# Oracle Mobile Authenticator vs Msg Viewer Pro

The clearest difference is review sentiment: Msg Viewer Pro at 69% against Oracle Mobile Authenticator's 14%. Msg Viewer Pro also leads on rating (4.0 vs 2.6) and iOS requirement (12.0 vs 14.0). Oracle Mobile Authenticator's advantage is price (Free vs $4.99) and ratings volume (90 vs 4). On update cadence, ads, in-app purchases and device support there is nothing between them.

Oracle Mobile Authenticator is free to download; Msg Viewer Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Msg Viewer Pro holds the better App Store score, 4.0 against 2.6. That said, the two scores are not equally well evidenced: Oracle Mobile Authenticator has 90 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 14% of Oracle Mobile Authenticator's written reviews are positive against 69% of Msg Viewer Pro's.

Oracle Mobile Authenticator ships an update every 3 months, Msg Viewer Pro every 2 months. The most recent releases landed on September 25, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Oracle Mobile Authenticator | Msg Viewer Pro |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [2.6 (90 ratings)](https://appshunter.io/ios/app/oracle-mobile-authenticator/id835904829/reviews) | **[4.0 (4 ratings)](https://appshunter.io/ios/app/msg-viewer-pro/id1019539949/reviews)** |
| Number of ratings | **90** | 4 |
| Positive reviews | 14.1% of reviews | **69.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 4 MB | 8 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Oracle America, Inc.](https://appshunter.io/developer/284793707) | [群群 刘](https://appshunter.io/developer/687318257) |

## What reviewers say

### Oracle Mobile Authenticator

[App page](https://appshunter.io/ios/app/oracle-mobile-authenticator/id835904829)

Securely verify your identity with your mobile device. This app generates one-time passcodes for logins or sends push notifications for approval, adding a vital layer of security to online applications beyond standard username and password.

**Highlights:** Generate one-time passwords offline, Push notification approval, App protection with Touch ID or PIN, Setup via QR code, URL, or manual key, Support for multiple accounts, Generate OTP for other RFC 6238 compliant apps

**Features:** Vision Pro support

**In-app purchases:** none


### Msg Viewer Pro

[App page](https://appshunter.io/ios/app/msg-viewer-pro/id1019539949)

Easily view and manage Microsoft Outlook .msg, .oft, and .eml files, along with winmail.dat and .mht formats. Access messages, notes, contacts, and attachments with a simple, fast interface. Share, print, or preview files directly from your device.

**Highlights:** Open MSG, OFT, EML, Winmail.dat, MHT files, View messages, notes, contacts, attachments, Preview and share attachments, Add files via iTunes File Sharing, Share or open documents with other apps, Print documents, Dark mode support

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✅ Opens .msg files reliably on Mac
- 👍 User-friendly and simple interface
- 💰 Affordable one-time purchase ($4.99-$5)
- 📎 Handles attachments well
- 🔄 Works across Mac, iPhone, and iPad

**What reviewers complain about**

- 🐛 Frequent crashes on various macOS versions
- 🐛 Crashes especially with large files and attachments
- ⚠️ Performance issues with large .mbox files (8.5GB+)
- 🖼️ Inline images don't render correctly
- 🖼️ Images appear as attachments instead of embedded

**Reported bugs**

- App crashes repeatedly when opening certain messages
- Crashes when closing emails within the app
- M1/M1 Pro/Max compatibility issues
- Memory management problems with large files
- Search crashes on large archives

**Requested features**

- Dark mode and light mode options
- Drag and drop functionality
- More powerful search commands
- Integration with third-party search tools (HoudahSpot)
- Direct export from .oft to .emltpl format


## Frequently asked questions

### Is Oracle Mobile Authenticator free?

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

### Is Msg Viewer Pro free?

Msg Viewer Pro costs $4.99, with no in-app purchases.

### Which has better reviews, Oracle Mobile Authenticator or Msg Viewer Pro?

Msg Viewer Pro is rated higher. Oracle Mobile Authenticator averages 2.6 out of 5 from 90 ratings, while Msg Viewer Pro averages 4.0 from 4 ratings.

### Do Oracle Mobile Authenticator or Msg Viewer Pro have ads?

Neither Oracle Mobile Authenticator nor Msg Viewer Pro shows ads.

### Which is updated more often, Oracle Mobile Authenticator or Msg Viewer Pro?

Oracle Mobile Authenticator ships an update every 3 months, and Msg Viewer Pro every 2 months. Most recently, Oracle Mobile Authenticator was updated on September 25, 2026 and Msg Viewer Pro on September 22, 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.*