# 成长星约定 vs 九九学堂

The clearest difference is price: 成长星约定 at Free against 九九学堂's $0.99. 九九学堂's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

成长星约定 is free to download; 九九学堂 costs $0.99 up front. 成长星约定 sells 2 one-off in-app purchases. 九九学堂 asks for nothing beyond the download.

## The numbers

| Metric | 成长星约定 | 九九学堂 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 55 MB | 5 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [均 李](https://appshunter.io/developer/1153873787) | [凌云 何](https://appshunter.io/developer/1879789850) |

## What reviewers say

### 成长星约定

[App page](https://appshunter.io/ios/app/id6740259996)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $1.99 | one-time |
| 终身会员 | $4.99 | one-time |


### 九九学堂

[App page](https://appshunter.io/ios/app/id6797739862)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 成长星约定 free?

成长星约定 is free to download, with in-app purchases available.

### Is 九九学堂 free?

九九学堂 costs $0.99, with no in-app purchases.

### Do 成长星约定 or 九九学堂 have ads?

Neither 成长星约定 nor 九九学堂 shows ads.

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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.*