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Head-to-head · Calendar Apps

Nextcloud Calendar vs Proton Calendar

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Nextcloud Calendar #5 in Calendar Apps 8.9/10 Free plan Free plan✓ 3 of 4 features Visit Nextcloud
Proton Calendar #6 in Calendar Apps 8.8/10 Free plan Free plan✓ 3 of 4 features Try Proton Calendar

Nextcloud Calendar leads on 0 checks, Proton Calendar on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreNextcloud Calendar · 8.9/10
  • Free planboth

Nextcloud Calendar scores higher on our rubric for calendar apps: 8.9 against 8.8 out of 10; our editors rank them #5 and #6.

On calendar sync, Nextcloud Calendar gives you Two_way where Proton Calendar offers One_way.

Nextcloud Calendar is the better fit for self-hosting teams needing collaborative scheduling. Proton Calendar is the better fit for privacy-focused users wanting free scheduling.

  • Nextcloud Calendar fits best

    Self-hosting teams needing collaborative scheduling

  • Proton Calendar fits best

    Privacy-focused users wanting free scheduling

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Side by side

Feature Nextcloud Calendar 8.9/10 Visit ↗ Proton Calendar 8.8/10 Visit ↗
At a glance
Editor score 8.9 8.8
Ranking #5 in Calendar Apps #6 in Calendar Apps
Best for Self-hosting teams needing collaborative scheduling Privacy-focused users wanting free scheduling
Pricing model Free plan + paid Free plan + paid
Starting price €42/user/yr —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Desktop, Mobile
Platforms Web, iOS, Android, Windows, macOS, Linux Web, Windows, macOS, Linux, iOS, Android
Support Email, Phone, Community, Docs Email, Live chat, Docs
Compliance GDPR, SSO/SAML, 2FA GDPR
Integrations 600+ integrations 6 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Nextcloud Calendar 3/4 · Proton Calendar 3/4
Shared calendars ✓ ✓
Time blocking Not checked yet Not checked yet
Scheduling links ✓ ✓
Video meeting support ✓ ✓
Specs
Calendar sync Two_way One_way
Mobile apps Ios and android Ios and android
Our review
Pros
  • Open-source calendar with self-hosted deployment
  • Sharing, invitations, free/busy planning, and booking links
  • Integrates with Nextcloud Contacts, Tasks, Talk, CalDAV, and iCalendar
  • End-to-end encryption for calendar events
  • Free plan includes recurring events and invitations
  • Booking pages, sharing, and Proton Meet links
Cons
  • Paid Enterprise subscriptions start at 100 users
  • No time-blocking feature
  • Mobile access relies on CalDAV-supported calendar workflows
  • External calendar synchronization is one-way
  • Narrower integration set than general-purpose calendars
  • Calendar is bundled with Proton Mail plans
Our verdict

Nextcloud Calendar is an open-source calendar app for Nextcloud instances, aimed at individuals and teams that need shared scheduling with control over deployment. It supports multiple calendars, event management, recurring events,…

Read the review →

Proton Calendar is an encrypted calendar service for individuals, families, and teams that want private event management. It supports event creation, recurring schedules, reminders, invitations, sharing, external calendar subscriptions,…

Read the review →
  1. Nextcloud CalendarCalendar Apps 8.9Free plan
  2. Proton CalendarCalendar Apps 8.8Free plan

Strengths and trade-offs

  • Nextcloud Calendar — where it wins

    • Open-source calendar with self-hosted deployment
    • Sharing, invitations, free/busy planning, and booking links
    • Integrates with Nextcloud Contacts, Tasks, Talk, CalDAV, and iCalendar

    Where it doesn't

    • Paid Enterprise subscriptions start at 100 users
    • No time-blocking feature
    • Mobile access relies on CalDAV-supported calendar workflows

  • Proton Calendar — where it wins

    • End-to-end encryption for calendar events
    • Free plan includes recurring events and invitations
    • Booking pages, sharing, and Proton Meet links

    Where it doesn't

    • External calendar synchronization is one-way
    • Narrower integration set than general-purpose calendars
    • Calendar is bundled with Proton Mail plans

More comparisons

All calendar apps comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update