MailMood is a Chrome add-on designed to help users understand the emotional tone of their emails at a glance. By analyzing emails in the Gmail interface, it assigns color-coded mood badges next to each subject line, allowing users to quickly gauge how a message might come across. The badges indicate various tones, such as calm, warm, urgent, and neutral, enabling users to adjust their communication style accordingly. This functionality promotes effective email interactions and minimizes potential misunderstandings.

In addition to tone analysis, MailMood promises a forthcoming rewrite feature that will allow users to modify their drafted emails to match their desired tone, whether it be corporate, casual, or assertive. Privacy is a key aspect, as all processing is conducted locally without storing or sharing email content. MailMood is free to use, with a pro version expected to introduce enhanced real-time feedback and rewriting capabilities.