2FA Authenticator (2FAS) vs Viewer by SEPPmail
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
2FA Authenticator (2FAS)
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.
- 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
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2FAS is the easiest way to enable two-factor authentication (or multi-factor authentication) to verify your identity and securely log in to accounts to keep your personal data and passwords protected from cyber threats — all from one app, 100% free! The world’s most secure, private, and simple 2FA app. Secure: • Easily restore your tokens with backups. • Add app protection with your passcode or biometrics. • 2FAS is open-source, transparent, and community-driven. Simple: • 2FAS syncs across your mobile devices. • An interface designed for simplicity. • One-tap authentication with 2FAS Browser Extensions. • Multi-language support. • Quick guides for setup and support. Private: • 2FAS works offline. • 2FAS doesn't store any passwords or metadata. • 100% anonymous use, no account required. It’s not too late to protect your data, so what are you waiting for? Protect your online accounts and services now with TOTP and HOTP algorithms. Start using the 2FAS authenticator app today! If you have any questions, talk with us on our Discord server: https://discord.gg/q4cP6qh2g5 Learn more about 2FAS: • Check our GitHub repository: https://github.com/twofas • Visit our website at: https://2fas.com/ • Follow us on X: https://x.com/2FAS_com • Subscribe on YouTube: https://www.youtube.com/@2FAS
Viewer by SEPPmail
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.
- Receive encrypted emails
- Decrypt secure attachments
- Read secure email content
- Supports SEPPmail Appliance encryption
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Sie haben eine verschlüsselte E-Mail mit einem "secure-email.html" Anhang in Ihrer Mailbox ? Diese wurde durch jemanden mit einer SEPPmail Appliance verschlüsselt und an Sie versendet. Mit der SEPPmail Viewer-APP können Sie diese empfangen, entschlüsseln und lesen.
Screenshots
Verdict
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.
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.
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.
| Parameter | 2FA Authenticator (2FAS) | Viewer by SEPPmail |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (35K ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 77.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 35K — better | 1 |
| Update frequency | Monthly — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 18.6 | 12.4 — better |
| Further details — not scored | ||
| Size | 80 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Two Factor Authentication Service Inc. | SEPPmail AG |
Customer experience
2FA Authenticator (2FAS)
Viewer by SEPPmail
Bugs and requests
2FA Authenticator (2FAS)
Reported bugs
3 issues- Tokens disappearing after device changes
- Push notification failures
- Incompatibility with older devices
Requested features
5 requests- Alphanumeric passcode option
- Custom icon uploads
- Apple Watch app
- Desktop/web app
- Improved support and communication
Viewer by SEPPmail
Not enough reviews yet to summarise bugs or requests.
In-app purchases
2FA Authenticator (2FAS)
No in-app purchases
Viewer by SEPPmail
No in-app purchases
Questions
Is 2FA Authenticator (2FAS) free?
Is Viewer by SEPPmail free?
Which has better reviews, 2FA Authenticator (2FAS) or Viewer by SEPPmail?
Do 2FA Authenticator (2FAS) or Viewer by SEPPmail have ads?
Which is updated more often, 2FA Authenticator (2FAS) or Viewer by SEPPmail?
Other comparisons
