Mailwing is a desktop application that brings several webmail accounts into one window using each provider’s own interface. Each account has an isolated browser session, an unread badge, and desktop notifications that open the relevant inbox. It supports Gmail, Outlook, Zoho Mail, Fastmail, Yahoo Mail, and ProtonMail, together with associated provider applications. Additional features include ad and tracker filtering, a mailto handler, keyboard shortcuts, and local notes and to-dos.