# yACK FAST vs NACVIEW Authenticator

The clearest difference is update cadence: yACK FAST at every 2 months against NACVIEW Authenticator's every 12 months. 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.

yACK FAST ships an update every 2 months, NACVIEW Authenticator every 12 months. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | yACK FAST | NACVIEW Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 12 months |
| Size | 9 MB | 12 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Serialio Ltd.](https://appshunter.io/developer/333178140) | [NACVIEW Sp. z o.o.](https://appshunter.io/developer/1228056785) |

## What reviewers say

### yACK FAST

[App page](https://appshunter.io/ios/app/yack-fast/id1166008825)

**Features:** macOS Compatibility

**In-app purchases:** none


### NACVIEW Authenticator

[App page](https://appshunter.io/ios/app/nacview-authenticator/id1561763176)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is yACK FAST free?

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

### Is NACVIEW Authenticator free?

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

### Do yACK FAST or NACVIEW Authenticator have ads?

Neither yACK FAST nor NACVIEW Authenticator shows ads.

### Which is updated more often, yACK FAST or NACVIEW Authenticator?

yACK FAST ships an update every 2 months, and NACVIEW Authenticator every 12 months. Most recently, yACK FAST was updated on November 6, 2026 and NACVIEW Authenticator on November 11, 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.*