Tennis Notes vs VO2 Max Tracker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tennis Notes
This app helps tennis players improve their game by tracking matches, planning future sessions, and analyzing performance trends. It allows users to create opponent profiles, store tactical notes, and gain insights into their strengths and weaknesses. Integrated with Apple Watch for seamless workout data tracking.
- Log match and training sessions
- Schedule future matches and trainings
- Store tactics, lessons, and reflections
- Create detailed opponent profiles
- Analyze long-term game trends
- Track sessions from Apple Watch
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Tennis is a sport of the mind. Inspired by the journaling routines of professional players, Tennis Notes helps you reflect on your matches, prepare for upcoming opponents, and recognize patterns in your game over time. Built by a fellow player, it’s designed to support the mental and strategic side of tennis—on and off the court. Key features: Sessions – Log match and training sessions to build a history of your time on court, helping you review past performances and track your progress. Apple Watch – Track your sessions and score directly from your wrist, with full Health integration for workout data. Rivals – Create detailed opponent profiles with strengths, weaknesses, and match history to prepare for rematches. Analytics – See long-term trends in your game with stats like time on court, win/loss ratios, and effort levels. Plans – Schedule future matches and trainings to stay prepared and be ready for your opponents. Notes – Keep all your tennis-related thoughts in one place: tactics, lessons and reflections. As Tennis Notes aims to become the #1 tennis journal on the platform, your feedback is crucial to the future of the app. Please feel free to share your experiences and ideas by sending an email to tennisnotesapp@gmail.com!
VO2 Max Tracker
Measure your cardio fitness (VO₂ max) using a treadmill test and track your progress. Create or select from pre-made HIIT workouts, with real-time guidance on target zones. Integrates with Apple Watch and Bluetooth heart rate monitors.
- VO₂ max testing on treadmills
- HIIT workout creation and selection
- Real-time target zone guidance
- Apple Watch and heart rate monitor integration
- Workout history with heart rate graphs
- iCloud data synchronization
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Use Zephyrus to test your cardio fitness (VO₂ max) on a treadmill, and track your improvement. You can also use Zephyrus to do HIIT workouts. The app comes with a selection of workouts, and lets you create your own workouts. Zephyrus tells you when the target zone changes. To get your heart rate in the app, you can use Apple Watch or heart rate monitors with Bluetooth. Garmin watches with Virtual Run are supported. Cardio fitness is measured with a modified Bruce protocol test you can perform on most treadmills. The test consists of stages with increasing intensity and ends when you reach 85% of maximum heart rate. You can do HIIT workouts on Apple Watch, so you don't have to bring your phone. Your past workouts are saved to your workout history, where you can see the heart rate graph and calories burned. Your data is stored in iCloud, which makes it accessible across your Apple devices. Always consult with a healthcare provider before starting any new exercise program. Exercise can carry risks, especially for people who have certain medical conditions or who have not been physically active in a long time. It's important to understand that using this app does not replace a doctor's advice or treatment. If you would like to report an issue or request a feature for the app, feel free to contact the App Support email. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Tennis Notes at 4.8 against VO2 Max Tracker's 4.0. Tennis Notes also leads on ratings volume (16 vs 1). VO2 Max Tracker's advantage is update cadence (every 2 weeks vs every 4 weeks). On price, ads, 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. Tennis Notes sells 1 one-off in-app purchase and VO2 Max Tracker sells 6 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Tennis Notes holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Tennis Notes has 16 ratings behind it against 1, so its average is the more settled of the two.
Tennis Notes ships an update every 4 weeks, VO2 Max Tracker every 2 weeks. Both last shipped on October 30, 2026.
| Parameter | Tennis Notes | VO2 Max Tracker |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (16 ratings) — better | 4.0 (1 ratings) |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 16 — better | 1 |
| Update frequency | Every 4 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, Apple Watch | iPhone, iPad, Apple Watch — better |
| Requires iOS | 17.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 201 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Intuitive Computers | Havard Tryman |
Customer experience
Tennis Notes
VO2 Max Tracker
In-app purchases
Tennis Notes
- Tennis Notes - Pro Lifetime$12.99
VO2 Max Tracker
- Pro (Weekly)7 Days trial$4.997 Days
- Pro (Monthly)3 Days trial$7.991 Month
- Pro3 Days trial$8.997 Days
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- Pro$24.991 Year
- Pro (Yearly)3 Days trial$24.991 Year
- Pro (Yearly)$59.991 Year









