# Proton Calendar vs Bitwarden Authenticator

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.

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

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.

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.

## The numbers

| Metric | Proton Calendar | Bitwarden Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (1.6K ratings)](https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943/reviews)** | [3.4 (96 ratings)](https://appshunter.io/ios/app/bitwarden-authenticator/id6497335175/reviews) |
| Number of ratings | **1.6K** | 96 |
| Positive reviews | 40.7% of reviews | **40.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 185 MB | 76 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Proton AG](https://appshunter.io/developer/979659484) | [Bitwarden Inc](https://appshunter.io/developer/1137397743) |

## What reviewers say

### Proton Calendar

[App page](https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943)

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:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mail Plus (1 year) | $59.99 | one-time |
| Proton Unlimited | $149.99 | one-time |

**What reviewers like**

- 🚀 Intuitive interface
- 🔒 Secure and private
- 👍 Good integration with Proton suite
- 👍 Visually appealing design

**What reviewers complain about**

- 🐛 Slow performance and crashes
- 🔍 Lacking search functionality
- 📅 Missing advanced calendar views (week, month)
- 🔗 Limited integration with other calendars

**Reported bugs**

- Issues with time zone settings
- Notifications not working reliably
- Inability to edit shared events

**Requested features**

- 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

[App page](https://appshunter.io/ios/app/bitwarden-authenticator/id6497335175)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- Search results showing placeholder codes
- Backup not restoring codes after device restore
- Crashes after app updates

**Requested features**

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


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*