Apple calendar runs both the macOS and iOS mobile operating systems. Offering online cloud backup of calendars using Apple’s iCloud service, it can sync with Google Calendar and Microsoft Exchange Server. Users can schedule events in their day that include time, location, duration, and extra notes.

Caldav is a protocol that allows different clients/servers to access scheduling information on remote servers as well as schedule meetings with other users on the same server or other servers. It extends WebDAV specification and uses iCalendar format for the data.

Microsoft Office 365 is a suite of apps that helps you stay connected with others and get things done. It includes but is not limited to Microsoft Word, PowerPoint, Excel, Teams, OneNote and OneDrive. Office 365 allows you to work remotely with others on a team and collaborate in an online environment. Both web versions and desktop/mobile applications are available.

Sync your Schedly calendar with Amie for a unified scheduling view.

Sync your Schedly calendar with Cron for unified scheduling.

For calendars hosted on on-premises Microsoft Exchange 2013 servers

For calendars hosted on on-premises Microsoft Exchange 2016 servers

Sync your Microsoft Exchange calendar to check availability.

Feishu Calendar is a time management and scheduling service developed by Feishu. Allows users to create and edit events, with options available for type and time. Available to anyone that has a Feishu account on both mobile and web versions.

Import events from any ICS calendar feed to check availability.

Lark Calendar is a time management and scheduling service developed by Lark. Allows users to create and edit events, with options available for type and time. Available to anyone that has a Lark account on both mobile and web versions.

Sync your Schedly calendar with Vimcal for fast, unified scheduling.

Sync your Zoho Calendar to check availability and prevent double bookings.

Google Calendar is a time management and scheduling service developed by Google. Allows users to create and edit events, with options available for type and time. Available to anyone that has a Gmail account on both mobile and web versions.