Bootstrap is an open-source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.
Love Bootstrap’s grid and components but want different workflows? Try Tailwind CSS for utility-first speed, Bulma for a simple grid, shadcn/ui for polished React components, or go component-driven with React and multi-platform via Flutter.