# 2FA Authenticator (2FAS) vs Proton Calendar

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.

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 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 2FA Authenticator (2FAS) | Proton Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (36K ratings)](https://appshunter.io/ios/app/2fa-authenticator-2fas/id1217793794/reviews)** | [4.1 (1.6K ratings)](https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943/reviews) |
| Number of ratings | **36K** | 1.6K |
| Positive reviews | **77.3% of reviews** | 40.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | Free | Free |
| Size | 81 MB | 185 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Two Factor Authentication Service Inc.](https://appshunter.io/developer/1217793793) | [Proton AG](https://appshunter.io/developer/979659484) |

## What reviewers say

### 2FA Authenticator (2FAS)

[App page](https://appshunter.io/ios/app/2fa-authenticator-2fas/id1217793794)

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.

**Highlights:** 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

**Features:** Apple Watch app

**In-app purchases:** none

**What reviewers like**

- 🚀 Efficient and fast
- 🔒 Secure and private
- 👍 Simple and intuitive UI
- 💡 Customizable icons and folders
- 🔒 iCloud backup and sync

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 🔒 Lack of password/PIN protection
- 🕰 No Apple Watch app
- 🐛 Issues with push notifications
- 🕰 Missing desktop/web app

**Reported bugs**

- Tokens disappearing after device changes
- Push notification failures
- Incompatibility with older devices

**Requested features**

- Alphanumeric passcode option
- Custom icon uploads
- Apple Watch app
- Desktop/web app
- Improved support and communication


### 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


## Frequently asked questions

### Is 2FA Authenticator (2FAS) free?

2FA Authenticator (2FAS) is free to download, with no in-app purchases.

### Is Proton Calendar free?

Proton Calendar is free to download, with in-app purchases available.

### Which has better reviews, 2FA Authenticator (2FAS) or Proton Calendar?

2FA Authenticator (2FAS) is rated higher. 2FA Authenticator (2FAS) averages 4.7 out of 5 from 36K ratings, while Proton Calendar averages 4.1 from 1.6K ratings.

### Do 2FA Authenticator (2FAS) or Proton Calendar have ads?

Neither 2FA Authenticator (2FAS) nor Proton Calendar shows ads.

### Which is updated more often, 2FA Authenticator (2FAS) or Proton Calendar?

2FA Authenticator (2FAS) ships an update monthly, and Proton Calendar every 5 weeks. Most recently, 2FA Authenticator (2FAS) was updated on October 30, 2026 and Proton Calendar on October 29, 2026.

---

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