5 Best Calendar Apps for Windows 10 & 11 in 2026

Windows includes a basic calendar, but if you juggle work and personal schedules across Google, Outlook, and iCloud, a better calendar app makes a real difference. Here are the best calendar apps for Windows 10 and 11 in 2026.

Best Calendar Apps for Windows in 2026

1. Microsoft Outlook

The new Outlook for Windows combines email and calendar in one app, syncs with Microsoft 365 and Google accounts, and offers smart scheduling. It's the most capable built-in option for Windows users.

2. Google Calendar

The most popular calendar service, accessible in any browser or as a web app. It offers excellent sharing, reminders, and integration with Gmail and Google Meet - ideal if you live in Google's ecosystem.

3. Morgen

A powerful desktop calendar for Windows that unifies Google, Outlook, and iCloud calendars in one view, with task management and time-blocking features.

4. Notion Calendar

A clean, free calendar (formerly Cron) that connects multiple Google accounts and integrates with Notion, great for knowledge workers.

5. Mozilla Thunderbird

A free, open-source email and calendar app with the built-in Lightning calendar, supporting CalDAV, Google, and other accounts - a privacy-friendly desktop option.

Which Calendar App Should You Use?

For most Windows users, the built-in Outlook or Google Calendar covers the basics well. If you need to merge multiple calendars and block time, Morgen and Notion Calendar are excellent. For privacy, Thunderbird is the best free desktop choice. For more productivity tools, see our guide to the best to-do list apps.