# Proton Calendar privacy rating

End-to-end encrypted calendar from Proton for web, Android and iOS. Supports shared calendars, recurring events, time zones, ICS import and subscriptions, and integrates with Proton Mail.

## Summary

Proton Calendar scores 60 out of 100 (grade C) on the calendars criteria. It meets 1 of 4 criteria: no ads or data sales. It partly meets open source, no trackers or telemetry and independent audit. It is based in Switzerland: Not in the Five, Nine or Fourteen Eyes; GDPR-style data protection law.

- Website: https://proton.me/calendar
- Source code: https://github.com/ProtonMail/android-calendar
- License: GPL-3.0
- Jurisdiction: Switzerland. Not in the Five, Nine or Fourteen Eyes. GDPR-style data protection law.
- Home page trackers: none found
- Category: [Calendars](https://privacyratings.com/calendars/)
- Also rated: [Proton Mail](https://privacyratings.com/email-providers/protonmail/) (Email providers), [Proton Pass](https://privacyratings.com/password-managers/protonpass/) (Password managers), [Proton Authenticator](https://privacyratings.com/two-factor-authentication/proton-authenticator/) (Two-factor authentication), [Proton VPN](https://privacyratings.com/vpns/protonvpn/) (VPN providers), [Proton Docs](https://privacyratings.com/office-suites/proton-docs/) (Office suites), [Lumo](https://privacyratings.com/ai-assistants/lumo/) (AI assistants), [Proton Drive](https://privacyratings.com/cloud-storage/proton-drive/) (Encrypted cloud storage)
- Grade: C (60/100)

## Criteria

| Criterion | Answer | Note | Evidence |
| --- | --- | --- | --- |
| Open source | Partial | The web, Android and iOS apps are GPL-3.0. The server code is not published. | https://github.com/ProtonMail/WebClients/blob/main/LICENSE |
| No trackers or telemetry | Partial | No third-party trackers, but anonymous usage statistics and crash reports are sent by default and can be turned off. | https://proton.me/support/share-usage-statistics |
| No ads or data sales | Yes | Funded by paid plans. The privacy policy rules out targeted advertising and profiling. | https://proton.me/legal/privacy |
| Independent audit | Partial | Securitum published a full audit of the Proton Mail and Calendar web apps, but it is older than three years. | https://res.cloudinary.com/dbulfrlrz/images/v1707571626/wp-pme/securitum-protonmail-security-audit/securitum-protonmail-security-audit.pdf |

Source: https://privacyratings.com/calendars/proton-calendar/
Edit: https://github.com/privacyratings/privacyratings.com/edit/main/ratings/calendars/proton-calendar.md