Responsable is described as 'responsive HTML CSS LESS SCSS framework with clean markup, normalized CSS, and responsive images. It allows for nested columns for easy grid nesting and customization, and provides base styles for forms, tables, and typography for faster startup on your projects' and is an app in the Development category. There are more than 50 alternatives to Responsable for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Bootstrap, which is both free and Open Source. Other great apps like Responsable are Materialize (Free, Open Source), Foundation (Free, Open Source), Purecss (Free, Open Source) and Tailwind CSS (Free, Open Source).