# twbs/rfs

✩ Automates responsive resizing ✩

Repository: https://github.com/twbs/rfs
Canonical: https://ross.abutalabs.com/products/rfs
Language: CSS
License: MIT
License Family: permissive
Topics: scss, sass, responsive, font-size, frontend, rfs, stylus, postcss, css
Last push: 2026-08-10T23:18:31+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 8, longevity 100
- inputs: {"age_days": 3377, "days_push": 23, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3365, forks 210 (observed 2026-08-28T04:07:58.266492+00:00)

## What it is
RFS is a unit resizing engine that automatically rescales CSS values like font-size, margin, padding, and border-radius based on viewport dimensions. It is available as mixins/plugins for Sass, Less, Stylus, and PostCSS.

## Use cases
- make font sizes responsive across viewports
- fluidly rescale padding and margins in css
- prevent text from being chopped off on small screens
- keep typography proportional across breakpoints
- replace manual media queries for font resizing
- rescale css values with sass or postcss

## When to choose
- you use Sass, Less, Stylus, or PostCSS and want fluid, viewport-based value scaling
- you want readable text on small screens without hand-written media queries
- you want consistent proportional scaling of spacing and typography

## When to avoid
- your project uses plain CSS without a preprocessor or PostCSS
- you need fixed, non-fluid sizing
- you rely on a CSS framework that already handles fluid typography

## Facets
- artifact type: library
- maturity: stable
- function: css-framework, ui-components
- domain: frontend, web-development, web-design
- platform: browser, cross-platform
- tags: responsive-design, fluid-typography, sass, less, stylus, postcss, font-size, viewport-scaling, nodejs

## Member repositories
- twbs/rfs (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:58.266492+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 2026-08-29T18:40:18.440885+00:00, confidence not recorded.
  - readme: https://github.com/twbs/rfs (fetched 2026-08-28T04:07:58.266492+00:00, sha 83f5a9769871)
- Data as of 2026-08-30T08:39:29.467469+00:00.