Powerful, extensible, and feature-packed frontend toolkit
The original responsive framework: components, grid and docs that bootstrapped the modern web.
Mark Otto and Jacob Thornton's 2011 framework invented the modern front-end toolkit: grid, components, and docs that thousands of sites copied. Bootstrap 5 dropped jQuery for vanilla JS, and its utility classes presaged Tailwind's rise. Still the fastest way to make something decent-looking in an afternoon.
Who it's for
Teams that need a battle-tested, responsive UI kit they can drop into any project and ship fast.
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