# x Decibel vs KeepKnow

The clearest difference is ads: KeepKnow at none against x Decibel's shown. 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.

## The numbers

| Metric | x Decibel | KeepKnow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | — | Every 3 months |
| Size | 43 MB | 48 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Singxi Limited](https://appshunter.io/developer/1844027284) | [KeepKnow New Energy Limited](https://appshunter.io/developer/1893814746) |

## What reviewers say

### x Decibel

[App page](https://appshunter.io/ios/app/x-decibel/id6754000827)

**Features:** macOS Compatibility

**In-app purchases:** none


### KeepKnow

[App page](https://appshunter.io/ios/app/keepknow/id6762320766)

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

**In-app purchases:** none


## Frequently asked questions

### Is x Decibel free?

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

### Is KeepKnow free?

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

### Do x Decibel or KeepKnow have ads?

x Decibel shows ads; KeepKnow does not.

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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.*