# HDI Guardian vs QCAA

The clearest difference is iOS requirement: HDI Guardian at 13.0 against QCAA's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

HDI Guardian ships an update every 3 months, QCAA every 4 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HDI Guardian | QCAA |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Size | 48 MB | 45 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [two10degrees Ltd](https://appshunter.io/developer/748325887) | [Civil Aviation Authority](https://appshunter.io/developer/1341396403) |

## What reviewers say

### HDI Guardian

[App page](https://appshunter.io/ios/app/hdi-guardian/id1516450401)

**In-app purchases:** none


### QCAA

[App page](https://appshunter.io/ios/app/qcaa/id1608050319)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HDI Guardian free?

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

### Is QCAA free?

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

### Do HDI Guardian or QCAA have ads?

Neither HDI Guardian nor QCAA shows ads.

### Which is updated more often, HDI Guardian or QCAA?

HDI Guardian ships an update every 3 months, and QCAA every 4 months. Most recently, HDI Guardian was updated on October 29, 2026 and QCAA on October 30, 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.*