# Audit 4 vs Efficacy Audit

The clearest difference is update cadence: Efficacy Audit at every 4 weeks against Audit 4's every 7 months. Efficacy Audit also leads on iOS requirement (9.3 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Audit 4 ships an update every 7 months, Efficacy Audit every 4 weeks. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Audit 4 | Efficacy Audit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 weeks** |
| Size | 17 MB | 35 MB |
| Requires iOS | 12.0 | **9.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Audit4 Compliance Ltd](https://appshunter.io/developer/1211717324) | [Synbiotix Ltd](https://appshunter.io/developer/978319328) |

## What reviewers say

### Audit 4

[App page](https://appshunter.io/ios/app/audit-4/id1211717325)

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

**In-app purchases:** none


### Efficacy Audit

[App page](https://appshunter.io/ios/app/efficacy-audit/id1600275715)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Audit 4 free?

Audit 4 is free to download, with no in-app purchases.

### Is Efficacy Audit free?

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

### Do Audit 4 or Efficacy Audit have ads?

Neither Audit 4 nor Efficacy Audit shows ads.

### Which is updated more often, Audit 4 or Efficacy Audit?

Audit 4 ships an update every 7 months, and Efficacy Audit every 4 weeks. Most recently, Audit 4 was updated on October 12, 2026 and Efficacy Audit on October 25, 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.*