Microsoft Outlook is a popular email and calendar software that offers advanced features for managing emails, calendars, tasks, and contacts.
Starting at $69.99/year
Best Etar Alternatives ranked by AI · updated Aug 2026
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Etar is an open-source Android calendar application based on the AOSP Calendar project. It supports local calendars, recurring events, reminders, agenda and month views, and synchronization through Android calendar providers.
Top 6 Etar alternatives
Thunderbird is a free and open-source email client that offers easy setup and customization options.
GNOME Calendar is a simple and intuitive calendar application for GNOME desktop environment.
Google Calendar is a time-management and scheduling calendar service developed by Google. It allows users to create and edit events, set reminders,...
Apple Calendar is a calendar application for iPhone, iPad, Mac, and iCloud users. It supports recurring birthday events, alerts, contact integration, invitations,...
Pros
- Built into Apple devices and tightly integrated with Contacts
- Provides dependable recurring alerts without another dedicated app
- Offers stronger event and invitation support than Billy Birthday
Cons
- Best experience is limited to users in the Apple ecosystem
- Less specialized for birthday lists and gift-related notes
- Sharing and collaboration are less flexible than Google Calendar in mixed-device groups
6
Kalendar
KDE
Kalendar is an open-source desktop calendar application for Linux, designed primarily for KDE Plasma users. It supports local and remote calendars, including...
Pros
- Native KDE and Qt integration with Plasma notifications and account settings
- Supports local calendars and standard CalDAV synchronization
- Free and open source with no advertising or subscription
Cons
- Smaller feature set and ecosystem than Google Calendar or Outlook
- Primarily targets Linux and KDE users rather than cross-platform audiences
- Less mature collaboration and scheduling support than major cloud calendars
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