How to create a Gmail addon? [closed]

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How can I create a Gmail addon? I don't find any API to do it.

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Gmail finally supports ADD-ONS now in Oct, 2017.

You can read the documentation here - https://developers.google.com/gmail/add-ons/

This Add-Ons will work on Gmail web-app and Android App. iOS support should come soon.

But still you can't publish your Add-Ons yet as mentioned here - https://developers.google.com/gmail/add-ons/how-tos/publish

Support to publish should come soon, however you can still develop and test for that early mover advantage.

However you can use few which are already published - https://gsuite.google.com/marketplace/category/works-with-gmail

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You can however add scripted gadgets to the sidebar, or triggered by email content:

http://code.google.com/apis/gmail/

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Google has recently introduced add-ons for Gmail (probably on Oct, 24 2017). It can be developed with Google Apps Script. Google's documentation says

What Gmail add-ons can do ?

Displaying additional information for the user in the Gmail UI. Connecting to non-Google services, to retrieve information or take other actions. Providing an interactive interface to allow the user to control the add-on or send information to another service.

As of now, Google is not allowing to publish new add-ons however they will allow it in future.

While a few add-ons have been made available in the G Suite Marketplace for users to install, it is not currently possible to publish your own add-on to the Marketplace.

How can you publish your own add-on ?

As of now (26th Oct, 2017), they consider it on request basis. If you have a cool idea, fill this form to let them know about it. You will get notified once they accept your listing.

Here is how the add-on interface looks like inside Gmail