Proton Calendar
by Proton Calendar · Encrypted calendar from a Swiss-based provider
47.2 — BenchRank score out of 100
Screenshots of Proton Calendar
Homepage
Overview
Proton Calendar is an encrypted calendar service from Proton AG, based in Geneva. Event titles, descriptions, locations and invitee lists are encrypted end-to-end, while events received from people using other calendars are secured with zero-knowledge encryption. It updates your availability automatically for booking, and pairs with Proton Mail to send invitations and add events from the inbox.
- Best for
- People and businesses wanting a calendar whose event details are encrypted and held in Switzerland.
- Pricing
- The captured page shows no prices — it offers a free account and links to a separate pricing page.
- Runs on
- iOSAndroid
Strengths and trade-offs
Strengths
- Event title, description, location and invitees encrypted
- Swiss company, so data falls under Swiss privacy law
- Free account available, with a separate business offering
- Availability updates automatically for meeting booking
Trade-offs
- Captured page shows no prices for personal or business plans
- Full benefit depends on also using a Proton Mail address
- Events from other calendars get zero-knowledge, not end-to-end, encryption
- Page lists no specific features or third-party integrations
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
- MCP support
- 80 out of 100
- API quality
- 0 out of 100
- Documentation
- 0 out of 100
- Agent friendliness
- 70 out of 100
- Pricing transparency
- 85 out of 100
- Customer sentiment
- 80 out of 100
- Changelog
- 0 out of 100
- Marketing site structure
- 75 out of 100
- Operational trust
- 50 out of 100
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
- Openness
- 0 out of 100
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