# ITTS Personal Development App vs HSK Master

The clearest difference is in-app purchases: ITTS Personal Development App at none against HSK Master's 1. ITTS Personal Development App also leads on ads (none vs shown). HSK Master's advantage is update cadence (every 2 days vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. HSK Master sells 1 one-off in-app purchase. ITTS Personal Development App asks for nothing beyond the download.

ITTS Personal Development App ships an update every 3 months, HSK Master every 2 days. The most recent releases landed on September 10, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | ITTS Personal Development App | HSK Master |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 days** |
| Size | 33 MB | 28 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [I TALK TO STRANGERS Foundation, Inc.](https://appshunter.io/developer/1780637543) | [JIHUN JO](https://appshunter.io/developer/1855392770) |

## What reviewers say

### ITTS Personal Development App

[App page](https://appshunter.io/ios/app/itts-personal-development-app/id6738397337)

**Features:** macOS Compatibility

**In-app purchases:** none


### HSK Master

[App page](https://appshunter.io/ios/app/hsk-master/id6756893592)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is ITTS Personal Development App free?

ITTS Personal Development App is free to download, with no in-app purchases.

### Is HSK Master free?

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

### Do ITTS Personal Development App or HSK Master have ads?

HSK Master shows ads; ITTS Personal Development App does not.

### Which is updated more often, ITTS Personal Development App or HSK Master?

ITTS Personal Development App ships an update every 3 months, and HSK Master every 2 days. Most recently, ITTS Personal Development App was updated on September 10, 2026 and HSK Master on September 15, 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.*