# Ferret OSINT vs HeaderCheck

The clearest difference is in-app purchases: Ferret OSINT at none against HeaderCheck's 1. Ferret OSINT also leads on iOS requirement (15.0 vs 26.0). HeaderCheck's advantage is update cadence (fortnightly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. HeaderCheck sells 1 one-off in-app purchase. Ferret OSINT asks for nothing beyond the download.

Ferret OSINT ships an update every 3 months, HeaderCheck fortnightly. The most recent releases landed on October 15, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Ferret OSINT | HeaderCheck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 20 MB | 2 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Konstantin Shvetsov](https://appshunter.io/developer/1882517293) | [Nicholas McLarty](https://appshunter.io/developer/1572125539) |

## What reviewers say

### Ferret OSINT

[App page](https://appshunter.io/ios/app/ferret-osint/id6760048642)

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

**In-app purchases:** none


### HeaderCheck

[App page](https://appshunter.io/ios/app/headercheck/id6809026356)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HeaderCheck Pro | $2.99 | one-time |


## Frequently asked questions

### Is Ferret OSINT free?

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

### Is HeaderCheck free?

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

### Do Ferret OSINT or HeaderCheck have ads?

Neither Ferret OSINT nor HeaderCheck shows ads.

### Which is updated more often, Ferret OSINT or HeaderCheck?

Ferret OSINT ships an update every 3 months, and HeaderCheck fortnightly. Most recently, Ferret OSINT was updated on October 15, 2026 and HeaderCheck on October 20, 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.*