Etar vs Tuta Calendar

Etar

• Android users who want a plain calendar with open source code
• People who sync a self-hosted CalDAV server through DAVx5
• Keeping an offline calendar that stays on the phone

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

Etar

• Android only; the F-Droid build of version 1.0.57 requires Android 6.0 or newer.
• No CalDAV client is included. Syncing a calendar with a server needs another app, such as DAVx5.
• The project describes its ICS import as unstable and advises caution if your provider sends invitation emails automatically.
• The Google Play link in the project's README returned a Not Found page on the check date; F-Droid carries the current version.

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.

Etar

Month, week, day and agenda views

Four views in a Material Design interface with dark and light themes. Recent versions let the week start on any day and can stagger overlapping events.

Works with any Android calendar provider

Etar reads Android's calendar storage, so it shows every calendar synced to the phone. You choose which ones are displayed and which one new events go to.

Offline calendars

A calendar can be created that is stored on the phone only and never synced to a server.

ICS sharing, import and export

Calendars can be shared as ICS files and imported or exported from storage, including invitations received by email. The project warns that import has known bugs.

Agenda widget

A home screen widget lists upcoming events in agenda form. The interface is translated into many languages by volunteers.

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.

Etar

• Etar$0

  The complete app, built and signed by F-Droid from the public source code. Version 1.0.57 requires Android 6.0 or newer.

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.

Etar

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.