# Mahjong Training vs CST ON

The clearest difference is in-app purchases: CST ON at none against Mahjong Training's 1. Mahjong Training's advantage is iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mahjong Training sells 1 one-off in-app purchase. CST ON asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Mahjong Training | CST ON |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Size | 146 MB | 21 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 12+ |
| Developer | [捷 胡](https://appshunter.io/developer/1716308769) | [Companhia Santomense de Telecomunicações](https://appshunter.io/developer/1710381116) |

## What reviewers say

### Mahjong Training

[App page](https://appshunter.io/ios/app/mahjong-training-be-a-master/id6472035775)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mahjong Master Pro | $17.99 | one-time |


### CST ON

[App page](https://appshunter.io/ios/app/cst-on/id6752773766)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mahjong Training free?

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

### Is CST ON free?

CST ON is free to download, with no in-app purchases.

### Do Mahjong Training or CST ON have ads?

Both Mahjong Training and CST ON show ads.

### Which is updated more often, Mahjong Training or CST ON?

Mahjong Training ships an update every 2 months, and CST ON every 2 months. Most recently, Mahjong Training was updated on October 8, 2026 and CST ON on October 16, 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.*