Boomerang for Gmail is an AI-based tool that helps you write better emails in real-time based on data from millions of messages. It provides insights into writing styles and recommends adjustments for maximum impact, helping you strike the right tone and balance. It also offers real-time feedback and predictions on the likelihood of receiving a response. In addition, Boomerang offers features for scheduling, reminding, and tracking emails, as well as email tips, etiquette, and shortcuts.