs. Customise and control your data for a tailored analysis, and seamlessly sync with intervals.icu for up-to-the-minute information. Key Features: - Detailed visualisation of activities and events. - Dynamic, interactive graphs for performance tracking. - Effortless sync with intervals.icu. Please note that it is an independent application developed by an enthusiast keen on providing a complementary tool to the official platform.
Screenshots
Verdict
WatchFit and Subintervals both sit at 4.9 stars, but that hides the real split: 100% of Subintervals's written reviews are positive against 82% of WatchFit's. Subintervals also leads on update cadence (weekly vs every 3 weeks). WatchFit's advantage is ratings volume (34 vs 2). On price, rating, ads and in-app purchases 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. WatchFit sells 5 in-app purchases, starting at $1.99 per month and Subintervals sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.9 for WatchFit against 5.0 for Subintervals. That said, the two scores are not equally well evidenced: WatchFit has 34 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 82% of WatchFit's written reviews are positive against 100% of Subintervals's.
WatchFit ships an update every 3 weeks, Subintervals weekly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | WatchFit | Subintervals |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (34 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 81.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 34 — better | 2 |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 17 MB | 109 MB |
| Age rating | 4+ | 4+ |
| Developer | Mathieu Savaria | Inaki Arroyo Nebreda |
Customer experience
WatchFit
Subintervals
In-app purchases
WatchFit
- WatchFit Premium$1.991 Month
- WatchFit Premium3 Days trial$9.991 Year
- WatchFit Premium (Special)Free
- WatchFit Premium (Sale)$9.99
- WatchFit Premium (Lifetime)$19.99
Subintervals
- Coffee$3.99
- Lunch$11.99
- Big Thanks$17.99
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- Sponsor$44.99









