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Cal.com alternatives · Calendar

Open-source alternatives to Cal.com

Cal.com is not described as open source on its own site. 11 of the 75 other calendar and scheduling apps in this directory are open source, according to their own sites.

Cal.com has a free plan. Paid plans start at $12 per user / month, billed yearly ($16 billed monthly). All of them are free or have a free plan.

11 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

How each one differs from Cal.com

  1. Rallly

    Open-source meeting polls for finding a time that suits a group

    • Rallly starts at $6 per seat / month, billed yearly ($10 billed monthly). Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists macOS, Windows, Linux, iOS and Android apps.
    • Only Cal.com lists a browser extension.
    • Rallly is open source, according to its own site.
    Rallly pricing and details

  2. Proton Calendar

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

    • Proton Calendar starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a browser extension.
    • Proton Calendar is open source and end-to-end encrypted, according to its own site.
    • Cal.com is self-hostable, according to its own site.
    Proton Calendar pricing and details

  3. Crab Fit

    Free, open-source availability heat map for group events

    • Crab Fit is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists macOS, Windows, Linux and iOS apps.
    • Crab Fit is open source, according to its own site.
    • Crab Fit also covers surveys.
    Crab Fit pricing and details

  4. Timeful

    Free, open-source group availability poll with calendar autofill

    • Timeful is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists macOS, Windows, Linux, iOS and Android apps.
    • Only Cal.com lists a browser extension.
    • Timeful is open source, according to its own site.
    Timeful pricing and details

  5. Tuta Calendar

    End-to-end encrypted calendar bundled with Tuta Mail

    • Tuta Calendar starts at €3 per month, paid yearly (€3.60 paid monthly). Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a browser extension.
    • Tuta Calendar is open source and end-to-end encrypted, according to its own site.
    • Cal.com is self-hostable, according to its own site.
    Tuta Calendar pricing and details

  6. Itsycal

    Free, tiny menu bar calendar for the Mac

    • Itsycal is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a web app.
    • Only Cal.com lists Windows, Linux, iOS and Android apps.
    • Only Cal.com lists a browser extension.
    Itsycal pricing and details

  7. MeetingBar

    Free Mac menu bar app that shows and joins your next meeting

    • MeetingBar is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a web app.
    • Only Cal.com lists Windows, Linux, iOS and Android apps.
    • Only Cal.com lists a browser extension.
    MeetingBar pricing and details

  8. Fossify Calendar

    Open-source Android calendar with no ads, tracking or account

    • Fossify Calendar is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a web app.
    • Only Cal.com lists macOS, Windows, Linux and iOS apps.
    • Only Cal.com lists a browser extension.
    Fossify Calendar pricing and details

  9. Etar

    Open-source Material Design calendar for Android

    • Etar is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a web app.
    • Only Cal.com lists macOS, Windows, Linux and iOS apps.
    • Only Cal.com lists a browser extension.
    Etar pricing and details

  10. GNOME Calendar

    Free, open-source calendar app for the GNOME desktop on Linux

    • GNOME Calendar is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a web app.
    • Only Cal.com lists macOS, Windows, iOS and Android apps.
    • Only Cal.com lists a browser extension.
    GNOME Calendar pricing and details

  11. Merkuro Calendar

    Open-source calendar and task app from KDE for Linux

    • Merkuro Calendar is free. Cal.com starts at $12 per user / month, billed yearly ($16 billed monthly).
    • Only Cal.com lists a web app.
    • Only Cal.com lists macOS, Windows, iOS and Android apps.
    • Only Cal.com lists a browser extension.
    Merkuro Calendar pricing and details

Common questions

Is there an open-source alternative to Cal.com?

Yes. Rallly, Proton Calendar, Crab Fit, Timeful, Tuta Calendar, Itsycal, MeetingBar, Fossify Calendar and 3 more are open source, according to their own sites.

Is Cal.com open source?

Cal.com is not described as open source on its own site. The listing was checked on Oct 4, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Oct 9, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Cal.com: the alternatives its listing names first, then the tools that share the most features with it.