The GOV.UK Design System is the UK government's open-source library of styles, accessible components, and patterns for building consistent, user-centered digital services, from form inputs to full task flows like entering an address.
Each component includes coded examples that render identically whether used through the GOV.UK Prototype Kit or GOV.UK Frontend, so a prototype built for stakeholder review and the eventual production build stay visually identical, no redesign gap between the two.
Designers and developers building government or civic digital services who need proven, accessible task-completion patterns (forms, verification, account creation) rather than generic marketing-site components.
The code is MIT-licensed and fully open source on GitHub, genuinely installable and reusable well beyond UK government projects.
The design system behind GOV.UK, built for accessible, inclusive government services.
