01 / Technologies / Framework

Detect Rails in any GitHub repo

Ruby on Rails is the convention-over-configuration web framework for Ruby, with Active Record, Hotwire and generators.

Why show Rails on your README

Rails repos are detected from their Gemfile and config layout, so the card stays correct as gems are added or removed.

How Rails is detected

Stack Fingerprint reads the repo's full file tree in one GitHub API call and flags Rails when it finds any of these:

  • Files or folders: Rakefile, config.ru
  • Dependencies in Gemfile: rails, ruby-on-rails

Rails README badge

A static badge you can paste anywhere in Markdown:

Rails badge

Markdown
![Rails](https://img.shields.io/badge/Rails-CC0000?style=for-the-badge&logo=rubyonrails&logoColor=white)

Or let the repo describe itself

Static badges go stale the moment you swap a dependency. A Stack Fingerprint card is generated from the repo, so Rails (and everything around it) appears or disappears on its own:

Tech stack card for rails/rails
rails/rails · generated live from the repo
README.md
[![Stack Fingerprint](https://stackfingerprint.vercel.app/api/card?repo=OWNER/REPO)](https://stackfingerprint.vercel.app/?repo=OWNER/REPO)

Replace OWNER/REPO with your repository, or open the builder to pick a theme and layout.