Vexlio is an app that allows you to create interactive technical diagrams with click-to-reveal popups. It's used by engineers, software developers, educators, technical writers, and more to explain systems, processes, and concepts. A core capability of Vexlio is support for interactive diagrams with popups. Any object in a drawing can host attached popup content that appears on hover or click, making it possible to layer additional explanations, alternative views, or example scenarios without crowding the main diagram. These interactive diagrams can be shared through a link or embedded in other content while preserving the popup behavior. Key feature areas include: • Interactive popup attachments that let authors nest detailed diagrams, notes, images, or callouts inside objects, enabling multi-level explanations in a single document. • Native live-edit LaTeX equations, suitable for engineering, physics, and mathematics diagrams. • Comprehensive drawing tools for technical diagrams, including snapping, alignment aids, connectors, syntax-highlighted code snippets, and more. Typical usecases include diagrams such as architecture maps, flowcharts, system sketches, math illustrations, and instructional graphics. Users can export or share their creations as static images in PNG, SVG, PDF, or as live, interactive documents.