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Fantastical vs Proton Calendar

Price, platforms and features side by side. The table says where each price was read and when.

Fantastical

Calendar and tasks app for Apple devices and Windows

Free plan · from $4.75/mo

Proton Calendar

End-to-end encrypted calendar from the maker of Proton Mail

Free plan · from $3.99/mo

Where they differ

  • Fantastical starts at $4.75 per month, billed annually ($6.99 billed monthly). Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly.
  • Only Proton Calendar lists a web app.
  • Only Proton Calendar lists Linux and Android apps.
  • Proton Calendar is open source and end-to-end encrypted, according to its own site.
  • Fantastical also covers templates, tasks and natural-language input.
In commonFree planmacOSWindowsiOSCalendarBooking links

At a glance

FantasticalProton Calendar
PricingFree planFree plan
Starts at$4.75 per month, billed annually ($6.99 billed monthly)$3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly
Free planAdd accounts, events and tasks, with day-to-year views and home screen widgets. Limited to 1 calendar set, 1 invitee per event and a 3-day weather forecast.Proton Free: 3 personal calendars with end-to-end encryption and event invitations. No calendar sharing or booking pages, and the desktop app is a 14-day trial.
Free trial14-day free trial of Flexibits PremiumNone listed
Web
macOS
Windows
Linux
iOS
Android
Made byFlexibits Inc.Proton AG
Price read fromflexibits.comproton.me
CheckedOct 4, 2026Oct 5, 2026

Who each one suits

Fantastical

  • People with Google, iCloud and Microsoft calendars who want them in one app
  • Adding events quickly by typing a sentence
  • Households sharing one subscription across up to 5 members

Proton Calendar

  • People who want event details kept unreadable to the provider
  • Existing Proton Mail users who want invitations handled in the inbox
  • Privacy-focused organizations standardizing on Proton's business suite

Worth knowing

Fantastical

  • No Android app or web version is listed; it runs on Mac, Windows, iPhone, iPad, Apple Watch and Apple Vision Pro.
  • The free version allows 1 invitee per event, 1 calendar set and a 3-day weather forecast.
  • Apple Watch support, push sync, travel time, templates and conference-call detection all need Flexibits Premium.
  • Single sign-on and Openings with multiple hosts are limited to the Team plan.

Proton Calendar

  • Proton Free allows 3 personal calendars; Mail Plus and higher plans allow 25.
  • Calendar sharing and booking pages need a paid plan, and Mail Plus and Proton Unlimited include only 1 booking page.
  • Calendar has no subscription of its own: paid features come with Mail Plus, Proton Unlimited or a business plan.
  • Desktop use is through the Proton Mail app for Mac, Windows and Linux, a 14-day trial on free accounts; the Linux app is labeled beta.

Key features

Fantastical

Natural-language event entry
Create events and tasks by typing a plain-language sentence instead of filling in a form field by field.
Day, week, month, quarter and year views
Full-screen views at every scale plus the DayTicker strip, all included in the free version.
Tasks next to events
Tasks from iCloud Reminders, Todoist and Google Tasks appear alongside calendar events on both free and paid tiers.
Openings and Proposals
Premium adds Openings, which let others book a slot from your availability, and Proposals, which poll invitees on meeting times.
Conference call detection
Premium detects Zoom, Google Meet, Microsoft Teams and Webex links in events and adds a single-click Join button.
Calendar sets
Group calendars into sets. Free allows 1 set; Premium allows unlimited sets, syncs them and can switch sets automatically by time or location.

Proton Calendar

End-to-end encrypted events
An event's title, description, location and attendees are encrypted on your device. Events received from people on other calendar services are stored with zero-knowledge encryption.
Appointment booking pages
Publish a booking page that shows only the times you choose and syncs with your calendars to prevent double bookings. Confirmed meetings can include a Proton Meet link. Paid plans only.
Calendar sharing
On paid plans, share a calendar by link or by inviting people directly, showing either full event details or only your availability.
Works with Proton Mail
Send invitations from a Proton Mail address, manage them without leaving the inbox, and add events received by email, such as flights or meetings, to the calendar.
Recurring events and reminders
Events can repeat daily, weekly, monthly or on a custom pattern, with several reminders or email alerts each. Views switch between day, week and month.
Import and calendar subscriptions
The Easy Switch tool imports existing calendars from other providers, and you can subscribe to calendars that other people keep on a different service.

Plans

Fantastical

  • Free$0

    Basic calendar and tasks with full-screen views; 1 calendar set, 1 invitee per event and a 3-day forecast.

  • Individual$4.75

    per month, billed annually ($6.99 billed monthly)

    All Premium features for one person, including Openings, Proposals, call detection and Apple Watch support.

  • Family$7.50

    per month, billed annually ($10.49 billed monthly)

    Flexibits Premium shared by up to 5 family members.

  • Team$4.75

    per user / month, billed annually ($6.99 billed monthly)

    Premium for each member, plus single sign-on, team roles and Openings with multiple hosts.

Proton Calendar

  • Proton Free$0

    3 personal calendars, end-to-end encryption, and sending and receiving invitations.

  • Mail Plus$3.99

    per month, billed every 12 months ($47.88); $4.99 billed monthly

    25 personal calendars, calendar sharing and 1 booking page, plus 15 GB of storage and 10 email addresses.

  • Proton Unlimited$9.99

    per month, billed every 12 months ($119.88); $12.99 billed monthly

    The same calendar features as Mail Plus, bundled with 500 GB of storage and Proton's VPN, password manager and cloud storage.

  • Workspace Standard$12.99

    per user / month, billed every 12 months ($155.88)

    Business suite with 25 calendars and 25 booking pages per user, 1 TB of storage per user and 15 custom email domains.

  • Workspace Premium$19.99

    per user / month, billed every 12 months ($239.88)

    Everything in Workspace Standard, plus 3 TB of storage per user, 20 custom email domains and data retention policies.

  • EnterpriseCustom

    All Proton services in a customizable package with a dedicated account manager; priced through sales.

Ways to pay less

Fantastical

  • Annual discount

    About 32% less with yearly billing

    Flexibits' pricing page lists the Individual plan at $4.75 a month billed annually, against $6.99 billed monthly, which works out about 32% lower.

  • Education

    Educational and military discount

    Flexibits says it offers an educational or military discount on request. Contact the company with proof of your institution, student status or military service.

  • Other savings

    Family plan for up to 5 members

    The Family plan shares Flexibits Premium among up to 5 members at a reduced price compared with separate Individual subscriptions.

Proton Calendar

  • Annual discount

    20% off Mail Plus on the 12-month plan

    Proton's pricing page lists Mail Plus at $3.99 a month when billed every 12 months ($47.88), against $4.99 billed monthly. Proton Unlimited is $9.99 instead of $12.99.

  • Education

    Student discount for the first 12 months

    Students verified through Student Beans get 50% off Mail Plus and 62% off Proton Unlimited for the first 12 months; the plan then renews at the regular price.

  • Nonprofit

    Reduced pricing for registered nonprofits

    Registered nonprofits can request discounted pricing on Proton's business plans from the sales team. No fixed percentage is published.

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