Inbox Zero: Open-source Superhuman alternative

Inbox Zero's AI tier costs $20 per month and sorts each incoming message, then prepares replies in the user's writing style before a thread is opened. The email app is free to use. It runs in a browser, in the desktop apps for Mac and Windows, or in the native iPhone app. Teams can leave private comments and receive Slack alerts. The project is licensed under AGPL-3.0 and has over 12,000 GitHub stars and