Bootstrap allows for the creation and customization of responsive & mobile-first sites. The software features a front-end open-source toolkit, with Sass variables and mixins. Bootstrap includes a responsive grid system, pre-made components, and powerful JavaScript plugins. The installation of the Sass and JavaScript source files from Bootstrap can be done via npm, Composer, or Meteor. With Bootstrap icons, the software provides its own open-source SVG icon library. With this, icons can be implemented in various ways as SVGs and designed with CSS. Furthermore, Bootstrap Themes can be installed as an additional plugin. These include various designs and templates for different websites and topics. The download of Bootstrap is free. Individual prices can be requested on the website.