# russellsamora/scrollama

Scrollytelling with IntersectionObserver.

Repository: https://github.com/russellsamora/scrollama
Canonical: https://ross.abutalabs.com/products/scrollama
Homepage: https://russellsamora.github.io/scrollama/basic
Language: HTML
License: MIT
License Family: permissive
Last push: 2025-11-13T14:13:24+00:00

## Health v2 (maintenance only)
Score: 56/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 52, release rhythm 35, longevity 100
- inputs: {"age_days": 3239, "days_push": 293, "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 5999, forks 292 (observed 2026-08-28T04:09:34.146487+00:00)

## What it is
Scrollama is a lightweight JavaScript library for building scrollytelling experiences using the IntersectionObserver API instead of scroll events. It provides a simple interface for triggering step-based and progress-based callbacks as users scroll through a page.

## Use cases
- add scroll-triggered step callbacks to a data story
- build a sticky graphic that updates as the user scrolls
- create scroll-driven interactive visualizations with D3
- track incremental scroll progress through a section
- embed scrollytelling inside an iframe
- make scroll interactions performant without scroll event listeners

## When to choose
- you need performant scroll-driven step triggers in the browser
- you are building data journalism or narrative visualization pages
- you want a small dependency-free scrollytelling helper usable with any framework

## When to avoid
- you need full-viewport parallax or complex animation timelines rather than step triggers
- you must support very old browsers without an IntersectionObserver polyfill
- you want a full scrollytelling framework with layout and styling included

## Facets
- artifact type: library
- maturity: active
- function: animation, ui-components, frontend-framework
- domain: web-development, frontend, data-visualization
- platform: browser
- tags: scrollytelling, intersection-observer, scroll-driven-animations, data-journalism, storytelling, javascript

## Member repositories
- russellsamora/scrollama (main) score 56

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:34.146487+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 2026-08-29T17:49:49.343448+00:00, confidence not recorded.
  - readme: https://github.com/russellsamora/scrollama (fetched 2026-08-28T04:09:34.146487+00:00, sha 6afc6fbf573c)
  - homepage: https://russellsamora.github.io/scrollama/basic (fetched 2026-08-29T08:45:46.451412+00:00, sha c91cf0e031bb)
- Data as of 2026-08-30T08:39:29.467469+00:00.