The Merkuro Calendar Insider’s Guide
Everything we know about Merkuro Calendar in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Merkuro Calendar
The Insider’s Guide
Open-source calendar and task app from KDE for Linux
Every plan, grade, refund rule and rival among calendar and scheduling apps, read from Merkuro Calendar’s own pages.
Made by KDE · checked Oct 9, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Merkuro Calendar’s own pages, its app-store listings and our grades. Every fact in it is on Merkuro Calendar’s page too, where it is kept up to date. Checked Oct 9, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.6
GPA, above 30 of the 74 other calendar and scheduling apps we grade
Merkuro Calendar is the calendar part of Merkuro, KDE's suite of email, calendar, contact and task apps, which was formerly known as Kalendar. It has month, week and schedule views and a task view with subtasks, and it works with local calendars as well as online ones such as Nextcloud, Google Calendar and Exchange through KDE's Akonadi framework. It is free software under GPL-3.0-or-later, built to be usable on both desktop and mobile screens.
To get you started, here are 8 things to know about Merkuro Calendar, taken from its own pages and our grades.
It depends on Akonadi and the KDE PIM packages, and the project says the calendar is heavily restricted without kdepim-runtime installed.
- 1
Best for a free calendar built for the KDE Plasma desktop
Stable releases are Linux only, and Proton Calendar and Todoist can't be connected.
- 2
It is free
Merkuro Calendar has no paid plan at all. Free and open source under GPL-3.0-or-later, installed from a Linux distribution's packages or as part of the Kontact Flatpak. KDE lists no paid version and asks for donations.
- 3
It runs on Linux
Linux.
- 4
Month, week and schedule views
The month view gives an overview of the whole month, the week view shows each day hour by hour, and the schedule view lists upcoming events in order.
- 5
Tasks and subtasks
A separate task view shows tasks and their subtasks as a tree, with filters that can be customized.
- 6
Local and online calendars
Supports CalDAV calendars such as Nextcloud, Google and Exchange calendars, iCal files and folders, and Kolab and Open-Xchange groupware servers.
- 7
A 2.6 GPA, above 30 of 74
That is against the other calendar and scheduling apps we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
Merkuro Calendar is free, so making your own would save you nothing.
Merkuro Calendar at a glance
- Pricing
- Free
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Linux
- Made by
- KDE
- Category
- Calendar & Scheduling
- Our grade
- 2.6 GPA, good
The report card
Best for a free calendar built for the KDE Plasma desktop
Merkuro Calendar is KDE's free, open-source calendar for Linux, with tasks and subtasks beside events and sync with Nextcloud, Google and Exchange. It leans on KDE's Akonadi packages, the project says it's heavily restricted without kdepim-runtime, and the Flatpak misses parts of the desktop integration. Stable releases are Linux only, and Proton Calendar and Todoist can't be connected.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | A | Free software under GPL-3.0-or-later, against a $6 a month middle in this category. KDE lists no paid version and simply asks for donations. |
| Free plan and trial | A | Free outright, and you get the complete app from your distribution's packages or the Kontact Flatpak. Nothing is held back for a paid tier, because there isn't one to hold it. |
| Features | C | The basics: month, week and schedule views, a task view with subtasks as a tree, and CalDAV, Google, Exchange, Kolab and iCal support. The gaps are in KDE's own notes, though. Proton Calendar can't be connected, nor can non-standard task services like Todoist, and there's no plain-language entry or sharing. |
| Ease of use | C | There's some plumbing. It depends on Akonadi and the KDE PIM packages, and the project says the calendar is heavily restricted without kdepim-runtime installed. The Flatpak also lacks bits of desktop integration, so KDE points you to a distribution package. |
| Platforms and integrations | D | One operating system: stable releases are Linux only, and the Windows builds are nightly installers KDE labels unstable and for testing. There is a mobile layout for Plasma phones, and it connects to CalDAV, Google, Exchange, Kolab and Open-Xchange. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Merkuro Calendar is for
- Fits if you run KDE Plasma and want your events in the desktop's own clock widget
- Works for Linux users whose calendars live on Nextcloud, Google or Exchange
Who it is not for
- Skip it if you're on a Mac, or want a stable Windows app, because stable releases are Linux only
- Not for you if your calendar is Proton Calendar, or your tasks live in Todoist, as neither can be connected
- Watch out: without kdepim-runtime and Akonadi installed, the project says the calendar is heavily restricted
- Watch out: the Kontact Flatpak lacks the calendar applet plugin, so KDE points you to a distribution package
- Too light for anyone wanting sharing or typed natural-language entry, which aren't listed
Good to know
Good for
- KDE Plasma users who want a calendar made for their desktop
- Linux users syncing Nextcloud, Google or Exchange calendars
- People who keep tasks and subtasks next to their events
Worth knowing
- Stable releases are for Linux. The Windows builds on KDE's site are nightly installers that KDE labels unstable and intended for testing.
- It depends on Akonadi and KDE PIM packages; without kdepim-runtime, the project says the calendar component is heavily restricted.
- The Kontact Flatpak that includes Merkuro lacks some desktop integration, such as the calendar applet plugin, so KDE recommends a distribution package.
- Proton Calendar cannot be connected, and services with non-standard calendars or task lists, such as Todoist, are not supported.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Free
No paid plan at all
Merkuro Calendar is free to use.
KDE lists no paid version and simply asks for donations.
Merkuro Calendar
$0
The complete app, installed through Discover, a distribution's package manager or the Kontact Flatpak. Release 26.08.2 is dated 2026-10-08.
The free plan
Free and open source under GPL-3.0-or-later, installed from a Linux distribution's packages or as part of the Kontact Flatpak. KDE lists no paid version and asks for donations.
Read from apps.kde.org on Oct 9, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Linux
Open-source calendar and task app from KDE for Linux. Here is what it does, as its own site describes it, and what it covers: open source, tasks, calendar.
The basics: month, week and schedule views, a task view with subtasks as a tree, and CalDAV, Google, Exchange, Kolab and iCal support.
- Month, week and schedule views
- The month view gives an overview of the whole month, the week view shows each day hour by hour, and the schedule view lists upcoming events in order.
- Tasks and subtasks
- A separate task view shows tasks and their subtasks as a tree, with filters that can be customized.
- Local and online calendars
- Supports CalDAV calendars such as Nextcloud, Google and Exchange calendars, iCal files and folders, and Kolab and Open-Xchange groupware servers.
- Sync through Akonadi
- KDE's Akonadi framework fetches, edits, creates and deletes events on remote services. The project recommends installing the kdepim-runtime package before starting the app.
- Plasma clock widget integration
- Events can appear in the calendar of Plasma's digital clock widget by enabling the PIM Events Plugin in the widget's settings and choosing which calendars to show.
- Desktop and mobile layouts
- The interface is designed for desktop, mobile and sizes in between, and the listing includes a mobile view. The project describes it as syncing across a Plasma desktop or phone.
Where it runs
- Linux
What it works with
- Nextcloud
- Google Calendar
- Microsoft Exchange
- Outlook
- Kolab
- Open-Xchange
- CalDAV
Merkuro Calendar is made by KDE.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
30/74
Other calendar and scheduling apps it is graded above
Merkuro Calendar's GPA of 2.6 is higher than 30 of the 74 other calendar and scheduling apps we grade, and level with 13.
It stands best on free plan and trial (A, above 56 of 74) and worst on platforms and integrations (D, above 0).
Merkuro Calendar has no paid plan.
On features, ease of use and platforms it scores 1.7 out of 4. Nothing scores higher for less, though at least one tool matches that score at a lower price.
Each grade against the category
Every bar is all 75 calendar and scheduling apps we grade, cut by the letter each got. Merkuro Calendar’s own letter is outlined.
- AValue for moneyAbove 45 of 74
- AFree plan and trialAbove 56 of 74
- CFeaturesAbove 3 of 74
- CEase of useAbove 0 of 74
- DPlatforms and integrationsAbove 0 of 74
Price against what you get
Each dot is one of 67 calendar and scheduling apps. Further left costs less; higher up scores better on features, ease of use and platforms. Merkuro Calendar is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
Merkuro Calendar is free, so making your own would save you nothing.
And it is not the kind of software a weekend replaces.
What you could make
- Calendar and tasks: an app builder makes these well.
What you could not
- A real app for Linux. Something home-made would be a web page.
- It plugs into other products, Nextcloud, Google Calendar and Microsoft Exchange among them.
- Hooks into the device itself: widgets.
What this rests on. Merkuro Calendar’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
GNOME Calendar, Rainlendar, CalenGoo, Tuta Calendar and Google Calendar
The 5 tools Merkuro Calendar is most often weighed against, with where each one differs from it.
- 2.8GPA
GNOME Calendar
Free
Free, open-source calendar app for the GNOME desktop on Linux.
- Merkuro Calendar also covers tasks.
- 2.6GPA
Rainlendar
Free plan · from €9.95 one-time
Skinnable desktop calendar for Windows, Mac and Linux.
- Only Rainlendar lists Windows and macOS apps.
- Merkuro Calendar is open source, according to its own site.
- Rainlendar can be bought with a one-time purchase.
- 2.8GPA
CalenGoo
Free trial · from $5.99 one-time
Highly configurable calendar and task app sold as a one-time purchase.
- Merkuro Calendar has a free plan. CalenGoo does not, though it has a free trial.
- Only CalenGoo lists iOS, Android, Windows and macOS apps.
- Merkuro Calendar is open source, according to its own site.
- 2.4GPA
Tuta Calendar
Free plan · from €3/mo
End-to-end encrypted calendar bundled with Tuta Mail.
- Only Tuta Calendar lists a web app.
- Only Tuta Calendar lists macOS, Windows, iOS and Android apps.
- Tuta Calendar is end-to-end encrypted, according to its own site.
- 3.4GPA
Google Calendar
Free plan · from $7/mo
Online calendar from Google, free with a personal account.
- Only Merkuro Calendar lists a Linux app.
- Only Google Calendar lists a web app.
- Only Google Calendar lists iOS and Android apps.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
12
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Merkuro Calendar free?
Yes. Merkuro Calendar is free to use.
How much does Merkuro Calendar cost?
Merkuro Calendar lists one plan. Merkuro Calendar: $0.
What platforms does Merkuro Calendar work on?
Merkuro Calendar is available on Linux.
Does Merkuro Calendar have an Android app?
No Android app was listed when its pages were read on Oct 9, 2026. Merkuro Calendar is listed for Linux.
Does Merkuro Calendar have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Merkuro Calendar is listed for Linux.
Is Merkuro Calendar open source?
Yes. Merkuro Calendar is open source, according to its own site.
What does Merkuro Calendar integrate with?
Merkuro Calendar's listing names Nextcloud, Google Calendar, Microsoft Exchange, Outlook, Kolab, Open-Xchange and CalDAV.
Who makes Merkuro Calendar?
Merkuro Calendar is made by KDE.
What are the alternatives to Merkuro Calendar?
The closest alternatives to Merkuro Calendar in our directory are GNOME Calendar, Rainlendar, CalenGoo, Tuta Calendar and Google Calendar.
How does Merkuro Calendar compare with other calendar and scheduling apps?
Merkuro Calendar's GPA of 2.6 is higher than 30 of the 74 other calendar and scheduling apps we grade, and level with 13.
Is Merkuro Calendar good value for money?
ToolGPA grades Merkuro Calendar A for value for money. Merkuro Calendar has no paid plan.
Could I make my own version of Merkuro Calendar?
Merkuro Calendar is free, so making your own would save you nothing. And it is not the kind of software a weekend replaces.
Where this guide comes from
The prices, plans, platforms and features were read from Merkuro Calendar’s own pages on Oct 9, 2026, and the grades were given on Oct 10, 2026. Graded from this listing, whose facts were read from KDE's own pages on 9 October 2026. Also tested with a demo account on 2026-09-17.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by KDE. Prices change, so check apps.kde.org before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Merkuro Calendar, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/merkuro-calendar
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Merkuro Calendar: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/merkuro-calendar
Know someone choosing between calendar and scheduling apps?
Send them this guide: toolgpa.com/tools/merkuro-calendar/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded calendar and scheduling apps after Merkuro Calendar, each with an Insider's Guide of its own.
- Calendar & Scheduling Insider's GuideEvery one of the 75 calendar and scheduling apps we grade, compared
- Notion Calendar Insider's GuideFree calendar app that connects to Notion databases3.6 GPA
- Google Calendar Insider's GuideOnline calendar from Google, free with a personal account3.4 GPA
- World Time Buddy Insider's GuideVisual time zone converter and world clock for planning calls3.4 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Merkuro Calendar’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Merkuro Calendar is a trademark of its owner, and this guide is not made, paid for or approved by KDE. Prices and plans change: check apps.kde.org before you buy.