# PPM系统 vs 钢琴巴士

The clearest difference is in-app purchases: PPM系统 at none against 钢琴巴士's 13. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 钢琴巴士 sells 13 one-off in-app purchases. PPM系统 asks for nothing beyond the download.

PPM系统 ships an update every 9 days, 钢琴巴士 every 2 weeks. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PPM系统 | 钢琴巴士 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/id1607244680/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 44.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 120 MB | 103 MB |
| Requires iOS | 13.0 | **12** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [飞虎 官](https://appshunter.io/developer/1489124008) | [Shanghai Music Publishing House Co., Ltd.](https://appshunter.io/developer/651417370) |

## What reviewers say

### PPM系统

[App page](https://appshunter.io/ios/app/ppm/id1489124009)

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

**In-app purchases:** none


### 钢琴巴士

[App page](https://appshunter.io/ios/app/id1607244680)

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ABRSM英皇考级精选录播课（二级）-vip专属 | $4.99 | one-time |
| ABRSM英皇考级精选录播课（七级）-vip专属 | $6.99 | one-time |
| ABRSM英皇考级精选录播课（六级）-vip专属 | $6.99 | one-time |
| ABRSM英皇考级精选录播课（七级） | $7.99 | one-time |
| ABRSM英皇考级精选录播课（一级）-vip专属 | $7.99 | one-time |
| ABRSM英皇考级精选录播课（初级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（三级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（四级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（八级）-vip专属 | $9.99 | one-time |
| ABRSM英皇考级精选录播课（五级）-vip专属 | $12.99 | one-time |
| 钢琴巴士月卡会员 | $12.99 | one-time |
| 全年陪练卡 | $99.99 | one-time |
| 优惠年卡会员 | $149.99 | one-time |


## Frequently asked questions

### Is PPM系统 free?

PPM系统 is free to download, with no in-app purchases.

### Is 钢琴巴士 free?

钢琴巴士 is free to download, with in-app purchases available.

### Do PPM系统 or 钢琴巴士 have ads?

Neither PPM系统 nor 钢琴巴士 shows ads.

### Which is updated more often, PPM系统 or 钢琴巴士?

PPM系统 ships an update every 9 days, and 钢琴巴士 every 2 weeks. Most recently, PPM系统 was updated on October 14, 2026 and 钢琴巴士 on October 7, 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.*