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Dato alternatives · Calendar

Open-source alternatives to Dato

Dato 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.

Dato is a paid product with a free trial, starting at $18 one-time purchase on the Mac App Store. 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 Dato

  1. Itsycal

    Free, tiny menu bar calendar for the Mac

    • Itsycal is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • Itsycal has a free plan. Dato does not, though it has a free trial.
    • Itsycal is open source, according to its own site.
    • Dato can be bought with a one-time purchase.
    Itsycal vs DatoItsycal pricing and details

  2. MeetingBar

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

    • MeetingBar is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • MeetingBar has a free plan. Dato does not, though it has a free trial.
    • MeetingBar is open source, according to its own site.
    • Dato can be bought with a one-time purchase.
    MeetingBar vs DatoMeetingBar pricing and details

  3. 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. Dato starts at $18 one-time purchase on the Mac App Store.
    • Proton Calendar has a free plan. Dato does not, though it has a free trial.
    • Only Proton Calendar lists a web app.
    • Only Proton Calendar lists Windows, Linux, iOS and Android apps.
    Proton Calendar pricing and details

  4. Tuta Calendar

    End-to-end encrypted calendar bundled with Tuta Mail

    • Tuta Calendar starts at €3 per month, paid yearly (€3.60 paid monthly). Dato starts at $18 one-time purchase on the Mac App Store.
    • Tuta Calendar has a free plan. Dato does not, though it has a free trial.
    • Only Tuta Calendar lists a web app.
    • Only Tuta Calendar lists Windows, Linux, iOS and Android apps.
    Tuta Calendar pricing and details

  5. Fossify Calendar

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

    • Fossify Calendar is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • Fossify Calendar has a free plan. Dato does not, though it has a free trial.
    • Only Fossify Calendar lists an Android app.
    • Only Dato lists a macOS app.
    Fossify Calendar pricing and details

  6. Etar

    Open-source Material Design calendar for Android

    • Etar is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • Etar has a free plan. Dato does not, though it has a free trial.
    • Only Etar lists an Android app.
    • Only Dato lists a macOS app.
    Etar pricing and details

  7. GNOME Calendar

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

    • GNOME Calendar is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • GNOME Calendar has a free plan. Dato does not, though it has a free trial.
    • Only GNOME Calendar lists a Linux app.
    • Only Dato lists a macOS app.
    GNOME Calendar pricing and details

  8. Merkuro Calendar

    Open-source calendar and task app from KDE for Linux

    • Merkuro Calendar is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • Merkuro Calendar has a free plan. Dato does not, though it has a free trial.
    • Only Merkuro Calendar lists a Linux app.
    • Only Dato lists a macOS app.
    Merkuro Calendar pricing and details

  9. Timeful

    Free, open-source group availability poll with calendar autofill

    • Timeful is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • Timeful has a free plan. Dato does not, though it has a free trial.
    • Only Timeful lists a web app.
    • Only Dato lists a macOS app.
    Timeful pricing and details

  10. 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). Dato starts at $18 one-time purchase on the Mac App Store.
    • Rallly has a free plan. Dato does not, though it has a free trial.
    • Only Rallly lists a web app.
    • Only Dato lists a macOS app.
    Rallly pricing and details

  11. Crab Fit

    Free, open-source availability heat map for group events

    • Crab Fit is free. Dato starts at $18 one-time purchase on the Mac App Store.
    • Crab Fit has a free plan. Dato does not, though it has a free trial.
    • Only Crab Fit lists a web app.
    • Only Crab Fit lists an Android app.
    Crab Fit pricing and details

Common questions

Is there an open-source alternative to Dato?

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

Is Dato open source?

Dato is not described as open source on its own site. The listing was checked on Oct 9, 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 Dato: the alternatives its listing names first, then the tools that share the most features with it.