Comparison

Jetfoiler vs Kai Tennis

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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!

About

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.

Highlights
  • Phone/watch control
  • Realistic rally simulation
  • Updated drill library
  • Custom drill creation
  • 3D drill visualization
  • Works with Playmate ball machines
Features
Read full description

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

Jetfoiler4 screens
Kai Tennis4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Jetfoiler ships an update every 6 days, Kai Tennis monthly. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
Jetfoiler versus Kai Tennis: the parameters behind the verdict, then further details
ParameterJetfoilerKai Tennis
PriceFreeFree
Rating5.0 (1 ratings) — better4.9 (42 ratings)
Positive reviews—100.0% of reviews
Number of ratings142 — better
Update frequencyEvery 6 days — betterMonthly
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPod, Apple Watch
Requires iOS13.0 — better15.0
Further details — not scored
Size30 MB120 MB
Age rating4+4+
DeveloperKai Concepts, LLCOhana Sports Tech

Customer experience

Jetfoiler

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Kai Tennis

All ratings42 ratings
Positive97.6%
Neutral2.4%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Jetfoiler

No in-app purchases

None

Kai Tennis

No in-app purchases

Questions

Is Jetfoiler free?
Jetfoiler is free to download, with no in-app purchases.
Is Kai Tennis free?
Kai Tennis is free to download, with no in-app purchases.
Which has better reviews, Jetfoiler or Kai Tennis?
Jetfoiler is rated higher. Jetfoiler averages 5.0 out of 5 from 1 ratings, while Kai Tennis averages 4.9 from 42 ratings.
Do Jetfoiler or Kai Tennis have ads?
Neither Jetfoiler nor Kai Tennis shows ads.
Which is updated more often, Jetfoiler or Kai Tennis?
Jetfoiler ships an update every 6 days, and Kai Tennis monthly. Most recently, Jetfoiler was updated on October 11, 2026 and Kai Tennis on October 24, 2026.

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