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Fossify Calendar alternatives

Fossify Calendar compared with 5 alternatives: Etar, Proton Calendar, Tuta Calendar, Google Calendar and aCalendar.

Fossify Calendar is free to use. All 5 alternatives are free or have a free plan.

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

At a glance

ToolPriceFree planRuns on
Fossify CalendarThis toolFreeFreeAndroid
EtarFreeFreeAndroid
Proton CalendarFree plan · from $3.99/moYesWeb, macOS, Windows, Linux, iOS, Android
Tuta CalendarFree plan · from €3/moYesWeb, macOS, Windows, Linux, iOS, Android
Google CalendarFree plan · from $7/moYesWeb, iOS, Android
aCalendarFree plan · from $2.49 one-timeYesAndroid

How each one differs from Fossify Calendar

  1. Etar

    Open-source Material Design calendar for Android

    • Etar is free. Fossify Calendar is free.

    Suits: Android users who want a plain calendar with open source code

    Etar vs Fossify CalendarEtar 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. Fossify Calendar is free.
    • Only Proton Calendar lists a web app.
    • Only Proton Calendar lists macOS, Windows, Linux and iOS apps.
    • Proton Calendar is end-to-end encrypted, according to its own site.
    • Proton Calendar also covers booking links.

    Suits: People who want event details kept unreadable to the provider

    Proton Calendar vs Fossify CalendarProton Calendar 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). Fossify Calendar is free.
    • Only Tuta Calendar lists a web app.
    • Only Tuta Calendar lists macOS, Windows, Linux and iOS apps.
    • Tuta Calendar is end-to-end encrypted, according to its own site.

    Suits: People who want a calendar their provider cannot read

    Tuta Calendar vs Fossify CalendarTuta Calendar pricing and details

  4. Google Calendar

    Online calendar from Google, free with a personal account

    • Google Calendar starts at $7 per user / month with a 1-year commitment (Workspace Business Starter). Fossify Calendar is free.
    • Only Google Calendar lists a web app.
    • Only Google Calendar lists an iOS app.
    • Fossify Calendar is open source, according to its own site.
    • Google Calendar also covers tasks and booking links.

    Suits: Anyone who already has a Google Account and wants a free calendar

    Google Calendar vs Fossify CalendarGoogle Calendar pricing and details

  5. aCalendar

    Android calendar with widgets, tasks and one-time upgrades

    • aCalendar starts at $2.49 to $11.99 per one-time in-app upgrade; aCalendar+ is $11.99. Fossify Calendar is free.
    • aCalendar can be bought with a one-time purchase.
    • Fossify Calendar is open source, according to its own site.
    • aCalendar also covers tasks.

    Suits: Android users who want a full calendar without a subscription

    aCalendar vs Fossify CalendaraCalendar pricing and details

Limits worth knowing in Fossify Calendar

  • Android only; the Fossify project lists Android as its sole platform.
  • The app has no sync service or cloud account of its own. Syncing depends on accounts or calendar providers configured on the device.
  • Development is funded by donations, and help comes through a public issue tracker and community channels.
  • Google Play and F-Droid publish releases on their own schedules, so versions can differ between stores.
Fossify Calendar pricing and details

Common questions

What are the alternatives to Fossify Calendar?

The alternatives to Fossify Calendar in this directory are Etar, Proton Calendar, Tuta Calendar, Google Calendar and aCalendar. Each one has a side-by-side comparison with Fossify Calendar.

Is there a free alternative to Fossify Calendar?

Yes. Etar is free to use. Proton Calendar, Tuta Calendar, Google Calendar and aCalendar have a free plan alongside paid ones.

Which Fossify Calendar alternatives work on Windows?

The Fossify Calendar listing does not include a Windows app. Proton Calendar and Tuta Calendar list one.

Which Fossify Calendar alternatives work on macOS?

The Fossify Calendar listing does not include a macOS app. Proton Calendar and Tuta Calendar list one.

When were these prices checked?

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

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