This article explains how to find out who or what has access to your Gmail data, and how to use Gmail's built-in security tools to revoke that permission. The article also includes information on how to see which apps and services have recently accessed your data.

You may have given multiple websites and services access to some of your Gmail information in the past. Even if you no longer use a service, it can still access your Gmail account.

This Gmail management feature is in the web browser, not the app. To find out which websites and apps have accessed your Gmail account data in the past and revoke that access:

Go to the Permissions page in your Google Account control panel.