Comparison

Tuta Calendar vs Proton Authenticator & 2FA

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Tuta Calendar

This app offers a secure, end-to-end encrypted calendar to protect your privacy. It provides essential planning tools like recurring events and multiple views, with seamless integration for privacy-conscious users.

Highlights
  • Quantum-safe end-to-end encryption
  • Zero tracking and data sharing
  • Sync across mobile, web, and desktop
  • Recurring and external calendar sync
  • Multiple calendar views
  • Offline access
  • Secure event sharing
Read full description

PROTECT YOUR PRIVACY WITH TUTA CALENDAR – FREE, SECURE & ENCRYPTED PLANNER Take control of your schedule with Tuta Calendar, the world’s most secure calendar app, trusted by privacy-conscious users worldwide. With quantum-safe encryption, your events, reminders, and schedules stay private. Fast, open source, and free: Tuta Calendar is built with the highest security standards. Plus, it’s perfectly integrated with the Tuta Mail app. WHY CHOOSE TUTA CALENDAR? Stay Secure • Quantum-Safe Encryption: Your entire schedule, including event details and reminders, is fully end-to-end encrypted – only you can access it. • Zero Tracking: No ads, no profiling, no data sharing. Your calendars are yours. • Zero-Knowledge Architecture: We can’t see your events, meeting times, or attendees. Your schedule is invisible to us. • Secure Event Sharing: Share events securely with Tuta users or external calendars via password-protected invites. • GDPR-Compliant & Hosted in Germany: Protected by strict European privacy laws. Boost Your Productivity • Sync Across Devices: Your events instantly update on mobile, web, and desktop. • Recurring Events: Schedule daily, weekly, monthly, yearly, or custom repeating events. • Multiple Calendar Views: Easily switch between agenda, daily, 3-day, weekly, or monthly views. • External Calendar Sync: Subscribe to external calendars – updates happen automatically. • Unlimited Calendar Management (paid feature): Manage multiple calendars and toggle visibility effortlessly. • Offline Access: View and manage your schedule even without an internet connection. Simple & Intuitive • User-Friendly Interface: Modern, clean design with light and dark modes. • Quick Navigation: Create, edit, or delete events in just a few taps. • Smart Event Reminders: Get encrypted notifications to ensure you never miss an appointment. • Email Integration: Link calendar events directly to your Tuta Mail account for seamless scheduling. PRICING Tuta offers a free plan for everyone, plus premium plans with extra features, available monthly or yearly. Every subscription includes Tuta Mail and Tuta Calendar, seamlessly syncing across all your devices. • Free – Secure, encrypted email and calendar at no cost. • Revolutionary – 20 GB, unlimited calendars, calendar invites and sharing, custom domains, and more. • Legend – 500 GB, unlimited calendars, calendar invites and sharing, 30 email addresses, and advanced features. No matter which plan you choose, your communication remains end-to-end encrypted, private, and completely free from tracking. BONUS: GET TUTA MAIL WITH THE SAME ACCOUNT Your Tuta account gives you access to Tuta Mail, the encrypted email service with the same quantum-safe security as your calendar. One account, two essential privacy tools – completely free. WHO IS BEHIND TUTA? Freedom fighters committed to protecting freedom of speech and your right to privacy! • Developed & Hosted in Germany: Adheres to strict GDPR data protection laws. • Private by Design: We can’t access your data – secure password reset ensures your privacy. • End-to-End Encrypted from the Ground Up: Every event, contact, and reminder is encrypted by default. TRUSTED BY SECURITY EXPERTS "Tuta provides an exceptional level of security and privacy... If security is your priority, there’s not much better than Tuta." — TechRadar "Since Tuta is open source and has amazing products in development, I moved my email there." — Journalist Dan Arel "Tuta’s email security is unmatched. Its mobile apps are fast and user-friendly, with fair pricing and a free option." — CyberSynchs JOIN MILLIONS WHO TRUST TUTA Protect Your Schedule: Download Tuta Calendar today and join millions who trust us for secure, encrypted time management. Website: https://tuta.com Open Source Code: https://github.com/tutao/tutanota Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

About

Proton Authenticator & 2FA

Securely manage your two-factor authentication codes with an open-source, end-to-end encrypted authenticator app. It offers seamless cross-device syncing, effortless import from other apps, and robust backup options, all protected by strict Swiss privacy laws. Take control of your digital security with a trusted and private solution.

Highlights
  • End-to-end encrypted iCloud sync
  • Effortless import from other authenticators
  • Secure backup and export
  • Swiss privacy by design
  • Open source and transparent
  • Offline support
Features
Read full description

Get the authenticator trusted by millions — from Proton Mail, the world's largest encrypted email provider. Proton Authenticator is open source, end-to-end encrypted, and protected by strict Swiss privacy laws. Protect all your new accounts and strengthen security on your existing ones. Proton Authenticator keeps your 2FA codes secure, accessible, and completely private — with full control over where your data is stored. KEY FEATURES Local-First Storage:Your 2FA codes are stored entirely on your device, giving you complete control over your data. Effortless Import: Migrate from Google Authenticator, Authy, or any other app in seconds. Secure Backup & Export: Retain full control of your data with easy backup and restore options. Swiss Privacy by Design: Built under Switzerland's strongest data protection regulations. Open Source & Transparent: Auditable code. No tracking. No ads. Take control of your digital security with encryption you can trust. Free to use: No Proton account required, ad-free. Offline support: On mobile and desktop apps No other 2FA app provides this combination of security and privacy. Trusted by millions. Built by Proton. Take control of your digital security today. Terms of service: https://proton.me/legal/terms Learn more: https://proton.me

Screenshots

Tuta Calendar4 screens
Proton Authenticator & 2FA4 screens

Verdict

The call

The clearest difference is in-app purchases: Proton Authenticator & 2FA at none against Tuta Calendar's 4. Proton Authenticator & 2FA also leads on ratings volume (741 vs 168). On price, rating, review sentiment and update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Tuta Calendar sells 4 in-app purchases, starting at $3.99 per month. Proton Authenticator & 2FA asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Tuta Calendar against 4.6 for Proton Authenticator & 2FA. Both are backed by a comparable volume of ratings — 168 and 741 respectively. Written reviews split almost evenly too, at 58% and 58% positive.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. Both last shipped on November 8, 2026.

Scorecard3 real differences · 7 level
Tuta Calendar versus Proton Authenticator & 2FA: the parameters behind the verdict, then further details
ParameterTuta CalendarProton Authenticator & 2FA
PriceFreeFree
Rating4.6 (168 ratings)4.6 (741 ratings) — better
Positive reviews57.7% of reviews — better57.6% of reviews
Number of ratings168741 — better
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS16.0 — better17.0
Further details — not scored
Size46 MB120 MB
Age rating4+4+
DeveloperTutao GmbHProton AG

Customer experience

Tuta Calendar

All ratings168 ratings
Positive89.9%
Neutral3.0%
Negative7.1%
Written reviews71 reviews
Positive57.7%
Neutral14.1%
Negative28.2%

Proton Authenticator & 2FA

All ratings314 ratings
Positive82.8%
Neutral6.7%
Negative10.5%
Written reviews255 reviews
Positive57.6%
Neutral19.2%
Negative23.1%

User reviews

Tuta Calendar

From 168 App Store ratings

What we love

  • 🔒 Privacy and security focused
  • 👍 Streamlined and minimalist design
  • 🔄 Calendar subscriptions work well
  • ✨ Good color schemes and views
  • ✅ Private alternative to big tech

Room to improve

  • 🐛 Frequent crashes and bugs
  • ⚠️ Requires account/login
  • 📅 Widget not working/limited
  • ❌ No watch app support
  • ⏳ Slow loading/reloading events

Proton Authenticator & 2FA

From 741 App Store ratings

What we love

  • 🚀 Cross-platform support
  • 🔒 Secure cloud sync
  • 👍 Easy import from other authenticators
  • 🚀 Convenient 'next' feature for codes

Room to improve

  • 🐛 Buggy UI (scrolling jitters, random sorting)
  • 👎 Lack of customization options (pin favorites, change icons)
  • 🐛 Sync/login issues on iPad

Bugs and requests

Tuta Calendar

Reported bugs

19 issues
  • App crashes frequently
  • Widget is not working or is blank
  • Calendar events not saving or changes not saving
  • App logs out automatically and shows invalid credentials
  • Double reminders for appointments
Show 14 more
  • Lost important information/data
  • Calendar subscriptions duplicate entries
  • Cannot delete calendars or calendar subscriptions
  • Cryptic error messages
  • App constantly crashing on opening
  • Login issues
  • FaceID login not working for free accounts
  • Account creation issues (clock puzzle)
  • Search function doesn't work on app
  • Events from calendar subscriptions not syncing
  • App ignores OS font size settings
  • Issues with recurring events being duplicated
  • Calendar entries not visible without connection
  • Events reload every time the app opens

Requested features

31 requests
  • App for the Watch
  • Icon shows current date
  • Ability to see holidays marked
  • Import from Apple calendar
  • Adjustable app opening view (e.g., month view)
Show 26 more
  • Default appointment length setting
  • Color code appointments on the same calendar
  • Widget that shows more than one day
  • Widget that shows entire month
  • Ability to see monthly and agenda view simultaneously
  • Option to zoom/pinch time intervals
  • Move event blocks by dragging
  • Custom settings for specific days of the week
  • Week numbers displayed
  • Full-featured calendar
  • Option to open locations in other map apps
  • More customizability in UI
  • Better readability for low vision users
  • Adjustable text size respecting OS settings
  • More compact week view
  • Display more event details in month view
  • Quick access to distant calendar days
  • Emojis in events
  • Family planner in free tier
  • On-device notes/non-login option
  • Support for holidays by country/region
  • Dark mode option
  • Advanced analytics dashboard
  • Ability to expand week view to include more than 8 hours
  • Sync with other calendar apps
  • More robust search functionality on mobile app

Proton Authenticator & 2FA

Reported bugs

4 issues
  • Sync/login loop on iPad
  • 2FA input broken on non-iPhone devices
  • Screen strobing on iPad
  • Duplicate entries after import

Requested features

5 requests
  • PIN unlock for desktop
  • Alphabetical sorting option
  • Export function (not just Proton-specific backup)
  • Native macOS app
  • Option to hide item icons

In-app purchases

4 purchases

Tuta Calendar

Subscriptions4
  • Revolutionary (Monthly)$3.991 Month
  • Legend (Monthly)$9.991 Month
  • Revolutionary (Yearly)$39.991 Year
Show 1 more
  • Legend (Yearly)$99.991 Year
None

Proton Authenticator & 2FA

No in-app purchases

Questions

Is Tuta Calendar free?
Tuta Calendar is free to download, with in-app purchases available.
Is Proton Authenticator & 2FA free?
Proton Authenticator & 2FA is free to download, with no in-app purchases.
Which has better reviews, Tuta Calendar or Proton Authenticator & 2FA?
Proton Authenticator & 2FA is rated higher. Tuta Calendar averages 4.6 out of 5 from 168 ratings, while Proton Authenticator & 2FA averages 4.6 from 741 ratings.
Do Tuta Calendar or Proton Authenticator & 2FA have ads?
Neither Tuta Calendar nor Proton Authenticator & 2FA shows ads.
Which is updated more often, Tuta Calendar or Proton Authenticator & 2FA?
Tuta Calendar ships an update weekly, and Proton Authenticator & 2FA weekly. Most recently, Tuta Calendar was updated on November 8, 2026 and Proton Authenticator & 2FA on November 8, 2026.

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