# FourScan vs Sonar

The clearest difference is in-app purchases: FourScan at none against Sonar's 3. FourScan also leads on update cadence (every 10 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sonar sells 3 in-app purchases, starting at $4.99 per 7 days. FourScan asks for nothing beyond the download.

FourScan ships an update every 10 days, Sonar every 3 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | FourScan | Sonar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Size | 3 MB | 55 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [satoshi amasaki](https://appshunter.io/developer/1891268722) | [Caue Mattos Silvestre](https://appshunter.io/developer/6780304569) |

## What reviewers say

### FourScan

[App page](https://appshunter.io/ios/app/fourscan-spy-detector/id6761895107)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sonar

[App page](https://appshunter.io/ios/app/sonar-hidden-camera-detector/id6788882245)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly Subscription | $8.99 | per month |
| Annual Subscription | $29.99 | per year |


## Frequently asked questions

### Is FourScan free?

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

### Is Sonar free?

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

### Do FourScan or Sonar have ads?

Neither FourScan nor Sonar shows ads.

### Which is updated more often, FourScan or Sonar?

FourScan ships an update every 10 days, and Sonar every 3 weeks. Most recently, FourScan was updated on October 25, 2026 and Sonar on October 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.*