# foundation/foundation-sites

The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites that work on any kind of device.

Repository: https://github.com/foundation/foundation-sites
Canonical: https://ross.abutalabs.com/products/foundation-sites
Homepage: https://get.foundation
Language: HTML
License: MIT
License Family: permissive
Last push: 2025-01-21T22:11:53+00:00

## Health v2 (maintenance only)
Score: 24/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 2, release rhythm 8, longevity 100
- inputs: {"age_days": 5438, "days_push": 589, "days_rel": 705, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 29784, forks 5391 (observed 2026-08-28T04:11:53.671721+00:00)

## What it is
Foundation for Sites is a responsive front-end framework providing HTML, CSS (Sass), and JavaScript components for building websites and apps that work on any device. It includes a customizable responsive grid, Sass mixins, JavaScript plugins, accessibility support, and a companion framework for responsive HTML emails.

## Use cases
- build responsive websites that work on any device
- rapidly prototype web layouts with a grid system
- create accessible UI components like modals, tabs, and navigation
- customize styles with Sass mixins and variables
- design responsive HTML emails that work in Outlook
- build mobile-first content-focused sites

## When to choose
- you need a mature, accessibility-focused responsive CSS framework
- you want deep Sass customization and semantic markup
- you're building responsive HTML emails including Outlook support
- you prefer a component library over utility-first CSS

## When to avoid
- you want a utility-first framework like Tailwind CSS
- you need a React/Vue component ecosystem with active modern tooling
- you require frequent updates - development activity has slowed
- you're building a highly interactive SPA better served by a JS framework

## Facets
- artifact type: framework
- maturity: maintenance
- function: frontend-framework, ui-components, css-framework, templating, accessibility
- domain: web-development, frontend, web-design, email, accessibility
- platform: browser, cross-platform
- tags: responsive-design, sass, grid-system, html-email, javascript-plugins, mobile-first, prototype-to-production, nodejs

## Member repositories
- foundation/foundation-sites (main) score 24

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:53.671721+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 2026-08-29T16:52:53.092375+00:00, confidence not recorded.
  - readme: https://github.com/foundation/foundation-sites (fetched 2026-08-28T04:11:53.671721+00:00, sha b03a030b7f54)
  - homepage: https://get.foundation (fetched 2026-08-29T07:50:05.612802+00:00, sha c91b6fa707d1)
  - site_page: https://get.foundation/showcase/about.html (fetched 2026-08-29T07:50:05.623320+00:00, sha d4f0f4eff77f)
  - site_page: https://get.foundation/sites/getting-started.html (fetched 2026-08-29T07:50:05.625751+00:00, sha 3cad3b19526f)
  - site_page: https://get.foundation/sites/docs (fetched 2026-08-29T07:50:05.627605+00:00, sha 0e6da3ea1757)
  - site_page: https://get.foundation/emails/getting-started.html (fetched 2026-08-29T07:50:05.629513+00:00, sha e8e72309e469)
  - site_page: https://get.foundation/emails/docs (fetched 2026-08-29T07:50:05.631741+00:00, sha 2efd35311e55)
  - site_page: https://get.foundation/develop/getting-started.html (fetched 2026-08-29T07:50:05.636946+00:00, sha 0cdbfc98c408)
  - site_page: https://get.foundation/frameworks-docs.html (fetched 2026-08-29T07:50:05.639391+00:00, sha 702350e2b29a)
  - site_page: https://get.foundation/get-involved/faq.html (fetched 2026-08-29T07:50:05.633929+00:00, sha 09c438c0404c)
- Data as of 2026-08-30T08:39:29.467469+00:00.