# Instrument Classification vs KeyConfig

The clearest difference is ads: KeyConfig at none against Instrument Classification's shown. Instrument Classification's advantage is update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Instrument Classification ships an update every 2 weeks, KeyConfig every 2 months. Both last shipped on September 24, 2026.

## The numbers

| Metric | Instrument Classification | KeyConfig |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 43 MB | 51 MB |
| Requires iOS | 15.8.3 | **15.6** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [SHENZHEN KEYKING TECHNOLOGY CO.,LTD.](https://appshunter.io/developer/705079409) |

## What reviewers say

### Instrument Classification

[App page](https://appshunter.io/ios/app/instrument-classification/id6749178763)

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

**In-app purchases:** none


### KeyConfig

[App page](https://appshunter.io/ios/app/keyconfig/id6757148980)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Instrument Classification free?

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

### Is KeyConfig free?

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

### Do Instrument Classification or KeyConfig have ads?

Instrument Classification shows ads; KeyConfig does not.

### Which is updated more often, Instrument Classification or KeyConfig?

Instrument Classification ships an update every 2 weeks, and KeyConfig every 2 months. Most recently, Instrument Classification was updated on September 24, 2026 and KeyConfig on September 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.*