workspace.google.com
In short: Getting listed on Google Workspace Marketplace is free. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Build your add-on for Drive, Docs, Sheets, Gmail, or another Workspace product and publish it.
Build your add-on for Drive, Docs, Sheets, Gmail, or another Workspace product and publish it.
Must genuinely integrate with Google Workspace and pass OAuth, configuration, and app review.
Open the submission page on workspace.google.com and complete its form — that is the "Open submit page" link at the top of this page.
Must genuinely integrate with Google Workspace and pass OAuth, configuration, and app review.
Priority sets the band — this one is do first. Cost (free) and effort (moderate) move it within that band, which puts it in the highest impact tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.