2FA Authenticator (2FAS) vs Proton Calendar
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
Proton Calendar
This app helps you manage your schedule with privacy in mind. It offers various viewing options, reminders, and recurring event creation. All your data is protected by end-to-end encryption and strict Swiss privacy laws, ensuring your personal information is not tracked or harvested.
- Agenda and day view
- View and reply to invites
- Automatic event addition from email
- Light and dark mode
- Multiple reminders
- Recurring events
- Cross-device sync
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A calendar is a record of your life: Proton Calendar helps keep it private. Make the most of your time - See your upcoming events as you like with agenda or day view - View and reply to invites - Events and invites are automatically added to your calendar from your Proton Mail inbox - View your schedule in light or dark mode - Add multiple reminders for your events - Create recurring events on a daily, weekly, monthly, yearly, or custom basis - Keep your calendar in sync across all your devices Private by default - No ads, no trackers, and no data harvesting - We can’t spy on your calendar or misuse your data - Protected by the same end-to-end encryption used in Proton Mail - Event names, descriptions, and participants are stored with zero-access encryption - Based in Switzerland, all your data is protected by strict Swiss privacy laws People before profits - Funded by users, not advertisers — Privacy is our business model - Built by scientists and engineers who met at CERN and MIT and founded Proton Mail - Used by high-profile journalists and organizations globally What others say about Proton: “Proton has now made it stupid-easy to encrypt your schedule. Information about what you plan to do, where, and with whom, can be just as sensitive as the messages you send and receive.” Gizmodo Follow Proton on social media for all the latest news and offers: Facebook: /proton Twitter/X: @protonprivacy Reddit: /protonmail Instagram: /protonprivacy EULA: http://www.apple.com/legal/itunes/appstore/dev/stdeula
Screenshots
Verdict
The clearest difference is rating: 2FA Authenticator (2FAS) at 4.7 against Proton Calendar's 4.1. 2FA Authenticator (2FAS) also leads on review sentiment (77% vs 41%) and in-app purchases (none vs 2). Proton Calendar's advantage is iOS requirement (16.0 vs 18.6). On price, update cadence, ads 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. Proton Calendar sells 2 one-off in-app purchases. 2FA Authenticator (2FAS) asks for nothing beyond the download.
2FA Authenticator (2FAS) holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: 2FA Authenticator (2FAS) has 36K ratings behind it against 1.6K, so its average is the more settled of the two. Written reviews point the same way: 77% of 2FA Authenticator (2FAS)'s written reviews are positive against 41% of Proton Calendar's.
2FA Authenticator (2FAS) ships an update monthly, Proton Calendar every 5 weeks. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.
| Parameter | 2FA Authenticator (2FAS) | Proton Calendar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (36K ratings) — better | 4.1 (1.6K ratings) |
| Positive reviews | 77.3% of reviews — better | 40.7% of reviews |
| Number of ratings | 36K — better | 1.6K |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 18.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 81 MB | 185 MB |
| Age rating | 4+ | 4+ |
| Developer | Two Factor Authentication Service Inc. | Proton AG |
Customer experience
2FA Authenticator (2FAS)
Proton Calendar
User reviews
2FA Authenticator (2FAS)
From 36K App Store ratingsWhat we love
- 🚀 Efficient and fast
- 🔒 Secure and private
- 👍 Simple and intuitive UI
- 💡 Customizable icons and folders
- 🔒 iCloud backup and sync
Room to improve
- 🐛 Occasional bugs and crashes
- 🔒 Lack of password/PIN protection
- 🕰 No Apple Watch app
- 🐛 Issues with push notifications
- 🕰 Missing desktop/web app
Proton Calendar
From 1.6K App Store ratingsWhat we love
- 🚀 Intuitive interface
- 🔒 Secure and private
- 👍 Good integration with Proton suite
- 👍 Visually appealing design
Room to improve
- 🐛 Slow performance and crashes
- 🔍 Lacking search functionality
- 📅 Missing advanced calendar views (week, month)
- 🔗 Limited integration with other calendars
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
Proton Calendar
Reported bugs
3 issues- Issues with time zone settings
- Notifications not working reliably
- Inability to edit shared events
Requested features
5 requests- Widgets for quick access
- Ability to invite and share calendars with others
- Support for importing/exporting calendar data
- Customization options (colors, alerts, etc.)
- iPad-optimized version
In-app purchases
2FA Authenticator (2FAS)
No in-app purchases
Proton Calendar
- Mail Plus (1 year)$59.99
- Proton Unlimited$149.99
Questions
Is 2FA Authenticator (2FAS) free?
Is Proton Calendar free?
Which has better reviews, 2FA Authenticator (2FAS) or Proton Calendar?
Do 2FA Authenticator (2FAS) or Proton Calendar have ads?
Which is updated more often, 2FA Authenticator (2FAS) or Proton Calendar?
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