altair-viz/altair
Grade a repo

98

/ 100

GradeA

A top-tier open source project. Docs, tests, and CI are all in excellent shape.

Top 3% of 5,156 graded repos

Declarative visualization library for Python

Documentation96
Engineering99
Health100
Python10,415BSD-3-Clause1mo ago

Outstanding. A score of 98/100 puts this repo in a very small tier of truly well-engineered projects.

Top fixes

Highest-impact changes first, ranked by point weight

3 to address
  1. 1
    Install and run instructions9pt

    Add a .env.example listing all required environment variables so contributors know what to set up.

  2. 2
    Reproducibility6pt

    Add a Dockerfile, .nvmrc, or .python-version to pin the runtime version and make the environment reproducible.

  3. 3
    Contributing guide5pt

    Show new contributors how to get a local dev environment running.

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Scorecard

Every check, grouped by category and sorted worst-first

Documentation

96

Install and run instructions9pt90

README documents how to install the project.

Contributing guide5pt93

Contributing guide is detailed and thorough.

README12pt100

README is present.

License6pt100

Licensed under BSD-3-Clause.

Engineering

99

Reproducibility6pt90

Lockfile present (uv.lock). Installs are reproducible.

Tests18pt100

Test files detected (tests).

CI/CD14pt100

CI is configured (.github/workflows/build-free-threaded.yml).

Linting and formatting5pt100

Linter or formatter configured ([tool.ruff] / [tool.black] in pyproject.toml).

Issue and PR templates6pt100

Issue or PR templates present.

Project health

100

Dependency manifest6pt100

Dependency manifest found (pyproject.toml).

Repository metadata5pt100

Repository has a description.

Activity5pt100

Actively maintained (pushed within the last month).

Housekeeping3pt100

.gitignore present.

Repository health signals

Activity, community, and responsiveness at scan time

Activity

  • 12 / 55
    Commits (30d / 90d)
  • 858
    Forks
  • 37
    Releaseslatest 7y ago

Community

  • 87% - Good
    Community health
  • 3 bus factor
    authors own >50% of commits
  • 10,415
    Watchers

Responsiveness

  • 11h
    Median issue response
  • <1h
    Median PR merge time
  • 148
    Open issues
Repository files20 root entries
  • .github
    Good: CI is configured (.github/workflows/build-free-threaded.yml).
    Good: Dependabot covers 2 ecosystems (github-actions, uv). Dependencies stay current.
    Good: Issue or PR templates present.
  • altair
  • design
  • doc
  • images
  • paper
  • sphinxext
  • tests
    Good: Test files detected (tests).
  • tools
  • .gitattributes
  • .gitignore
    Good: .gitignore present.
  • CODE_OF_CONDUCT.md
    Good: Code of conduct present.
  • cog.toml
  • CONTRIBUTING.md
    Good: Contributing guide is detailed and thorough.
    Issue: Contributing guide lacks a setup section (−12 pts).Fix: Show new contributors how to get a local dev environment running.
    Good: Contributing guide describes code style expectations.
    Good: Contributing guide explains how to run tests.
    Good: Contributing guide describes the PR/review workflow.
    Good: Contributing guide includes code examples.
  • LICENSE
    Good: Licensed under BSD-3-Clause.
  • NOTES_FOR_MAINTAINERS.md
  • pyproject.toml
    Good: Dependency manifest found (pyproject.toml).
  • README.md
    Good: README is present.
    Good: README is well structured with multiple sections.
    Good: README includes screenshots or visuals. Great for first impressions.
    Good: README has code examples.
    Good: README links to a live demo or deployed app.
    Good: README includes status badges.
    Good: README documents how to install the project.
    Good: README documents how to run the project.
  • RELEASING.md
  • uv.lock
    Good: Lockfile present (uv.lock). Installs are reproducible.
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