# Piano Prober vs eFlightBook

The clearest difference is update cadence: eFlightBook at fortnightly against Piano Prober's every 5 weeks. Piano Prober's advantage is iOS requirement (12.0 vs 14.2). On price, ads, in-app purchases and device support there is nothing between them.

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, eFlightBook fortnightly. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Piano Prober | eFlightBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Size | 10 MB | 101 MB |
| Requires iOS | **12.0** | 14.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [绍军 初](https://appshunter.io/developer/1195414685) | [PH-Informatik](https://appshunter.io/developer/595299933) |

## What reviewers say

### Piano Prober

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

**Features:** macOS Compatibility

**In-app purchases:** none


### eFlightBook

[App page](https://appshunter.io/ios/app/eflightbook/id6476969610)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Piano Prober free?

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

### Is eFlightBook free?

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

### Do Piano Prober or eFlightBook have ads?

Neither Piano Prober nor eFlightBook shows ads.

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

Piano Prober ships an update every 5 weeks, and eFlightBook fortnightly. Most recently, Piano Prober was updated on October 7, 2026 and eFlightBook 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.*