Jetfoiler vs Kai Tennis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Jetfoiler
Manage and share your electric hydrofoil sessions. Monitor your equipment's battery and software, track ride data, and connect with a community of riders. Update your eFoil's software directly through the app.
- Real-time battery and software monitoring
- Detailed session tracking (path, distance, duration)
- Share rides with friends and public profiles
- Comment on and view other users' sessions
- Direct eFoil software updates
- Equipment maintenance tracking
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Discover a new dimension to your eFoil rides with Jetfoiler. Crafted for enthusiasts, our app is your central hub for managing and sharing your eFoil sessions, keeping tabs on your equipment, and joining a thriving community of riders. Monitor Your eFoil Stay ahead of maintenance and ensure your rides are always smooth and safe. Jetfoiler provides real-time battery data and software monitoring, so you're always in the know about your eFoil's health. Track and Review Your Sessions Relive your rides with our detailed session tracking. View your path, distance, duration, and more. Learn from every ride and see your progress over time. Share Your Journey Be part of a community of eFoil enthusiasts. Jetfoiler lets you view your friends' sessions and those of public profiles. Leave comments, share your experiences, and find inspiration for your next ride. Stay Updated Jetfoiler app allows you to update your eFoil's software right from the app, making it easier than ever to keep your equipment up-to-date. Join the Jetfoiler community today and elevate your eFoil experience!
Kai Tennis
Enhance your tennis practice with smart ball machine control. Choose drills based on skill level, simulate realistic rallies, and create custom training routines directly from your phone or watch. This app requires a Kai SmartModule to operate.
- Phone/watch control
- Realistic rally simulation
- Updated drill library
- Custom drill creation
- 3D drill visualization
- Works with Playmate ball machines
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Stop wasting time fiddling with height, speed, and spin knobs every time you practice. With Kai, just choose the skill you want to improve, set your level, and start your session right from your phone. Kai instantly transforms your ball machine into a smarter training partner — delivering realistic rally simulations, live-play patterns, and advanced drills designed to sharpen your game faster than ever. *** Kai requires a Kai Module to control ball machines -- coming soon!!! *** KEY FEATURES: • Control from your phone or watch Connect Kai to a supported ball machine; then start, pause, or switch drills from anywhere on the court. • Simulate real play Go beyond static feeds — practice rallies, approach shots, footwork patterns, and complex shot sequences designed by pros. • Regularly updated drill library Access an ever-growing library of drills to keep your practice fresh and challenging. • Create your own custom drills Design personalized drills to match your practice goals or favorite rally patterns — simulate any drill you can imagine. • 3D drill visualization See drills come to life with clear animations that show exactly where each shot will land and how to move for it. • Works with Playmate® iGenie and iSmash ball machines Kai adds modern control and intelligence to these trusted machines, so you can bring your club’s machine to life with cutting-edge features. With Kai, every practice session becomes smarter, more efficient, and more fun. No more guessing — just targeted training that helps you improve faster. Download now and start making every ball count!
Screenshots
Verdict
The clearest difference is update cadence: Jetfoiler at every 6 days against Kai Tennis's monthly. Jetfoiler also leads on iOS requirement (13.0 vs 15.0). Kai Tennis's advantage is ratings volume (42 vs 1). 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. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Jetfoiler against 4.9 for Kai Tennis. That said, the two scores are not equally well evidenced: Kai Tennis has 42 ratings behind it against 1, so its average is the more settled of the two.
Jetfoiler ships an update every 6 days, Kai Tennis monthly. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.
| Parameter | Jetfoiler | Kai Tennis |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.9 (42 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 42 — better |
| Update frequency | Every 6 days — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 30 MB | 120 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Concepts, LLC | Ohana Sports Tech |
Customer experience
Jetfoiler
Kai Tennis
In-app purchases
Jetfoiler
No in-app purchases
Kai Tennis
No in-app purchases









