Kino: an experimental, performant Ractor web server for Ruby 4 (Rust, Tokio, Hyper)

Rubyists who experiment with Ractors, put them to work! Meet Kino, an experimental performant Rust/Ruby Ractor web server (with a threading fallback). Note that Ractors are officially experimental in Ruby 4.0, and so is this server. Rails cannot run on Ractors yet, but it will, sometime in the future. [more inside]

Try Matz via SSH

Matz is a statically linked, 3MB terminal binary focused on mruby. He answers questions from the mruby guide repository, indexed mruby source code, and mrbgem metadata. Try Matz via SSH. Free to use. Nothing to download or install: ssh matz@r.uby.dev.

Ruby Stained Glass Notes #01: This idea cost me an ice cream

This is episode #01 of the Ruby Stained Glass Notes, a pop-up newsletter in which I write about the process of building a stained-glass panel celebrating Ruby. In this episode I talk about the importance of materials in the design process, and how I came to find a drawing I like very much.

Deploying Rails in 2026 is no longer just about Heroku.

Railway, Render, Fly.io, DigitalOcean, AWS, and Google Cloud each offer different trade-offs in simplicity, cost, and scalability. [more inside]

How Rails Flash Survives One Redirect

Rails flash messages are request-to-request state, not view-level notices. This article traces how flash, flash.now, flash.keep, and flash.discard work through the session, and why messages leak, disappear, or bloat CookieStore sessions. [more inside]

Ruby bindings for the AWS CDK

The AWS CDK lets you define cloud infrastructure in a real language instead of hand-writing CloudFormation. Until now the choices have been TypeScript, Python, Java, Go and C#, never Ruby. There’s now a working implementation of Ruby support. [more inside]

Ruby Memes 2026-06-12: The "Cool" Reactionary

Ruby Memes 2026-06-12: The “Cool” Reactionary

We often focus on data structures and forget the operations they make possible.

Ruby’s each_cons is a perfect example. [more inside]

Is Coding Over? 5 Career Pivots for Rails Devs in the AI Era

If you spend any time on Tech Twitter lately, you might feel like the sky is falling. People are… [more inside]

Tests That Survive Change

How to write Ruby tests that survive refactoring: what to test, what to ignore, and how to keep doubles from going stale. [more inside]

Pterocos - Free online editor for Ruby (plus Python, SQL, Lua)

A browser-based editor that runs Ruby scripts instantly. [No installation, no account]. Perfect for quick prototyping and learning. Also supports Python, SQL (SQLite/DuckDB), Lua, and web code. [more inside]

Rails Health Check

A Rails engine (just added Rack support) that adds production-grade health check endpoints to any Rails app. Goes well beyond the built-in /up endpoint with 11 built-in checks, parallel execution, structured JSON responses, Prometheus metrics, and a clean configuration DSL.

RubyConf Austria and the future of Ruby conferences

I attended RubyConf Austria in Vienna. A first day AI panel left me wondering: if programming languages are becoming irrelevant, will Ruby conferences still matter? Then, the next day, I noticed what to me looked like clues pointing to an answer: RubyConf Austria and the future of Ruby conferences

The Constant Frozen at Boot Bug: A Ruby Exercise For An Interview

Better guides. Better framework.

From Active Job and Action Cable to PostgreSQL improvements and Ractor safety, here’s a quick look at this week’s Rails updates. [more inside]

Demystifying Rails Magic: How Autoloading Actually Works

I remember when I first started learning Ruby outside of Rails. I was building a small script, and my… [more inside]

gem ActiveHarness to build advanced AI pipelines

ActiveHarness is being under active development and recently new README and a bunch of new documentation pages were added and updated. You are welcome to check and leave you feedback or ideas in Issues on GH. Happy coding!

A Rails model is a miniature language.

Associations, validations, scopes, enums, callbacks… All powered by Ruby methods. #Ruby #Rails #ActiveRecord [more inside]

Ruby Reactor 0.4.0: Interrupts, Dashboard, and Coordination Primitives

You’ve built a checkout flow. The user submits their order, you reserve inventory, charge their card, and generate a shipping label. Everything’s a Sidekiq job. It works. [more inside]

Stripe-Style IDs in Rails: A Guide to the make_id Gem

If you have ever used the Stripe API, you’ve noticed their IDs look awesome. Instead of a random… [more inside]

Rapid UI Development: Top 4 Component Kits for Solo Rails Devs

I remember the days when building a professional-looking dashboard in Rails meant spending a whole… [more inside]

Andy's Laws of AI in Software Engineering

Andy’s Laws of AI in Software Engineering:

We spend so much time chasing the big topics that we often overlook the things we use

A Rails request isn’t a straight line. [more inside]

How to Leverage PurgeCSS in Your Rails App for Faster Stylesheets

It’s common for Rails applications to serve massive CSS files filled with unused Bootstrap, Tailwind, or custom utility classes as projects grow. [more inside]

AI Document assistant

AI Document Assistants are transforming the way we handle information. By automating repetitive tasks and providing intelligent insights, they make document management more efficient and less time-consuming.