# 2FA Authenticator (2FAS) vs Viewer by SEPPmail

The clearest difference is review sentiment: 2FA Authenticator (2FAS) at 78% against Viewer by SEPPmail's 0%. 2FA Authenticator (2FAS) also leads on rating (4.7 vs 1.0) and update cadence (monthly vs every 13 months). Viewer by SEPPmail's advantage is iOS requirement (12.4 vs 18.6). On price, ads, in-app purchases and monetization model there is nothing between them.

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

2FA Authenticator (2FAS) holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: 2FA Authenticator (2FAS) has 35K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 78% of 2FA Authenticator (2FAS)'s written reviews are positive against 0% of Viewer by SEPPmail's.

2FA Authenticator (2FAS) ships an update monthly, Viewer by SEPPmail every 13 months. The most recent releases landed on September 30, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | 2FA Authenticator (2FAS) | Viewer by SEPPmail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (35K ratings)](https://appshunter.io/ios/app/2fa-authenticator-2fas/id1217793794/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/viewer-by-seppmail/id6446402452/reviews) |
| Number of ratings | **35K** | 1 |
| Positive reviews | **77.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 13 months |
| Monetization | Free | Free |
| Size | 80 MB | 19 MB |
| Requires iOS | 18.6 | **12.4** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Two Factor Authentication Service Inc.](https://appshunter.io/developer/1217793793) | [SEPPmail AG](https://appshunter.io/developer/586785754) |

## What reviewers say

### 2FA Authenticator (2FAS)

[App page](https://appshunter.io/ios/app/2fa-authenticator-2fas/id1217793794)

Securely log in to your online accounts with two-factor authentication. This app protects your personal data and passwords from cyber threats with a simple, private, and open-source solution. It offers easy token restoration, app protection, and offline functionality.

**Highlights:** Two-factor authentication, Token backup and restore, App protection with passcode/biometrics, Open-source and transparent, Offline functionality, Cross-device sync, One-tap authentication with browser extensions

**Features:** Apple Watch app

**In-app purchases:** none

**What reviewers like**

- 🚀 Efficient and fast
- 🔒 Secure and private
- 👍 Simple and intuitive UI
- 💡 Customizable icons and folders
- 🔒 iCloud backup and sync

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🔒 Lack of password/PIN protection
- 🕰 No Apple Watch app
- 🐛 Issues with push notifications
- 🕰 Missing desktop/web app

**Reported bugs**

- Tokens disappearing after device changes
- Push notification failures
- Incompatibility with older devices

**Requested features**

- Alphanumeric passcode option
- Custom icon uploads
- Apple Watch app
- Desktop/web app
- Improved support and communication


### Viewer by SEPPmail

[App page](https://appshunter.io/ios/app/viewer-by-seppmail/id6446402452)

This application allows you to receive, decrypt, and read secure emails with "secure-email.html" attachments. It is designed for users who have received encrypted messages sent via a SEPPmail Appliance.

**Highlights:** Receive encrypted emails, Decrypt secure attachments, Read secure email content, Supports SEPPmail Appliance encryption

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

**In-app purchases:** none


## Frequently asked questions

### Is 2FA Authenticator (2FAS) free?

2FA Authenticator (2FAS) is free to download, with no in-app purchases.

### Is Viewer by SEPPmail free?

Viewer by SEPPmail is free to download, with no in-app purchases.

### Which has better reviews, 2FA Authenticator (2FAS) or Viewer by SEPPmail?

2FA Authenticator (2FAS) is rated higher. 2FA Authenticator (2FAS) averages 4.7 out of 5 from 35K ratings, while Viewer by SEPPmail averages 1.0 from 1 ratings.

### Do 2FA Authenticator (2FAS) or Viewer by SEPPmail have ads?

Neither 2FA Authenticator (2FAS) nor Viewer by SEPPmail shows ads.

### Which is updated more often, 2FA Authenticator (2FAS) or Viewer by SEPPmail?

2FA Authenticator (2FAS) ships an update monthly, and Viewer by SEPPmail every 13 months. Most recently, 2FA Authenticator (2FAS) was updated on September 30, 2026 and Viewer by SEPPmail on August 24, 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.*