# leapmotion/leapjs

JavaScript client for the Leap Motion Controller

Repository: https://github.com/leapmotion/leapjs
Canonical: https://ross.abutalabs.com/products/leapjs
Homepage: https://developer.leapmotion.com/leapjs
Language: JavaScript
License: Apache-2.0
License Family: permissive
Last push: 2025-02-24T13:39:44+00:00

## Health v2 (maintenance only)
Score: 26/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 8, release rhythm 8, longevity 100
- inputs: {"age_days": 4989, "days_push": 555, "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 2008, forks 434 (observed 2026-08-28T04:06:04.912628+00:00)

## What it is
LeapJS is the official JavaScript client library for the Leap Motion Controller, providing real-time hand and finger tracking data via a WebSocket connection to the Leap Motion service. It supports both browser and Node.js environments, includes a plugin system, and works with Ultraleap Gemini V5 and Hyperion V6 tracking software.

## Use cases
- track hand and finger positions in a web app
- build a hand-controlled cursor for on-screen interaction
- create gesture-based games in the browser
- read Leap Motion frames in a Node.js application
- build interactive 3D visualizations driven by hand motion
- extend Leap apps with modular plugins like screenPosition

## When to choose
- you are building JavaScript web or Node.js apps with a Leap Motion / Ultraleap controller
- you need real-time skeletal hand tracking data with a simple loop API
- you want a plugin ecosystem and vector math helpers bundled in

## When to avoid
- you don't have a Leap Motion or Ultraleap tracking device
- you need hand tracking without dedicated hardware (e.g., webcam-based)
- you're working in a non-JavaScript environment

## Facets
- artifact type: library
- maturity: maintenance
- function: sdk, websocket, animation
- domain: developer-tools, hardware, graphics, web-development
- platform: browser, cross-platform
- tags: leap-motion, hand-tracking, gesture-recognition, motion-controller, real-time, javascript, nodejs

## Member repositories
- leapmotion/leapjs (main) score 26

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:04.912628+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 2026-08-30T03:01:18.408137+00:00, confidence not recorded.
  - readme: https://github.com/leapmotion/leapjs (fetched 2026-08-28T04:06:04.912628+00:00, sha 63c960c27d7c)
  - registry_npm: https://registry.npmjs.org/leapjs (fetched 2026-08-29T10:41:23.979382+00:00, sha 999e71249aac)
- Data as of 2026-08-30T08:39:29.467469+00:00.