Learn from real,
open-source Rails apps.

A small, hand-picked library of exemplary open-source apps worth reading to see how production-quality Rails is built today.

37signals

Campfire

A complete, real-time group chat app — a compact masterclass in server-rendered Hotwire and lean, dependency-light Rails.

  • Hotwire
  • Turbo Streams
  • Action Cable
37signals

Writebook

A self-hosted platform for publishing books on the web, showcasing clean model design, Active Storage, and rich text editing.

  • Active Storage
  • Action Text
  • Auth
37signals

Fizzy

A Kanban board reimagined — drag-and-drop boards built with modern Hotwire patterns and crisp, RESTful controllers.

  • Hotwire
  • Stimulus
  • RESTful design

About this library

This is a curated library, and the bar for inclusion is intentionally high. An app is listed here only if it is open source under a permissive license, written in idiomatic and modern Rails, and worth reading end to end to learn how a real, production-quality Rails application is built.