# michalsnik/aos

Animate on scroll library

Repository: https://github.com/michalsnik/aos
Canonical: https://ross.abutalabs.com/products/aos
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2024-03-26T15:58:43+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4073, "days_push": 890, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 28056, forks 2630 (observed 2026-08-28T04:11:48.088157+00:00)

## What it is
AOS is a small JavaScript library that animates HTML elements as they scroll into view, driven by CSS transitions and data attributes. It offers built-in animation presets, easing options, and configurable settings like anchors and disable conditions.

## Use cases
- animate elements when they scroll into view
- add fade or slide animations to a landing page
- trigger CSS animations on scroll without writing JS
- add scroll reveal effects to a website
- animate sections as user scrolls down

## When to choose
- you want lightweight, dependency-free scroll animations
- you prefer declarative data-attribute configuration
- you need simple fade/slide/zoom effects on a static or framework site

## When to avoid
- you need complex timeline or physics-based animations
- you want scroll-linked (scrubbing) animations rather than one-shot triggers
- you need a maintained library with active development

## Facets
- artifact type: library
- maturity: maintenance
- function: animation, ui-components
- domain: frontend, web-development, web-design
- platform: browser
- tags: scroll-animations, css-animations, javascript, scroll-triggered, lightweight, nodejs

## Member repositories
- michalsnik/aos (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:48.088157+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 2026-08-29T16:54:27.870865+00:00, confidence not recorded.
  - readme: https://github.com/michalsnik/aos (fetched 2026-08-28T04:11:48.088157+00:00, sha 91ae4b2d9c7a)
  - registry_npm: https://registry.npmjs.org/aos (fetched 2026-08-29T07:51:28.515966+00:00, sha 5f37a1f40087)
- Data as of 2026-08-30T08:39:29.467469+00:00.