Proton Calendar
by Proton Calendar · Encrypted calendar from a Swiss-based provider
BenchRank score
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 Proton Calendar markets itself
A structured read of the promise, proof and page design on Proton Calendar’s captured homepage.
Homepage capture
“Your schedule is worth protecting”
- Angle: Security / trust-led
- Hero: Product screenshot
Pricing
Published plans and prices from Proton Calendar’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Pricing transparency
Whether real prices are published, self-serve signup exists, and usage costs are knowable without a sales call.
Customer sentiment
Third-party ratings, shrunk toward the catalogue mean by review volume and corroborated across independent sources.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
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
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
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Where this comes from
The Proton Calendar pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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Is this your product?
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