Key4Friends vs 2FA Authenticator (2FAS)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Key4Friends
Easily and securely share access to doors with friends and family. Receive authorizations from the MobileKey app to open and close designated doors directly from your smartphone. Requires an internet connection for operation.
- Receive digital door keys
- Open and close authorized doors
- Secure key distribution
- Easy friend sharing
- Email and SMS verification
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Safe distribution of keys among friends has never been easier: the Key4Friends app receives keys which the owner wishes to share with you from the MobileKey app. The function is quickly explained: the owner of the door sends you an authorisation for one or more doors over the MobileKey web app. You can then open and close the doors concerned using the Key4Friends app. Key4Friends is quick, easy, safe and free to install. You will only be asked for your email during registration. We will then send you a code by text message to check registration. No password is required thanks to the distinct connection between the SIM card and the email address. Important: your smartphone needs to be connected to the Internet to open or close a door with the Key4Friends app. This means that there may be charges, depending on the contract with the operator. Don't worry, though – the amount of data sent is minimal. SimonsVoss Technologies GmbH hopes you have fun sharing keys safely and securely.
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
Screenshots
Verdict
The clearest difference is review sentiment: 2FA Authenticator (2FAS) at 77% against Key4Friends's 9%. 2FA Authenticator (2FAS) also leads on update cadence (monthly vs every 9 months) and iOS requirement (18.6 vs 26.0). 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.
Key4Friends ships an update every 9 months, 2FA Authenticator (2FAS) monthly. The most recent releases landed on October 10, 2026 and October 22, 2026 respectively.
| Parameter | Key4Friends | 2FA Authenticator (2FAS) |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.7 (36K ratings) — better |
| Positive reviews | 9.1% of reviews | 77.4% of reviews — better |
| Number of ratings | — | 36K — better |
| Update frequency | Every 9 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 26.0 | 18.6 — better |
| Further details — not scored | ||
| Size | 61 MB | 80 MB |
| Age rating | 4+ | 4+ |
| Developer | SimonsVoss Technologies GmbH | Two Factor Authentication Service Inc. |
Customer experience
Key4Friends
2FA Authenticator (2FAS)
Bugs and requests
Key4Friends
Not enough reviews yet to summarise bugs or 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
In-app purchases
Key4Friends
No in-app purchases
2FA Authenticator (2FAS)
No in-app purchases
Questions
Is Key4Friends free?
Is 2FA Authenticator (2FAS) free?
Do Key4Friends or 2FA Authenticator (2FAS) have ads?
Which is updated more often, Key4Friends or 2FA Authenticator (2FAS)?
Other comparisons
