# Unfog vs Klartone

The clearest difference is in-app purchases: Klartone at none against Unfog's 3. Klartone also leads on iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Unfog sells 3 in-app purchases, starting at $2.99 per 7 days. Klartone asks for nothing beyond the download.

## The numbers

| Metric | Unfog | Klartone |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 days | — |
| Size | 80 MB | 46 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BITSEC SP. Z O.O.](https://appshunter.io/developer/1801990616) | [Melissa AIT OUARAB](https://appshunter.io/developer/6792328572) |

## What reviewers say

### Unfog

[App page](https://appshunter.io/ios/app/unfog-feynman-study-notes/id6776245365)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unfog weekly | $2.99 | per 7 days |
| Unfog Monthly | $17.99 | per month |
| Unfog Annual | $29.99 | per year |


### Klartone

[App page](https://appshunter.io/ios/app/klartone/id6792328570)

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

**In-app purchases:** none


## Frequently asked questions

### Is Unfog free?

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

### Is Klartone free?

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

### Do Unfog or Klartone have ads?

Neither Unfog nor Klartone shows ads.

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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.*