Use this design system to make government apps consistent with GOV.UK. Learn from the research and experience of other app teams, GOV.UK Design System and avoid repeating work that's already been done.
Make services look and feel like GOV.UK using styles. Use pre-built reusable components to build consistent apps. Patterns are best practice design solutions for specific user-focused tasks and pages.
Open Government Licence (OGL) https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/