# latex3/latex3

The expl3 (LaTeX3) Development Repository

Repository: https://github.com/latex3/latex3
Canonical: https://ross.abutalabs.com/products/latex3
Homepage: https://latex-project.org/latex3.html
Language: TeX
License: LPPL-1.3c
License Family: other
Topics: latex, latex3-development
Last push: 2026-08-26T13:17:00+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 5652, "days_push": 7, "days_rel": 16, "gap_med": 16.5, "n_releases_24m": 33}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2125, forks 212 (observed 2026-08-28T04:06:16.858914+00:00)

## What it is
The development repository for expl3, the LaTeX3 programming layer that forms the modern kernel of the LaTeX typesetting system. It contains the stable l3kernel code, experimental packages, and test material, all built on top of LaTeX2e.

## Use cases
- write LaTeX packages using the expl3 programming layer
- develop or contribute to the LaTeX3 kernel
- test experimental LaTeX3 interfaces before kernel integration
- understand how modern LaTeX internals are structured
- build document command syntax with xparse-style interfaces

## When to choose
- you are writing or maintaining LaTeX packages that use the L3 programming layer
- you need the stable expl3 kernel code or want to track its development
- you want to experiment with upcoming LaTeX3 interfaces

## When to avoid
- you just want to write LaTeX documents rather than program the kernel
- you need a stable, packaged release rather than development code
- you are looking for user-facing LaTeX documentation or tutorials

## Facets
- artifact type: library
- maturity: active
- function: programming-language, templating
- domain: documentation, developer-tools
- platform: cross-platform
- tags: latex, expl3, tex, macro-programming, typesetting, kernel-development, macro

## Member repositories
- latex3/latex3 (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:16.858914+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 2026-08-30T02:52:40.688295+00:00, confidence not recorded.
  - readme: https://github.com/latex3/latex3 (fetched 2026-08-28T04:06:16.858914+00:00, sha a7c94a057593)
  - homepage: https://latex-project.org/latex3.html (fetched 2026-08-29T10:32:39.151720+00:00, sha 5decb7b3c3c3)
  - site_page: https://latex-project.org/about (fetched 2026-08-29T10:32:39.154521+00:00, sha a2965fd7bd51)
  - site_page: https://latex-project.org/about/team (fetched 2026-08-29T10:32:39.157947+00:00, sha abde6eecbafb)
  - site_page: https://latex-project.org/help/documentation (fetched 2026-08-29T10:32:39.159545+00:00, sha 4b5e5ed0f76b)
- Data as of 2026-08-30T08:39:29.467469+00:00.