# Authenticator TOTP vs ZETIT Key

The clearest difference is in-app purchases: ZETIT Key at none against Authenticator TOTP's 4. ZETIT Key also leads on iOS requirement (15.1 vs 17.6). Authenticator TOTP's advantage is update cadence (fortnightly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Authenticator TOTP sells 4 in-app purchases, starting at $3.49 per 7 days. ZETIT Key asks for nothing beyond the download.

Authenticator TOTP ships an update fortnightly, ZETIT Key every 2 months. The most recent releases landed on October 5, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Authenticator TOTP | ZETIT Key |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Size | 15 MB | 20 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Boris Spiro](https://appshunter.io/developer/1853293003) | [ZETIT](https://appshunter.io/developer/1894262387) |

## What reviewers say

### Authenticator TOTP

[App page](https://appshunter.io/ios/app/authenticator-totp/id6757983630)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.49 | per 7 days |
| Monthly | $7.99 | per month |
| Yearly | $49.99 | per year |
| Lifetime | $79.99 | one-time |


### 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 TOTP free?

Authenticator TOTP 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 TOTP or ZETIT Key have ads?

Neither Authenticator TOTP nor ZETIT Key shows ads.

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

Authenticator TOTP ships an update fortnightly, and ZETIT Key every 2 months. Most recently, Authenticator TOTP was updated on October 5, 2026 and ZETIT Key on October 19, 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.*