GOV.UK Design System vs UI Prep Design System

The GOV.UK Design System helps government teams build services with shared styles, reusable components and patterns for user-focused tasks. Its guidance covers page structure, typography, colour and images; components include coded examples, and patterns address particular tasks and page types. Published guidance includes details about user-research testing. Teams can add GOV.UK Frontend through npm or include compiled files. In production projects, components can be used as HTML or as Nunjucks macros when Frontend is installed with npm and the application uses Node.js. Prototyping requires GOV.UK Prototype Kit version 7 or later. The code is public under the MIT License, and the listed plan is free. The system aims for WCAG level AA compliance, but its use alone does not make a service accessible; component accessibility checks combine tools, automated deployment tests and manual testing. The Government Digital Service maintains the system, with a focus on central UK government digital services. Support may be limited for other contexts. Compiled files include all Frontend CSS and JavaScript, without selective component assets or a customizable build.

UI Prep Design System is a Figma kit for building interfaces with reusable components, variables, and styles. Figma Variables organize primitive and semantic colors, spacing, sizing, and corner radius. One-click light and dark modes support a multi-brand setup. Components use Auto Layout, variants, properties, exposed nested instances, and interactive prototyping features. The maker says the kit meets WCAG 2.1 contrast ratios and uses an 8pt base unit. Primitive color variables can update semantic variables; number variables change component sizing and spacing; text styles can be updated with the Batch Styler plugin. The Free Demo costs nothing. Individual costs $99, paid once, and Team costs $199, paid once. A free Figma account is sufficient, but using the kit as a Figma library requires Team Library on a paid Figma plan. The license permits customized commercial, client, and personal projects.