# Piano Prober vs MOC

Piano Prober and MOC are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Piano Prober ships an update every 5 weeks, MOC every 2 months. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Piano Prober | MOC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 10 MB | 69 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [绍军 初](https://appshunter.io/developer/1195414685) | [福建佰育科技](https://appshunter.io/developer/1655475063) |

## What reviewers say

### Piano Prober

[App page](https://appshunter.io/ios/app/piano-prober/id1209745376)

**Features:** macOS Compatibility

**In-app purchases:** none


### MOC

[App page](https://appshunter.io/ios/app/moc/id6584520442)

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

**In-app purchases:** none


## Frequently asked questions

### Is Piano Prober free?

Piano Prober is free to download, with no in-app purchases.

### Is MOC free?

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

### Do Piano Prober or MOC have ads?

Neither Piano Prober nor MOC shows ads.

### Which is updated more often, Piano Prober or MOC?

Piano Prober ships an update every 5 weeks, and MOC every 2 months. Most recently, Piano Prober was updated on October 7, 2026 and MOC on October 10, 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.*