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KOrganizer alternatives: 4 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave KOrganizer: dense, old-fashioned interface, and akonadi backend can be heavy to run and configure. We ranked 4 alternatives by how directly each one replaces KOrganizer, then by reviews, real visits and how recently each app's facts were checked against its own website. GNOME Calendar currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Proton Calendar logoProton CalendarFree plan + paidYesWeb, iOS, Android +34 of 459.6
2Fossify Calendar logoFossify CalendarOpen sourceYesAndroid4 of 457.2
  1. Proton Calendar logo

    1. Proton CalendarTop pick

    Best for: Privacy-minded people and teams who want encrypted calendars, ideally with Proton Mail

    Free plan + paidOpen sourceWeb, iOS, Android, macOS, Windows, Linux

    59.6

    score / 100

    Why switch from KOrganizer

    Encrypted calendar with a Linux desktop app.

    Pros

    • End-to-end encrypted event details
    • Swiss jurisdiction and open-source apps
    • Free plan, bundled with Proton Mail on paid plans

    Cons

    • No direct CalDAV sync with third-party clients
    • Fewer integrations than Google Calendar
    • Best value only if you use other Proton apps
    Visit Proton Calendar Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Proton Calendar a good KOrganizer alternative?

    Verified facts

    4 of 4 verified
    End-to-end encryption
    Yes
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    Jurisdiction
    Switzerland
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    Desktop apps
    macOS, Windows, Linux
    Checked Oct 25, 2026proton.me(opens source in a new tab)
    Free plan
    Yes
    Checked Oct 25, 2026proton.me(opens source in a new tab)
  2. Fossify Calendar logo

    2. Fossify Calendar

    Best for: Android users who want an open-source, ad-free calendar that never touches the internet

    Open sourceAndroid

    57.2

    score / 100

    Why switch from KOrganizer

    Open-source calendar for your Android phone.

    Pros

    • No internet permission, so data stays on the device
    • Open source and ad-free
    • Works with any sync account configured on the phone

    Cons

    • Android only
    • No built-in sync service
    • Plain interface
    Visit Fossify Calendar Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Fossify Calendar a good KOrganizer alternative?

    Verified facts

    4 of 4 verified
    Internet access
    None requested
    Checked Oct 25, 2026fossify.org(opens source in a new tab)
    Sync service
    None; uses device calendar accounts
    Checked Oct 25, 2026fossify.org(opens source in a new tab)
    Views
    Day, week, month, year, list
    Checked Oct 25, 2026fossify.org(opens source in a new tab)
    Open source
    Yes
    Checked Oct 25, 2026fossify.org(opens source in a new tab)

The best KOrganizer alternative for…

The highest-ranked app in this list for each need.

GNOME Calendar logo

Best KOrganizer alternative for most people

GNOME Calendar

A simpler, lighter calendar for GNOME desktops.

Fossify Calendar logo

Best KOrganizer alternative for a free option

Fossify Calendar

Open-source calendar for your Android phone.

Proton Calendar logo

Best KOrganizer alternative for a free plan you can upgrade

Proton Calendar

Encrypted calendar with a Linux desktop app.

GNOME Calendar logo

Best KOrganizer alternative for open source

GNOME Calendar

A simpler, lighter calendar for GNOME desktops.

Morgen logo

Best KOrganizer alternative for Mac

Morgen

Modern cross-platform calendar with a polished Linux app.

Morgen logo

Best KOrganizer alternative for Windows

Morgen

Modern cross-platform calendar with a polished Linux app.

GNOME Calendar logo

Best KOrganizer alternative for Linux

GNOME Calendar

A simpler, lighter calendar for GNOME desktops.

Morgen logo

Best KOrganizer alternative for iPhone and Android

Morgen

Modern cross-platform calendar with a polished Linux app.

Morgen logo

Best KOrganizer alternative for working in the browser

Morgen

Modern cross-platform calendar with a polished Linux app.

KOrganizer alternatives: common questions

What is the best alternative to KOrganizer?

GNOME Calendar ranks first right now. A simpler, lighter calendar for GNOME desktops. Morgen and Proton Calendar follow it in our ranking.

Is there a free alternative to KOrganizer?

Yes. GNOME Calendar (open source), Proton Calendar (free plan + paid) and Fossify Calendar (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to KOrganizer?

Yes: GNOME Calendar, Proton Calendar and Fossify Calendar.

Which KOrganizer alternatives work on Linux?

GNOME Calendar, Morgen and Proton Calendar run on Linux.

Why do people switch from KOrganizer?

The complaints we hear most: dense, old-fashioned interface; akonadi backend can be heavy to run and configure; pulls in many KDE dependencies on other desktops.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces KOrganizer, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.