# PPM系统 vs Tongue Drum

The clearest difference is in-app purchases: PPM系统 at none against Tongue Drum's 4. PPM系统 also leads on iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Tongue Drum sells 4 in-app purchases, starting at $4.99 per month. PPM系统 asks for nothing beyond the download.

PPM系统 ships an update every 9 days, Tongue Drum weekly. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | PPM系统 | Tongue Drum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/tongue-drum/id1671097888/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 120 MB | 235 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [飞虎 官](https://appshunter.io/developer/1489124008) | [杭州点音教育科技有限公司](https://appshunter.io/developer/1559024125) |

## 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


### Tongue Drum

[App page](https://appshunter.io/ios/app/tongue-drum/id1671097888)

This handpan learning tool uses a graphical interface to present musical notes, making the learning process more engaging and enjoyable. It offers a visual approach to mastering the instrument.

**Highlights:** Graphical note presentation, Enjoyable learning experience, Handpan instrument focus, Visual learning approach

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month | $4.99 | per month |
| 1个月 | $4.99 | per month |
| Quarter | $12.99 | per 3 months |
| Year | $39.99 | per year |


## Frequently asked questions

### Is PPM系统 free?

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

### Is Tongue Drum free?

Tongue Drum is free to download, with in-app purchases available.

### Do PPM系统 or Tongue Drum have ads?

Neither PPM系统 nor Tongue Drum shows ads.

### Which is updated more often, PPM系统 or Tongue Drum?

PPM系统 ships an update every 9 days, and Tongue Drum weekly. Most recently, PPM系统 was updated on October 14, 2026 and Tongue Drum on October 24, 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.*