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Howie alternatives · Calendar

Open-source alternatives to Howie

Howie 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.

Howie is a paid product with a free trial, starting at $25 per month for 1,250 shared workspace credits. 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 Howie

  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. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Proton Calendar has a free plan. Howie does not, though it has a free trial.
    • Only Proton Calendar lists macOS, Windows, Linux, iOS and Android apps.
    • Proton Calendar is open source and end-to-end encrypted, according to its own site.
    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). Howie starts at $25 per month for 1,250 shared workspace credits.
    • Rallly has a free plan. Howie does not, though it has a free trial.
    • Rallly is open source and self-hostable, according to its own site.
    • Howie also covers time blocking, booking links and AI agents.
    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). Howie starts at $25 per month for 1,250 shared workspace credits.
    • Tuta Calendar has a free plan. Howie does not, though it has a free trial.
    • Only Tuta Calendar lists macOS, Windows, Linux, iOS and Android apps.
    • Tuta Calendar is open source and end-to-end encrypted, according to its own site.
    Tuta Calendar pricing and details

  4. Itsycal

    Free, tiny menu bar calendar for the Mac

    • Itsycal is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Itsycal has a free plan. Howie does not, though it has a free trial.
    • Only Itsycal lists a macOS app.
    • Only Howie lists a web app.
    Itsycal pricing and details

  5. MeetingBar

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

    • MeetingBar is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • MeetingBar has a free plan. Howie does not, though it has a free trial.
    • Only MeetingBar lists a macOS app.
    • Only Howie lists a web app.
    MeetingBar pricing and details

  6. Fossify Calendar

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

    • Fossify Calendar is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Fossify Calendar has a free plan. Howie does not, though it has a free trial.
    • Only Fossify Calendar lists an Android app.
    • Only Howie lists a web app.
    Fossify Calendar pricing and details

  7. Etar

    Open-source Material Design calendar for Android

    • Etar is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Etar has a free plan. Howie does not, though it has a free trial.
    • Only Etar lists an Android app.
    • Only Howie lists a web app.
    Etar pricing and details

  8. GNOME Calendar

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

    • GNOME Calendar is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • GNOME Calendar has a free plan. Howie does not, though it has a free trial.
    • Only GNOME Calendar lists a Linux app.
    • Only Howie lists a web app.
    GNOME Calendar pricing and details

  9. Merkuro Calendar

    Open-source calendar and task app from KDE for Linux

    • Merkuro Calendar is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Merkuro Calendar has a free plan. Howie does not, though it has a free trial.
    • Only Merkuro Calendar lists a Linux app.
    • Only Howie lists a web app.
    Merkuro Calendar pricing and details

  10. Crab Fit

    Free, open-source availability heat map for group events

    • Crab Fit is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Crab Fit has a free plan. Howie does not, though it has a free trial.
    • Only Crab Fit lists an Android app.
    • Only Crab Fit lists a browser extension.
    Crab Fit pricing and details

  11. Timeful

    Free, open-source group availability poll with calendar autofill

    • Timeful is free. Howie starts at $25 per month for 1,250 shared workspace credits.
    • Timeful has a free plan. Howie does not, though it has a free trial.
    • 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 Howie?

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 Howie open source?

Howie is not described as open source on its own site. The listing was checked on Oct 6, 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 Howie: the alternatives its listing names first, then the tools that share the most features with it.