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Calendar provides tools for users to create, manage, and share event and calendar details. Managing complex calendars can be time-consuming when viewing, creating, updating, and sharing individual events, especially when importing or exporting event information from other applications.

Save time and effort for your users by extending Calendar with add-ons. When you build a Google Workspace add-on, you can define interfaces inserted directly into Calendar, exactly where the user needs them. These interfaces automate calendar tasks, present additional information, or let the user interact with a third-party system without switching browser tabs.

Add-ons can define the following kinds of extensions within Calendar:

Calendar add-ons aren't supported on mobile clients.

See what you can make

add-ons are built using Google Apps Script, and their interfaces defined using the Apps Script Card service. See Building add-ons for an overview. Add-on behavior is configured using a manifest, which includes Calendar-specific sections.

When configuring your Google Workspace add-on to extend Calendar, you must decide what interfaces to create and what actions it can take. The following guides provide more information:

If you maintain a conferencing system, see Third-party conferencing overview for details on how to integrate your conference types within Calendar.

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Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2026-07-22 UTC.

Need to tell us more? [[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2026-07-22 UTC."],[],["Google Workspace add-ons extend Google Calendar by inserting custom interfaces directly into the platform. These add-ons automate tasks, display extra information, and allow users to interact with third-party systems without switching tabs. Add-ons offer non-contextual homepages and contextual interfaces for viewing/editing events. Users can also utilize custom conferencing solutions. Add-ons are built using Apps Script and Card service, and are configured via a manifest. Developers can create specific interfaces and define actions, and can integrate third-party conferencing systems.\n"]]
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