# thoughtbot/appraisal

A Ruby library for testing your library against different versions of dependencies.

Repository: https://github.com/thoughtbot/appraisal
Canonical: https://ross.abutalabs.com/products/appraisal
Homepage: https://thoughtbot.com
Language: Ruby
License: MIT
License Family: permissive
Topics: ruby, thoughtbot, appraisal, rubygems, testing, gemfile
Last push: 2025-09-08T14:17:05+00:00

## Health v2 (maintenance only)
Score: 41/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 41, release rhythm 8, longevity 100
- inputs: {"age_days": 5774, "days_push": 359, "days_rel": 677, "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 1325, forks 115 (observed 2026-08-28T04:04:22.450629+00:00)

## What it is
Appraisal is a Ruby library that integrates with Bundler and Rake to test your library against different versions of its dependencies in repeatable scenarios. It generates per-appraisal Gemfiles so you can run your test suite against multiple dependency versions, such as several Rails releases.

## Use cases
- test my ruby gem against multiple rails versions
- check for regressions across dependency versions
- run my test suite with different gemfile configurations
- maintain compatibility with older dependency versions
- set up repeatable bundler scenarios for gem testing

## When to choose
- you maintain a Ruby gem or library and need to support multiple dependency versions
- you want to catch regressions against older versions of Rails or other gems
- you already use Bundler and Rake in your test workflow

## When to avoid
- you are building an application rather than a reusable library
- you need to vendor gems locally or bundle to a non-global namespace, which is unsupported
- you only test against a single dependency version

## Facets
- artifact type: library
- maturity: active
- function: testing, dependency-audit, developer-tools
- domain: testing, developer-tools, version-control
- platform: ruby, cli
- tags: bundler, gemfile, dependency-versions, regression-testing, rubygems, rake

## Member repositories
- thoughtbot/appraisal (main) score 41

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:22.450629+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 2026-08-30T04:46:36.205702+00:00, confidence not recorded.
  - readme: https://github.com/thoughtbot/appraisal (fetched 2026-08-28T04:04:22.450629+00:00, sha f772242b06d3)
  - homepage: https://thoughtbot.com (fetched 2026-08-29T12:05:34.446865+00:00, sha 5510254df796)
  - site_page: https://thoughtbot.com/case-studies/closeknit-health (fetched 2026-08-29T12:05:34.455941+00:00, sha ec773542ed58)
  - site_page: https://thoughtbot.com/services (fetched 2026-08-29T12:05:34.457749+00:00, sha 5b152b8c27da)
  - site_page: https://thoughtbot.com/our-company (fetched 2026-08-29T12:05:34.459588+00:00, sha 9e2e18b981fb)
- Data as of 2026-08-30T08:39:29.467469+00:00.