# tachyons-css/tachyons

Functional css for humans

Repository: https://github.com/tachyons-css/tachyons
Canonical: https://ross.abutalabs.com/products/tachyons
Homepage: https://tachyons.io
Language: CSS
License: MIT
License Family: permissive
Topics: css, html, design, design-systems, design-patterns, design-tools, frontend, functional-css, responsive
Last push: 2026-07-20T15:11:15+00:00

## Health v2 (maintenance only)
Score: 83/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 93, release rhythm 61, longevity 100
- inputs: {"age_days": 4685, "days_push": 44, "days_rel": 44, "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 11716, forks 667 (observed 2026-08-28T04:10:49.561223+00:00)

## What it is
Tachyons is a functional (utility-first) CSS toolkit of small, single-purpose, composable classes for building responsive UIs without writing custom CSS. It ships a lightweight ~14kB stylesheet usable via CDN or npm, built with PostCSS and organized into small readable modules.

## Use cases
- rapidly prototype web UIs without writing CSS
- build responsive mobile-first interfaces with utility classes
- create a consistent design system across projects
- minimize CSS payload sent to users
- style plain HTML, React, Angular, or Rails apps with the same classes
- debug and inspect layout issues in the browser

## When to choose
- you want utility-first CSS with a tiny footprint and excellent gzip compression
- you prefer composing single-purpose classes over writing semantic CSS
- you need a mobile-first, responsive framework that works with any JS framework or plain HTML
- you want an easy-to-read, modular CSS codebase you can customize and rebuild

## When to avoid
- you prefer component-scoped or semantic class naming over utility classes
- your team relies on a design system requiring heavy theming out of the box
- you need a large prebuilt component library rather than low-level building blocks
- you want a framework with frequent active development and new features

## Facets
- artifact type: library
- maturity: maintenance
- function: css-framework, ui-components, templating
- domain: web-development, frontend, web-design
- platform: browser, cross-platform
- tags: functional-css, utility-first, atomic-css, responsive-design, design-system, postcss, mobile-first, nodejs

## Member repositories
- tachyons-css/tachyons (main) score 83

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:49.561223+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 2026-08-29T17:15:23.129555+00:00, confidence not recorded.
  - readme: https://github.com/tachyons-css/tachyons (fetched 2026-08-28T04:10:49.561223+00:00, sha b93b15a95b40)
  - homepage: https://tachyons.io (fetched 2026-08-29T08:13:37.596310+00:00, sha 6f48b7011bdb)
  - site_page: https://tachyons.io/docs (fetched 2026-08-29T08:13:37.600721+00:00, sha 90ceb7631a3a)
- Data as of 2026-08-30T08:39:29.467469+00:00.