# Proton Calendar vs EteSync Notes

The clearest difference is review sentiment: EteSync Notes at 100% against Proton Calendar's 41%. EteSync Notes also leads on in-app purchases (none vs 2) and update cadence (weekly vs every 5 weeks). Proton Calendar's advantage is rating (4.1 vs 3.0) and ratings volume (1.6K vs 2). On price, ads, monetization model and device support there is nothing between them.

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

Proton Calendar holds the better App Store score, 4.1 against 3.0. That said, the two scores are not equally well evidenced: Proton Calendar has 1.6K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 41% of Proton Calendar's written reviews are positive against 100% of EteSync Notes's, so the app with the better star average is not the one people write more warmly about.

Proton Calendar ships an update every 5 weeks, EteSync Notes weekly. The most recent releases landed on October 25, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Proton Calendar | EteSync Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (1.6K ratings)](https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/etesync-notes/id1533806351/reviews) |
| Number of ratings | **1.6K** | 2 |
| Positive reviews | 40.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 185 MB | 21 MB |
| Requires iOS | 16.0 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Proton AG](https://appshunter.io/developer/979659484) | [EteSync Ltd](https://appshunter.io/developer/1489574284) |

## 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


### EteSync Notes

[App page](https://appshunter.io/ios/app/etesync-notes/id1533806351)

This app offers a secure and private note-taking experience. It features a change journal for data history, allowing you to restore or revert to past versions. An EteSync account is required, which can be hosted on a free, open-source server.

**Highlights:** Secure and privacy-respecting, Open-source client and server, Full data history and change journal, Easy to use with credentials, Data restoration and versioning

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Proton Calendar free?

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

### Is EteSync Notes free?

EteSync Notes is free to download, with no in-app purchases.

### Which has better reviews, Proton Calendar or EteSync Notes?

Proton Calendar is rated higher. Proton Calendar averages 4.1 out of 5 from 1.6K ratings, while EteSync Notes averages 3.0 from 2 ratings.

### Do Proton Calendar or EteSync Notes have ads?

Neither Proton Calendar nor EteSync Notes shows ads.

### Which is updated more often, Proton Calendar or EteSync Notes?

Proton Calendar ships an update every 5 weeks, and EteSync Notes weekly. Most recently, Proton Calendar was updated on October 25, 2026 and EteSync Notes on September 26, 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.*