# Prinzhorn/skrollr

Stand-alone parallax scrolling library for mobile (Android + iOS) and desktop. No jQuery. Just plain JavaScript (and some love).

Repository: https://github.com/Prinzhorn/skrollr
Canonical: https://ross.abutalabs.com/products/skrollr
Homepage: http://prinzhorn.github.io/skrollr/
Language: HTML
License: MIT
License Family: permissive
Archived: true
Last push: 2018-01-23T20:05:59+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5281, "days_push": 3144, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 18416, forks 3390 (observed 2026-08-28T04:11:26.647706+00:00)

## What it is
skrollr is a stand-alone, dependency-free JavaScript library for parallax scrolling and scroll-driven CSS animations on desktop and mobile browsers. Animations are defined declaratively via HTML data attributes and keyframes rather than JavaScript code.

## Use cases
- add parallax scrolling effects to a website
- animate CSS properties based on scroll position
- create scroll-driven animations without jQuery
- build parallax pages that work on mobile browsers
- define scroll animations declaratively in HTML
- animate colors, transforms, and numeric CSS properties on scroll

## When to choose
- you need a tiny (~12k) dependency-free scroll animation library for legacy browser targets
- you want designer-friendly animations defined in plain HTML/CSS with no JavaScript skills
- you are maintaining an existing site already built with skrollr

## When to avoid
- you are starting a new production project - the library has been unmaintained since 2014 and may break in modern browsers, especially mobile
- you need modern scroll animation features - use native CSS scroll-driven animations or actively maintained libraries instead
- you require guaranteed compatibility with current mobile browsers, which the author explicitly warns about

## Facets
- artifact type: library
- maturity: abandoned
- function: animation, frontend-framework, ui-components
- domain: web-development, frontend, web-design
- platform: browser, cross-platform
- tags: parallax-scrolling, scroll-animations, vanilla-javascript, css-animations, keyframes, unmaintained, mobile

## Member repositories
- Prinzhorn/skrollr (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:26.647706+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 2026-08-29T17:02:03.030458+00:00, confidence not recorded.
  - readme: https://github.com/Prinzhorn/skrollr (fetched 2026-08-28T04:11:26.647706+00:00, sha d8fd7c880163)
  - homepage: http://prinzhorn.github.io/skrollr/ (fetched 2026-08-29T07:59:40.951730+00:00, sha 90061bf7b7a5)
- Data as of 2026-08-30T08:39:29.467469+00:00.