# gosub-io/gosub-engine

The Gosub browser engine

Repository: https://github.com/gosub-io/gosub-engine
Canonical: https://ross.abutalabs.com/products/gosub-engine
Homepage: https://gosub.io
Language: Rust
License: MIT
License Family: permissive
Topics: browser, html5, rust
Last push: 2026-08-24T03:07:26+00:00

## Health v2 (maintenance only)
Score: 82/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 60, longevity 80
- inputs: {"age_days": 1121, "days_push": 9, "days_rel": 7, "gap_med": null, "n_releases_24m": 1}
- flags: prerelease_only
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3676, forks 182 (observed 2026-08-28T04:08:13.637541+00:00)

## What it is
Gosub is a modular, embeddable web browser engine written from scratch in Rust, with spec-compliant HTML5 and CSS3 parsers, an async networking stack, and pluggable render backends (Cairo, Skia, Vello) and JavaScript engines (V8). It is a community-driven project aiming to diversify the browser engine landscape, currently in active early-stage development.

## Use cases
- embed a browser engine in a Rust application
- build a custom web browser with pluggable components
- parse HTML5 documents in Rust
- parse and validate CSS3 in Rust
- render web content headlessly
- run a browser engine compiled to WebAssembly
- experiment with alternative browser engine architectures

## When to choose
- you want to build a custom browser or embed web rendering in a Rust app
- you need spec-compliant HTML5/CSS3 parsing as standalone crates
- you want to swap rendering backends or JavaScript engines
- you want to contribute to or study browser engine internals

## When to avoid
- you need a production-ready engine with full web standards support today
- you just need to display web content without customization (use WebView or an existing browser)
- you need mature JavaScript/DOM support for real-world sites

## Facets
- artifact type: library
- maturity: experimental
- function: parser, http-client, graphics, interpreter
- domain: web-development, browser-extensions, developer-tools
- platform: rust, cross-platform, wasm, windows
- tags: browser-engine, html5-parser, css3-parser, render-backend, v8, embeddable, modular, linux, macos

## Member repositories
- gosub-io/gosub-engine (main) score 82

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:13.637541+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 2026-08-29T18:31:16.279590+00:00, confidence not recorded.
  - readme: https://github.com/gosub-io/gosub-engine (fetched 2026-08-28T04:08:13.637541+00:00, sha 79f2a8122b15)
  - homepage: https://gosub.io (fetched 2026-08-29T09:25:18.266904+00:00, sha 71a39aee578a)
  - site_page: https://gosub.io/about (fetched 2026-08-29T09:25:18.276058+00:00, sha ddd77fd3aca4)
  - site_page: https://gosub.io/faq (fetched 2026-08-29T09:25:18.277828+00:00, sha 58dccd66f79e)
- Data as of 2026-08-30T08:39:29.467469+00:00.