# microsoft/fast

The adaptive interface system for modern web experiences.

Repository: https://github.com/microsoft/fast
Canonical: https://ross.abutalabs.com/products/fast
Homepage: https://www.fast.design
Language: TypeScript
License: NOASSERTION
License Family: other
Topics: design-systems, design-architecture, component-architecture, component-library, components, react, development-tools, web-accessibility, animation-library, color-library, typescript, web-components, web-components-schemas, adaptive-ui, front-end-framework, web-standards
Last push: 2026-08-21T17:18:58+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 98, longevity 100
- inputs: {"age_days": 3106, "days_push": 12, "days_rel": 14, "gap_med": 0.0, "n_releases_24m": 21}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9668, forks 633 (observed 2026-08-28T04:10:36.643660+00:00)

## What it is
FAST is Microsoft's collection of tools for building standards-based Web Components, centered on the lightweight @microsoft/fast-element library. It lets developers create reusable, framework-agnostic UI components and design systems built on W3C Web Component standards.

## Use cases
- build reusable web components without a framework
- create a custom design system for my web app
- use fluent design components in any frontend framework
- lightweight ui component library with small bundle size
- framework-agnostic components that work with react vue or angular
- accessible web components based on web standards

## When to choose
- you want standards-based Web Components usable across any framework or none
- you need a small, tree-shakeable component library (~4.5kb optimized)
- you're building a custom design system with adaptive theming
- you need Fluent design language components

## When to avoid
- you want a full application framework with routing and state management
- your team prefers framework-specific component ecosystems like React libraries
- you need a large out-of-the-box component catalog - the main component library lives in the Fluent UI repo

## Facets
- artifact type: library
- maturity: active
- function: ui-components, frontend-framework, templating, css-framework, animation
- domain: web-development, frontend, web-design, accessibility
- platform: browser, cross-platform
- tags: web-components, design-system, fluent-ui, adaptive-ui, component-library, w3c-standards, tree-shaking, web-server, typescript

## Member repositories
- microsoft/fast (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:36.643660+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:21:18.339024+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/fast (fetched 2026-08-28T04:10:36.643660+00:00, sha 47f22420d077)
  - homepage: https://www.fast.design (fetched 2026-08-29T08:21:29.465098+00:00, sha ce31c32dcff6)
  - site_page: https://fast.design/docs/3.x/introduction (fetched 2026-08-29T08:21:29.468869+00:00, sha ec210e26ffb6)
  - site_page: https://fast.design/docs/2.x/introduction (fetched 2026-08-29T08:21:29.470638+00:00, sha 82343ce952f9)
  - site_page: https://fast.design/docs/1.x/introduction (fetched 2026-08-29T08:21:29.472224+00:00, sha aae5999ca379)
- Data as of 2026-08-30T08:39:29.467469+00:00.