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SimplyBook.me alternatives · Calendar

Open-source alternatives to SimplyBook.me

SimplyBook.me 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.

SimplyBook.me has a free plan. Paid plans start at €11.9 per month, billed annually (€13.9 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 SimplyBook.me

  1. 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. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only Proton Calendar lists macOS, Windows and Linux apps.
    • Proton Calendar is open source and end-to-end encrypted, according to its own site.
    • Proton Calendar also covers calendar.
    Proton Calendar pricing and details

  2. 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). SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only SimplyBook.me lists iOS and Android apps.
    • Rallly is open source and self-hostable, according to its own site.
    • SimplyBook.me also covers booking links and reports.
    Rallly pricing and details

  3. Tuta Calendar

    End-to-end encrypted calendar bundled with Tuta Mail

    • Tuta Calendar starts at €3 per month, paid yearly (€3.60 paid monthly). SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only Tuta Calendar lists macOS, Windows and Linux apps.
    • Tuta Calendar is open source and end-to-end encrypted, according to its own site.
    • Tuta Calendar also covers calendar.
    Tuta Calendar pricing and details

  4. Itsycal

    Free, tiny menu bar calendar for the Mac

    • Itsycal is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only Itsycal lists a macOS app.
    • Only SimplyBook.me lists a web app.
    • Only SimplyBook.me lists iOS and Android apps.
    Itsycal pricing and details

  5. MeetingBar

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

    • MeetingBar is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only MeetingBar lists a macOS app.
    • Only SimplyBook.me lists a web app.
    • Only SimplyBook.me lists iOS and Android apps.
    MeetingBar pricing and details

  6. Fossify Calendar

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

    • Fossify Calendar is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only SimplyBook.me lists a web app.
    • Only SimplyBook.me lists an iOS app.
    • Fossify Calendar is open source, according to its own site.
    Fossify Calendar pricing and details

  7. Etar

    Open-source Material Design calendar for Android

    • Etar is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only SimplyBook.me lists a web app.
    • Only SimplyBook.me lists an iOS app.
    • Etar is open source, according to its own site.
    Etar pricing and details

  8. GNOME Calendar

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

    • GNOME Calendar is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only GNOME Calendar lists a Linux app.
    • Only SimplyBook.me lists a web app.
    • Only SimplyBook.me lists iOS and Android apps.
    GNOME Calendar pricing and details

  9. Merkuro Calendar

    Open-source calendar and task app from KDE for Linux

    • Merkuro Calendar is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only Merkuro Calendar lists a Linux app.
    • Only SimplyBook.me lists a web app.
    • Only SimplyBook.me lists iOS and Android apps.
    Merkuro Calendar pricing and details

  10. Crab Fit

    Free, open-source availability heat map for group events

    • Crab Fit is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only Crab Fit lists a browser extension.
    • Only SimplyBook.me lists an iOS app.
    • Crab Fit is open source and self-hostable, according to its own site.
    Crab Fit pricing and details

  11. Timeful

    Free, open-source group availability poll with calendar autofill

    • Timeful is free. SimplyBook.me starts at €11.9 per month, billed annually (€13.9 billed monthly).
    • Only SimplyBook.me lists iOS and Android apps.
    • Timeful is open source and self-hostable, according to its own site.
    • Timeful also covers calendar and surveys.
    Timeful pricing and details

Common questions

Is there an open-source alternative to SimplyBook.me?

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

Is SimplyBook.me open source?

SimplyBook.me is not described as open source on its own site. The listing was checked on Oct 5, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 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 SimplyBook.me: the alternatives its listing names first, then the tools that share the most features with it.