Comparison

Proton Calendar vs Bitwarden Authenticator

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Bitwarden Authenticator

Generate time-based one-time passwords for two-factor authentication on any website or application. This tool provides an extra layer of security for your accounts, ensuring your identity is verified and sensitive data remains protected from unauthorized access.

Highlights
  • Generates 2FA verification codes
  • Supports TOTP for universal compatibility
  • Simple and intuitive interface
  • Adds an extra layer of protection
  • Backed by a trusted company
Features
Read full description

New from Bitwarden, provider of the password manager trusted by millions, Bitwarden Authenticator generates verification codes for two-factor authentication, ensuring your identity is verified when you log into accounts. Using industry-standards, Bitwarden Authenticator supports any website or application that uses TOTP. ADD AN EXTRA LAYER OF PROTECTION Generate verification codes to ensure your identity is verified, keeping your sensitive data out of reach of imposters. UNIVERSAL COMPATIBILITY Bitwarden Authenticator uses industry standard methods for verification code generation, so it will work with any website or application that utilizes time-based one-time passwords. EASY TO USE A simple, intuitive design and straightforward interface makes it easy to start incorporating authentication into your digital life Bitwarden empowers organizations to secure passwords, developer secrets, and passkeys. Visit Bitwarden.com to learn more about Bitwarden Password Manager, Bitwarden Secrets Manager and Bitwarden Passwordless.dev!

Screenshots

Proton Calendar4 screens
Bitwarden Authenticator4 screens

Verdict

The call

The clearest difference is rating: Proton Calendar at 4.1 against Bitwarden Authenticator's 3.4. Proton Calendar also leads on ratings volume (1.6K vs 96). Bitwarden Authenticator's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs every 5 weeks). On price, review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Proton Calendar sells 2 one-off in-app purchases. Bitwarden Authenticator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Proton Calendar holds the better App Store score, 4.1 against 3.4. That said, the two scores are not equally well evidenced: Proton Calendar has 1.6K ratings behind it against 96, so its average is the more settled of the two. Written reviews split almost evenly too, at 41% and 41% positive.

UpkeepUpdate frequency

Proton Calendar ships an update every 5 weeks, Bitwarden Authenticator fortnightly. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

Scorecard4 real differences · 6 level
Proton Calendar versus Bitwarden Authenticator: the parameters behind the verdict, then further details
ParameterProton CalendarBitwarden Authenticator
PriceFreeFree
Rating4.1 (1.6K ratings) — better3.4 (96 ratings)
Positive reviews40.7% of reviews40.8% of reviews — better
Number of ratings1.6K — better96
Update frequencyEvery 5 weeksFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015.0 — better
Further details — not scored
Size185 MB76 MB
Age rating4+4+
DeveloperProton AGBitwarden Inc

Customer experience

Proton Calendar

All ratings1,415 ratings
Positive71.1%
Neutral13.7%
Negative15.2%
Written reviews641 reviews
Positive40.7%
Neutral26.4%
Negative32.9%

Bitwarden Authenticator

All ratings95 ratings
Positive56.8%
Neutral11.6%
Negative31.6%
Written reviews157 reviews
Positive40.8%
Neutral22.3%
Negative36.9%

User reviews

Proton Calendar

From 1.6K App Store ratings

What 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

Bitwarden Authenticator

From 96 App Store ratings

What we love

  • 👍 Good start
  • 🚀 Supports export and import
  • 🔒 Backed by a trusted company
  • 💡 Dedicated authenticator app

Room to improve

  • 🐛 Crashes on launch
  • 🐛 Search function not working
  • 🐛 Backup not working as expected
  • 🐛 Compatibility issues with older devices

Bugs and requests

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

Bitwarden Authenticator

Reported bugs

3 issues
  • Search results showing placeholder codes
  • Backup not restoring codes after device restore
  • Crashes after app updates

Requested features

5 requests
  • Add icons for services
  • Allow rearranging of entries
  • Implement iCloud/cloud sync
  • Add Apple Watch support
  • Require biometric authentication on each app open

In-app purchases

2 purchases

Proton Calendar

One-time2
  • Mail Plus (1 year)$59.99
  • Proton Unlimited$149.99
None

Bitwarden Authenticator

No in-app purchases

Questions

Is Proton Calendar free?
Proton Calendar is free to download, with in-app purchases available.
Is Bitwarden Authenticator free?
Bitwarden Authenticator is free to download, with no in-app purchases.
Which has better reviews, Proton Calendar or Bitwarden Authenticator?
Proton Calendar is rated higher. Proton Calendar averages 4.1 out of 5 from 1.6K ratings, while Bitwarden Authenticator averages 3.4 from 96 ratings.
Do Proton Calendar or Bitwarden Authenticator have ads?
Neither Proton Calendar nor Bitwarden Authenticator shows ads.
Which is updated more often, Proton Calendar or Bitwarden Authenticator?
Proton Calendar ships an update every 5 weeks, and Bitwarden Authenticator fortnightly. Most recently, Proton Calendar was updated on November 7, 2026 and Bitwarden Authenticator on November 4, 2026.

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