Inspect, parse, and visualize the callbacks registered on your ActiveRecord models — including their if/unless conditions — as graphs and diagrams.

A static architecture linter for Ruby and Rails. Declare your components, dependencies, and boundaries in one file, then check every change in CI. It reads source with Prism and never boots the app.

Astel provides reusable, Prism-native AST utilities for Ruby tooling.

An AST transformation framework.

Auditions scripts, gems, Rack apps, and Rails applications for the ability to run under Ractors: static analysis of Ractor-isolation violations plus dynamic in-Ractor probing, with explanations and fixes.

A command-line tool that automatically converts RSpec's `let` and `let!` declarations to `let_it_be` where it's safe to do so.

browsable audits a Rails application's CSS, HTML, ERB, and JavaScript and reports which browsers can actually render and run it, then compares that against the project's declared allow_browser policy. It is a thin Ruby orchestrator over best-in-class external tools (Herb, stylelint, eslint).

Automatically adds includes/preload to fix N+1 queries detected by Bullet

CallMap statically analyzes a Rails application and prints the method call chain from a controller action as a stable text tree, including before_action callbacks. It is a code-reading aid focused on application code, not a full static analyzer.

A simple yet powerful tool to analyze method usage in Ruby/Rails codebases. Track which methods are called most frequently, filter by receivers or method names, and export results in table, JSON, or CSV format. Perfect for understanding code patterns, refactoring decisions, and identifying heavily-used APIs.

Gems with native extensions are the main bottleneck for a user when running `bundle install`. This gem aims to provide the Ruby community an easy to opt-in and quick way to distribute their gems with precompiled binaries. This toolchain works with a native CI based compilation approach using GitHub actions. It piggyback on top of popular tools in the Ruby ecosystem that maintainers are used to such as Rake Compiler and ruby/setup-ruby.

CodePicture lexes your code and assign a color to each token. Then, it generates a picture with the same size as the code, where each pixel represents a token.

Community

Rails gem that integrates via generators to analyze codebases and generate comprehensive test implementations using Prism, RuboCop, and RSpec

Check project's files for nonexistent constants

Degem finds unused gems in the Ruby bundle (ie, an app with a `Gemfile` or a gem with both a `Gemfile` and a gemspec).

An experimental gem that helps you rewrite deprecated code automatically.

Tool to visualize Ruby class dependencies

Code supporting deployments.

Discodactyl is an experimental toolkit for XRD service discovery documents and related protocols. It includes implementations of XRD URITemplate Link-Patterns, basic site-meta support, HTTP Link header parsing, acct: URIs and a webfinger poking stick.