# OTAC auth vs Fasoo Secure Viewer

OTAC auth and Fasoo Secure Viewer are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OTAC auth | Fasoo Secure Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Size | 10 MB | 118 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [swIDch Limited](https://appshunter.io/developer/1723421198) | [Fasoo AI Co., Ltd.](https://appshunter.io/developer/429136974) |

## What reviewers say

### OTAC auth

[App page](https://appshunter.io/ios/app/otac-auth/id6475137518)

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

**In-app purchases:** none


### Fasoo Secure Viewer

[App page](https://appshunter.io/ios/app/fasoo-secure-viewer/id6478472132)

**In-app purchases:** none


## Frequently asked questions

### Is OTAC auth free?

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

### Is Fasoo Secure Viewer free?

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

### Do OTAC auth or Fasoo Secure Viewer have ads?

Neither OTAC auth nor Fasoo Secure Viewer shows ads.

### Which is updated more often, OTAC auth or Fasoo Secure Viewer?

OTAC auth ships an update every 6 weeks, and Fasoo Secure Viewer every 6 weeks. Most recently, OTAC auth was updated on November 4, 2026 and Fasoo Secure Viewer 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.*