# Mercury Diagnostic App vs Authenticator App

The clearest difference is rating: Authenticator App at 5.0 against Mercury Diagnostic App's 3.0. Authenticator App also leads on update cadence (every 5 days vs every 11 months). Mercury Diagnostic App's advantage is iOS requirement (10.0 vs 16.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Authenticator App holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Mercury Diagnostic App ships an update every 11 months, Authenticator App every 5 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Mercury Diagnostic App | Authenticator App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/mercury-diagnostic-app/id1491041580/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/authenticator-app-twoauth/id6799068050/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 73 MB | 3 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Mercury Marine LLC](https://appshunter.io/developer/1777822540) | [Hangzhou JoyTime Technology Co., Ltd.](https://appshunter.io/developer/1562298447) |

## What reviewers say

### Mercury Diagnostic App

[App page](https://appshunter.io/ios/app/mercury-diagnostic-app/id1491041580)

This app allows Mercury dealer technicians to perform basic diagnostics on SmartCraft® engines. It provides live engine data, fault information, runtime history, and custom data lists. Full functionality requires a license key and a VesselView Mobile module.

**Highlights:** View live SmartCraft® engine data, Create custom data lists, Obtain active faults, View runtime history, Enter maintenance records, Wireless communication via Bluetooth

**Features:** Vision Pro support

**In-app purchases:** none


### Authenticator App

[App page](https://appshunter.io/ios/app/authenticator-app-twoauth/id6799068050)

This app generates verification codes for two-factor and multi-factor authentication. It offers a secure, offline experience with no data collection or ads, serving as a robust alternative to other authenticator apps.

**Highlights:** Fully offline operation, Private key storage, Zero data collection, Import accounts from Google Authenticator, Scan QR codes or enter keys manually, Instant code refresh with previews, Bulk export options

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Mercury Diagnostic App free?

Mercury Diagnostic App is free to download, with no in-app purchases.

### Is Authenticator App free?

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

### Which has better reviews, Mercury Diagnostic App or Authenticator App?

Authenticator App is rated higher. Mercury Diagnostic App averages 3.0 out of 5 from 1 ratings, while Authenticator App averages 5.0 from 1 ratings.

### Do Mercury Diagnostic App or Authenticator App have ads?

Neither Mercury Diagnostic App nor Authenticator App shows ads.

### Which is updated more often, Mercury Diagnostic App or Authenticator App?

Mercury Diagnostic App ships an update every 11 months, and Authenticator App every 5 days. Most recently, Mercury Diagnostic App was updated on November 5, 2026 and Authenticator App on November 6, 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.*