# google/lullaby

A collection of C++ libraries designed to help teams develop virtual and augmented reality experiences

Repository: https://github.com/google/lullaby
Canonical: https://ross.abutalabs.com/products/lullaby
Language: C++
License: Apache-2.0
License Family: permissive
Topics: vr, ar, android, ios, linux, windows, daydream, daydream-controllers
Archived: true
Last push: 2025-05-17T21:14:20+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 22, release rhythm 35, longevity 100
- inputs: {"age_days": 3373, "days_push": 473, "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 1198, forks 160 (observed 2026-08-28T04:03:57.634037+00:00)

## What it is
Lullaby is a collection of high-performance C++ libraries from Google for building virtual and augmented reality experiences. It provides an entity-component-system architecture, VR UI widgets, animation, spatial audio, and data-driven development tools across Android, iOS, Linux, and Windows.

## Use cases
- build a VR app in C++ for Android
- render 3D VR environments with panoramic images and spatial audio
- create VR user interfaces with buttons, labels, and reticles
- integrate VR rendering into an existing Android app via a Java API
- support Daydream and Cardboard headsets and controllers

## When to choose
- you are building a VR/AR experience in C++ on Android, iOS, Linux, or Windows
- you want an entity-component-system engine tuned for VR performance
- you need VR UI widgets and animation out of the box

## When to avoid
- you need a polished, well-documented framework - the external release is a work-in-progress
- you want to contribute code - pull requests are not currently accepted
- you are targeting modern AR platforms like ARCore or ARKit specifically

## Facets
- artifact type: library
- maturity: maintenance
- function: graphics, game-engine, animation, ui-components, audio-processing
- domain: graphics, cross-platform
- platform: windows, cpp
- tags: vr, ar, entity-component-system, spatial-audio, daydream, cardboard, 3d, game-development, android, ios, linux

## Member repositories
- google/lullaby (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:57.634037+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 2026-08-30T06:21:09.654966+00:00, confidence not recorded.
  - readme: https://github.com/google/lullaby (fetched 2026-08-28T04:03:57.634037+00:00, sha 8b6e053d5a38)
- Data as of 2026-08-30T08:39:29.467469+00:00.