There are a few things you can't do with Gmail add-ons.

Gmail add-ons on iOS

Gmail add-ons have not yet been added to the iOS version of the Gmail app.

Change features in Gmail

The add-ons framework is designed to enhance Gmail—not to add limits. Consequently, you can't alter existing features or the Gmail user interface.

Use client-side scripting

You can't design a custom UI for your add-on using HTML, CSS and Javascript. Gmail add-ons use a widget-based approach to building user interfaces. This allows the add-on to work well on desktop and mobile platforms without requiring you to build an interface for each.

Use Apps Script triggers

You can't create or use Apps Script simple or installable triggers in a Gmail add-on.

Charge users to install

We don't provide a way to charge users for installing add-ons, and add-ons can't include ads. However, you can roll your own payment system or call into an existing billing database. Your add-on can connect to non-Google services that bill users.

SVG Image support

You can't currently use SVG images with Card service widgets.

Have more than 100 widgets

For performance reasons, you can't add more than 100 widgets to a card section.

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Gmail Add-ons
Gmail Add-ons
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