Rulerito is a free Chrome add-on designed to enhance the workflow of frontend developers, QA testers, and UI/UX designers. It provides precise real-time measurements of your viewport dimensions, enabling users to seamlessly test and adjust their web designs without the need for cumbersome DevTools. The tool sits unobtrusively in the corner of your browser, offering a non-intrusive interface that ensures your workspace remains clear and focused.

Key features include live dimension tracking, allowing users to see their current viewport width and height instantly. It also offers pixel-perfect resizing by enabling manual input of dimensions, along with the capability to save and switch between custom presets for different devices. With its clean and user-friendly design, Rulerito promises to enhance your responsive design process while maintaining your privacy by operating locally without tracking your data.