Tart is a comprehensive validation tool designed for web developers, focusing on a range of common web resources such as HTML, CSS, RSS, Atom, and sitemaps. This application streamlines the validation process by allowing users to categorize and filter diagnostics, enabling a more organized approach to problem-solving. By creating custom categories, developers can easily manage and locate issues, enhancing their workflow efficiency.

One of the standout features of Tart is its integrated editor, which allows users to directly access and modify the source of any detected problems within the same window. This eliminates the need for switching between different applications, making it a convenient solution for developers looking to quickly validate and fix web resources. Its user-friendly interface and powerful capabilities position Tart as a valuable addition to any web development toolkit.