Auth0 Guardian vs FIS Authenticator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Auth0 Guardian
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.
- Push notification authentication
- Allow/deny account access
- One-time password generation
- Multi-factor authentication
- Secure login
Read full descriptionHide full description
Auth0 Guardian is a mobile app that can deliver push notifications to a user’s pre-registered device (typically a mobile phone or tablet) from which a user can immediately allow or deny account access via the press of a button. It can also generate one-time passwords if that is preferred. Note for developers: Auth0 Guardian is one of the multi factor authentication options that can be used within the Auth0 identity platform (https://auth0.com). You can enable it with a single switch. You don’t have to change your apps to start supporting multi factor authentication.
FIS Authenticator
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.
- Second-factor authentication
- Identity management companion
- Enhanced account security
- Mobile authentication
Read full descriptionHide full description
A mobile companion app to FIS' Infinity IdP identity management service, providing second-factor authentication for registered users.
Screenshots
Verdict
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 14%). On price, ratings volume, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 — 116 and 237 respectively. Written reviews point the same way: 14% 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 October 26, 2026 and October 24, 2026 respectively.
| Parameter | Auth0 Guardian | FIS Authenticator |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (116 ratings) | 4.2 (237 ratings) — better |
| Positive reviews | 14.3% of reviews | 25.0% of reviews — better |
| Number of ratings | 116 | 237 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Auth0 | eFunds Corporation |
Customer experience
Auth0 Guardian
FIS Authenticator
Bugs and requests
Auth0 Guardian
Reported bugs
37 issues- Notifications not working properly on iPhone iOS
- Limited notification configuration settings
- Apple Watch notification not working
- Push notifications not working
- New update broke Apple Watch approvals
Show 32 moreShow fewer
- Cannot approve MFA with Apple Watch
- Cannot long press on push notification to approve login
- Push Notification not working
- Push notifications stopped working
- Update fixed push notifications, now requires manual code entry
- New update still no notification sounds
- Receiving same code for different accounts
- iPhone does not show all numbers
- Only shows 4 numbers, need to copy and paste to see all
- Cannot see all 6 digits after update
- Cannot see ALL 6 numbers to log onto computer
- New phone transfer issues
- App did not transfer over to new phone
- QR code does not exist for new phone setup
- Won't let me transfer my account to a different phone
- Notifications are not working
- No notification sound
- No sound when notification comes up
- No sound with the notification
- Confirmations never come up, have to go into the app for codes
- App prompts to start without instructions, link, or QR code
- App did not transfer well and was unusable on new phone
- Cannot install application on telephone
- Poor migration, no way to migrate Authenticator app to a new device
- Doesn't work—won't scan any QR code’s
- Confirmation page doesn’t show immediately
- Crashes immediately upon launch
- Unable to remove tokens
- Push authorization no longer works, app just turns off
- Client won’t even open
- App doesn't launch
- Always crashes on startup
Requested features
12 requests- Allow account transfer to another phone
- Create a feature to transfer connected accounts to the same app on another phone
- Add watch capability
- Needs a watch version
- Add Apple Watch notification support
Show 7 moreShow fewer
- Restore Apple Watch approval
- Restore lock screen approval
- Add sound to notifications
- Allow users to see all 6 digits on iPhone
- Improve app startup process
- Provide instructions or QR code for initial setup
- Allow deletion of retired tokens
FIS Authenticator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Auth0 Guardian
No in-app purchases
FIS Authenticator
No in-app purchases
Questions
Is Auth0 Guardian free?
Is FIS Authenticator free?
Which has better reviews, Auth0 Guardian or FIS Authenticator?
Do Auth0 Guardian or FIS Authenticator have ads?
Which is updated more often, Auth0 Guardian or FIS Authenticator?
Other comparisons
