Merkuro Calendar vs Tuta Calendar

Merkuro Calendar

• 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

Tuta Calendar

• People who want a calendar their provider cannot read
• Tuta Mail users who want email, contacts and calendar in one account
• Linux users looking for an open-source desktop calendar client

Merkuro Calendar

• 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.

Tuta Calendar

• The Free plan includes one calendar and has no calendar sharing, event invitations or offline support.
• Calendar has no subscription of its own: paid features come with Tuta's paid personal or business mail plans.
• Prices are listed in euros: personal plans include taxes, business plans exclude them, and totals can vary with payment platform fees and exchange rates.
• Other calendars are brought in by import; the calendar page mentions no two-way sync with Google or Outlook calendars.

Merkuro Calendar

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.

Tuta Calendar

End-to-end encryption

Events, invitations and shared calendars are encrypted end to end with what Tuta calls quantum-safe encryption, so the provider cannot read them.

Encrypted reminders

Event reminders arrive as push notifications on phones and computers. They are sent encrypted and kept hidden from the phone's operating system.

Calendar sharing

On paid plans a calendar can be shared with family or colleagues with read only, read and write, or write and manage sharing rights.

Event invitations

Paid plans can send and receive calendar invitations, and can send one encrypted to someone outside Tuta using a shared password.

Apps on every platform

Apps for Android and iPhone, open-source desktop clients for Windows, macOS and Linux, and a browser version. The Android app is also offered through F-Droid.

Built into Tuta Mail

The calendar shares an account with Tuta's encrypted email and contacts, and existing calendars can be imported in the settings.

Merkuro Calendar

• 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.

Tuta Calendar

• Free€0

  One encrypted calendar, 1 GB of storage and apps on every platform. No calendar sharing or event invitations.

• Revolutionary€3

  per month, paid yearly (€3.60 paid monthly), incl. taxes

  Tuta's personal mail and calendar plan: unlimited calendars, calendar sharing, event invitations, offline support and 20 GB of storage.

• Legend€8

  per month, paid yearly (€9.60 paid monthly), incl. taxes

  The same calendar features with 500 GB of storage, 30 extra email addresses, 10 custom domains and priority email support.

• Essential€6

  per user / month, paid yearly (€7.20 paid monthly), excl. taxes

  Business plan with unlimited calendars, sharing and event invitations, shared mailboxes and 50 GB of storage per user.

• Advanced€8

  per user / month, paid yearly (€9.60 paid monthly), excl. taxes

  Business plan with the same calendar features, 500 GB of storage per user, 10 custom domains and priority email support.

• Unlimited€12

  per user / month, paid yearly (€14.40 paid monthly), excl. taxes

  Business plan with 1,000 GB of storage per user, unlimited custom domains and custom branding.

Merkuro Calendar

No public discounts listed.

Tuta Calendar

• Annual discount

  Pay yearly and save two months

  Tuta's pricing page shows a yearly payment saving €7.20 on the lowest paid plan (€36 instead of €43.20) and €19.20 on Legend (€96 instead of €115.20).

• Nonprofit

  50% off for nonprofits and schools

  Registered nonprofits and schools for general education can apply to Tuta's sales team for a 50% discount on a subscription.

• Other savings

  Free for qualifying open source projects

  Open source teams can apply by email for a free version of Tuta. Tuta's blog sets out which projects qualify.