When Gearset first connects to a Salesforce org, it requests a range of permissions:

The primary permission that underlies this is the Modify all data permission. To use Gearset to deploy both metadata and data between your orgs, the user (actually, your user's profile) you use to authenticate against the org must have this permission.

Why does Gearset need this permission?

As a deployment tool, Gearset needs the ability to read and write org metadata and also data (if using the data loader). 

What if I'm not using data deployment?

There is an Administrative Permission named Modify Metadata Through Metadata API Functions. You may consider configuring the Profile to not have Modify All Data permission, and only have Modify Metadata Through Metadata API Functions permission.

Regardless, unless you're using Gearset's data loader, the app will never read or write any org data.

Can I control this access?

Gearset's access to an org can be revoked from within the org at any point by the end user, via the Connected Apps OAuth Usage page.

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