# ACO Viewer vs Authenticator

The clearest difference is ads: ACO Viewer at none against Authenticator's shown. ACO Viewer also leads on iOS requirement (12.0 vs 15.0). Authenticator's advantage is update cadence (every 2 days vs every 4 months). On price, 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.

ACO Viewer ships an update every 4 months, Authenticator every 2 days. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ACO Viewer | Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/authenticator-fake-scanner/id6499281052/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 days** |
| Monetization | — | Ad-supported |
| Size | 100 MB | 4 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AUGMENTED CITY SRL](https://appshunter.io/developer/1815788390) | [Harden Consulting LLC](https://appshunter.io/developer/366561891) |

## What reviewers say

### ACO Viewer

[App page](https://appshunter.io/ios/app/aco-viewer/id1621584555)

**Features:** macOS Compatibility

**In-app purchases:** none


### Authenticator

[App page](https://appshunter.io/ios/app/authenticator-fake-scanner/id6499281052)

Simulate biometric authentication for creative projects. This app allows you to choose between palm, retina, or fingerprint scans, or passcode entry. Customize the outcome to always fail, always succeed, or use an override for demonstrations.

**Highlights:** Fake palm scanner, Fake retina scanner, Fake fingerprint scanner, Passcode entry simulation, Customizable authentication outcomes, Override authentication option

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

**In-app purchases:** none


## Frequently asked questions

### Is ACO Viewer free?

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

### Is Authenticator free?

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

### Do ACO Viewer or Authenticator have ads?

Authenticator shows ads; ACO Viewer does not.

### Which is updated more often, ACO Viewer or Authenticator?

ACO Viewer ships an update every 4 months, and Authenticator every 2 days. Most recently, ACO Viewer was updated on October 2, 2026 and Authenticator on October 7, 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.*