# Authenticator vs ZETIT Key

The clearest difference is in-app purchases: ZETIT Key at none against Authenticator's 2. ZETIT Key also leads on iOS requirement (15.1 vs 18.5). Authenticator's advantage is update cadence (weekly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Authenticator sells 2 in-app purchases, starting at $9.99 per 7 days. ZETIT Key asks for nothing beyond the download.

Authenticator ships an update weekly, ZETIT Key every 2 months. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Authenticator | ZETIT Key |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Size | 112 MB | 20 MB |
| Requires iOS | 18.5 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BU Guard GmbH](https://appshunter.io/developer/1858539616) | [ZETIT](https://appshunter.io/developer/1894262387) |

## What reviewers say

### Authenticator

[App page](https://appshunter.io/ios/app/authenticator-2fa-app/id6760155508)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $9.99 | per 7 days |
| Premium Access Year | $44.99 | per year |


### ZETIT Key

[App page](https://appshunter.io/ios/app/zetit-key/id6762467691)

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

**In-app purchases:** none


## Frequently asked questions

### Is Authenticator free?

Authenticator is free to download, with in-app purchases available.

### Is ZETIT Key free?

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

### Do Authenticator or ZETIT Key have ads?

Neither Authenticator nor ZETIT Key shows ads.

### Which is updated more often, Authenticator or ZETIT Key?

Authenticator ships an update weekly, and ZETIT Key every 2 months. Most recently, Authenticator was updated on October 3, 2026 and ZETIT Key on October 2, 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.*