# Unity-Technologies/UnityCsReference

Unity C# reference source code.

Repository: https://github.com/Unity-Technologies/UnityCsReference
Canonical: https://ross.abutalabs.com/products/unitycsreference
Language: C#
License: NOASSERTION
License Family: other
Last push: 2026-08-26T15:34:37+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 3085, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 12967, forks 2553 (observed 2026-08-28T04:11:00.272023+00:00)

## What it is
The official C# reference source code for the Unity engine and editor, published by Unity Technologies. It is provided for reading and reference only under a reference-only license that forbids modification or redistribution.

## Use cases
- understand how Unity engine APIs work internally
- look up Unity editor C# implementation details
- debug unexpected behavior in Unity APIs
- learn engine architecture from real source code
- find undocumented parameters or behaviors in Unity classes

## When to choose
- you develop with Unity and want to inspect how engine and editor C# code works
- you need to trace API behavior that isn't covered by documentation

## When to avoid
- you want to copy, modify, or redistribute the code - the license forbids it
- you need the full engine including C++ sources - that requires a commercial source code license
- you want to contribute code - pull requests are not accepted

## Facets
- artifact type: learning-resource
- maturity: active
- function: developer-tools, game-engine, documentation
- domain: developer-tools, tutorials
- platform: cross-platform, cpp
- tags: unity, reference-source, c-sharp, engine-internals, read-only, game-development

## Member repositories
- Unity-Technologies/UnityCsReference (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:00.272023+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 2026-08-29T17:13:38.920644+00:00, confidence not recorded.
  - readme: https://github.com/Unity-Technologies/UnityCsReference (fetched 2026-08-28T04:11:00.272023+00:00, sha f5c5b401b46f)
- Data as of 2026-08-30T08:39:29.467469+00:00.