# 洞洞谱 vs 8pu

The clearest difference is update cadence: 洞洞谱 at weekly against 8pu's every 3 weeks. 洞洞谱 also leads on iOS requirement (13.0 vs 15.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 洞洞谱 sells 3 in-app purchases, starting at $4.99 per month and 8pu sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

洞洞谱 ships an update weekly, 8pu every 3 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 洞洞谱 | 8pu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/8pu/id6752315068/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 88.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | — | Freemium |
| Size | 42 MB | 40 MB |
| Requires iOS | **13.0** | 15.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [wenlin Huang](https://appshunter.io/developer/1108308410) | [Chengdu Zhengzai Technology Co., Ltd.](https://appshunter.io/developer/1572575751) |

## What reviewers say

### 洞洞谱

[App page](https://appshunter.io/ios/app/id6741378672)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $4.99 | per month |
| 季度会员 | $7.99 | per 3 months |
| 年度会员 | $14.99 | per year |


### 8pu

[App page](https://appshunter.io/ios/app/8pu/id6752315068)

Create professional sheet music for various instruments and vocal parts on your mobile device. Features include multi-voice editing, MIDI playback, and flexible export options. Ideal for musicians, teachers, and enthusiasts.

**Highlights:** Multi-voice editing, MIDI playback with adjustable volume, Full score customization (time signature, key signature, tempo), High-fidelity playback with multiple instrument sounds, Flexible export to PDF/PNG, Cloud synchronization for progress saving

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $1.99 | per month |
| Pro | $19.99 | per year |


## Frequently asked questions

### Is 洞洞谱 free?

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

### Is 8pu free?

8pu is free to download, with in-app purchases available.

### Do 洞洞谱 or 8pu have ads?

Neither 洞洞谱 nor 8pu shows ads.

### Which is updated more often, 洞洞谱 or 8pu?

洞洞谱 ships an update weekly, and 8pu every 3 weeks. Most recently, 洞洞谱 was updated on October 30, 2026 and 8pu on November 5, 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.*