# Kai Tennis vs StringPing

The clearest difference is in-app purchases: Kai Tennis at none against StringPing's 4. Kai Tennis also leads on device support (3 vs 1) and iOS requirement (15.0 vs 26.5). StringPing's advantage is update cadence (daily vs monthly). On price and ads there is nothing between them.

Both are free to download. StringPing sells 4 one-off in-app purchases. Kai Tennis asks for nothing beyond the download.

Kai Tennis ships an update monthly, StringPing daily. The most recent releases landed on November 8, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Kai Tennis | StringPing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (44 ratings)](https://appshunter.io/ios/app/kai-tennis/id6748925788/reviews)** | — |
| Number of ratings | **44** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Monetization | Free | — |
| Size | 120 MB | 6 MB |
| Requires iOS | **15.0** | 26.5 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ohana Sports Tech](https://appshunter.io/developer/1828023948) | [Korhan Pekun](https://appshunter.io/developer/6811897935) |

## What reviewers say

### 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


### StringPing

[App page](https://appshunter.io/ios/app/stringping/id6811897693)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Overgrip | $1.99 | one-time |
| Can of Tennis Balls | $4.99 | one-time |
| Set of Strings | $9.99 | one-time |
| Reel of String | $19.99 | one-time |


## Frequently asked questions

### Is Kai Tennis free?

Kai Tennis is free to download, with no in-app purchases.

### Is StringPing free?

StringPing is free to download, with in-app purchases available.

### Do Kai Tennis or StringPing have ads?

Neither Kai Tennis nor StringPing shows ads.

### Which is updated more often, Kai Tennis or StringPing?

Kai Tennis ships an update monthly, and StringPing daily. Most recently, Kai Tennis was updated on November 8, 2026 and StringPing on November 6, 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.*