# Auth0 Guardian vs FIS Authenticator

The clearest difference is rating: FIS Authenticator at 4.2 against Auth0 Guardian's 2.4. FIS Authenticator also leads on review sentiment (25% vs 15%). On price, ratings volume, update cadence and ads there is nothing between them.

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

FIS Authenticator holds the better App Store score, 4.2 against 2.4. Both are backed by a comparable volume of ratings — 113 and 236 respectively. Written reviews point the same way: 15% of Auth0 Guardian's written reviews are positive against 25% of FIS Authenticator's.

Auth0 Guardian ships an update every 3 months, FIS Authenticator every 2 months. The most recent releases landed on September 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Auth0 Guardian | FIS Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (113 ratings)](https://appshunter.io/ios/app/auth0-guardian/id1093447833/reviews) | **[4.2 (236 ratings)](https://appshunter.io/ios/app/fis-authenticator/id1441329874/reviews)** |
| Number of ratings | 113 | **236** |
| Positive reviews | 14.6% of reviews | **25.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 20 MB | 38 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Auth0](https://appshunter.io/developer/1076692516) | [eFunds Corporation](https://appshunter.io/developer/354569718) |

## What reviewers say

### Auth0 Guardian

[App page](https://appshunter.io/ios/app/auth0-guardian/id1093447833)

This app provides multi-factor authentication by sending push notifications to your device for easy approval or denial of account access. It can also generate one-time passwords for secure logins.

**Highlights:** Push notification authentication, Allow/deny account access, One-time password generation, Multi-factor authentication, Secure login

**Features:** Vision Pro support

**In-app purchases:** none


### FIS Authenticator

[App page](https://appshunter.io/ios/app/fis-authenticator/id1441329874)

This app provides a secure second-factor authentication solution for users of FIS' Infinity IdP identity management service. It acts as a mobile companion to enhance account security.

**Highlights:** Second-factor authentication, Identity management companion, Enhanced account security, Mobile authentication

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

**In-app purchases:** none


## Frequently asked questions

### Is Auth0 Guardian free?

Auth0 Guardian is free to download, with no in-app purchases.

### Is FIS Authenticator free?

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

### Which has better reviews, Auth0 Guardian or FIS Authenticator?

FIS Authenticator is rated higher. Auth0 Guardian averages 2.4 out of 5 from 113 ratings, while FIS Authenticator averages 4.2 from 236 ratings.

### Do Auth0 Guardian or FIS Authenticator have ads?

Neither Auth0 Guardian nor FIS Authenticator shows ads.

### Which is updated more often, Auth0 Guardian or FIS Authenticator?

Auth0 Guardian ships an update every 3 months, and FIS Authenticator every 2 months. Most recently, Auth0 Guardian was updated on September 17, 2026 and FIS Authenticator on September 18, 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.*