# tweenjs/tween.js

JavaScript/TypeScript animation engine

Repository: https://github.com/tweenjs/tween.js
Canonical: https://ross.abutalabs.com/products/tweenjs
Homepage: https://tweenjs.github.io/tween.js/
Language: TypeScript
License: NOASSERTION
License Family: other
Topics: tween, tweenjs, animation, javascript, typescript, easing, easing-functions, easing-equations, interactive, interaction, easing-curves
Last push: 2025-01-11T02:00:20+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5941, "days_push": 600, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 10136, forks 1402 (observed 2026-08-28T04:10:39.633709+00:00)

## What it is
tween.js is a JavaScript/TypeScript tweening engine for easy animations, incorporating optimized Robert Penner's easing equations. It tweens properties of any object over time and integrates into any animation loop you provide.

## Use cases
- animate dom element properties with easing
- tween object properties over time in javascript
- smooth easing animations for web ui
- create tweened animations for canvas or webgl
- interpolate numeric values with easing functions
- add animation to a three.js scene

## When to choose
- you want a small, focused tweening library that only interpolates object properties
- you need reusable easing functions or custom easing curves
- you want to plug tweens into your own animation loop
- you need a battle-tested library with TypeScript support

## When to avoid
- you need CSS unit handling or color interpolation out of the box
- you want a full-featured animation framework with built-in animation loops and timelines
- you need keyframe-based CSS animation tooling

## Facets
- artifact type: library
- maturity: stable
- function: animation, ui-components
- domain: web-development, frontend, graphics
- platform: browser
- tags: tweening, easing-functions, robert-penner-equations, interpolation, request-animation-frame, nodejs, javascript, typescript

## Member repositories
- tweenjs/tween.js (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:39.633709+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 2026-08-29T17:19:42.176532+00:00, confidence not recorded.
  - readme: https://github.com/tweenjs/tween.js (fetched 2026-08-28T04:10:39.633709+00:00, sha fd097e83cb05)
  - homepage: https://tweenjs.github.io/tween.js/ (fetched 2026-08-29T08:19:39.580256+00:00, sha 619f6ca58bdf)
  - registry_npm: https://registry.npmjs.org/tween.js (fetched 2026-08-29T08:19:39.589434+00:00, sha ca8fbb548584)
- Data as of 2026-08-30T08:39:29.467469+00:00.