# Jetfoiler vs Kai Tennis

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.

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.

## The numbers

| Metric | Jetfoiler | Kai Tennis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/jetfoiler/id1555588917/reviews)** | [4.9 (42 ratings)](https://appshunter.io/ios/app/kai-tennis/id6748925788/reviews) |
| Number of ratings | 1 | **42** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Monthly |
| Monetization | Free | Free |
| Size | 30 MB | 120 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Kai Concepts, LLC](https://appshunter.io/developer/1555588919) | [Ohana Sports Tech](https://appshunter.io/developer/1828023948) |

## What reviewers say

### Jetfoiler

[App page](https://appshunter.io/ios/app/jetfoiler/id1555588917)

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:** macOS Compatibility

**In-app purchases:** none


### Kai Tennis

[App page](https://appshunter.io/ios/app/kai-tennis/id6748925788)

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:** Apple Watch app

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*