Gmailytics

Gmailytics shows you who fills your Gmail inbox. It groups your inbox by sender, so you can see which newsletters, stores and notification senders send you the most mail. You can then trash or archive everything from a sender at once, or unsubscribe from newsletters. Every batch action asks you to confirm first, and trashed mail stays in Gmail's Trash for 30 days, so you can recover it if you change your mind. Cleanup happens in the web app. A companion extension for Chrome, Edge and Firefox keeps your inbox synced in the background and shows your unread count. There's a free plan, and Pro is a low-cost subscription.