# 古筝网App vs GRETA OTO

The clearest difference is in-app purchases: GRETA OTO at none against 古筝网App's 10. GRETA OTO also leads on iOS requirement (12.1 vs 15). 古筝网App's advantage is update cadence (every 2 weeks vs every 4 weeks). On price, ads and device support there is nothing between them.

Both are free to download. 古筝网App sells 10 one-off in-app purchases. GRETA OTO asks for nothing beyond the download.

古筝网App ships an update every 2 weeks, GRETA OTO every 4 weeks. The most recent releases landed on September 14, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | 古筝网App | GRETA OTO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 weeks |
| Size | 117 MB | 136 MB |
| Requires iOS | 15 | **12.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Guzheng Culture Media Co., Ltd.](https://appshunter.io/developer/918351021) | [绍纲 汪](https://appshunter.io/developer/1792148257) |

## What reviewers say

### 古筝网App

[App page](https://appshunter.io/ios/app/app/id918351022)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6枚筝币 | $0.99 | one-time |
| 68枚筝币 | $9.99 | one-time |
| 邓翊群专项练习曲30首 | $14.99 | one-time |
| 208枚筝币 | $30.99 | one-time |
| 在线课堂会员12个月 | $59.99 | one-time |
| 集体样板课会员12个月 | $79.99 | one-time |
| 365在线课堂2年购买 | $89.99 | one-time |
| 698枚筝币 | $109.99 | one-time |
| 998枚筝币 | $149.99 | one-time |
| 1998枚筝币 | $299.99 | one-time |


### GRETA OTO

[App page](https://appshunter.io/ios/app/greta-oto/id6740990140)

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

**In-app purchases:** none


## Frequently asked questions

### Is 古筝网App free?

古筝网App is free to download, with in-app purchases available.

### Is GRETA OTO free?

GRETA OTO is free to download, with no in-app purchases.

### Do 古筝网App or GRETA OTO have ads?

Neither 古筝网App nor GRETA OTO shows ads.

### Which is updated more often, 古筝网App or GRETA OTO?

古筝网App ships an update every 2 weeks, and GRETA OTO every 4 weeks. Most recently, 古筝网App was updated on September 14, 2026 and GRETA OTO on September 13, 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.*