Debugging AI agents shouldn’t mean digging through endless JSON. AgentPrism, an open-source React component library by Evil Martians, turns raw OpenTelemetry traces into clear visualizations, instantly revealing loops, errors, and cost spikes. Built with Quotient AI, AgentPrism helps teams ship reliable, production-grade AI systems up to 5x faster.

Join me on a breathtaking journey as we add a client-side search to an SSG docs-first site, built with Astro!

Open source, talks around the world and prepping SFRuby for Nov 2025. Catch up Evil Martians' blog, open source, podcast, and get ready as we head for SFRuby Conference in San Francisco.

Learn how to build a dedicated API documentation repository that becomes your team's single source of truth, enabling true contract-first development.

Read how to accurately detect Safari and iOS versions using WebKit feature checks, behavioral tests, and selective UA hints to gate features safely and avoid breaking UX.

Flaky tests got you down? The Evil Martians formula stops chronic CI retry irritation! Clinically proven on ClickFunnels' massive test suite and dozens of developers!

CSS Color Module 4 adds oklch(), and we gain P3 wide-gamut support, boost code readability, and improve developer-designer communication.

Scale your Rails app without rewrites. Learn to keep business logic in Ruby and delegate heavy work to specialized tools, built with Go, C, and Rust, for performance and scalability.

Explore how the Active Agent library brings Rails conventions to AI development, with real-world examples from Evil Martians' early adoption experience

Evil Martians cut Whop’s Rails test suite and CI time in half using profiling, factory optimizations, and parallelization. Learn how we speed up tests and boost reliability.

This post covers the complex (but rewarding) process of building native language support for JetBrains from scratch. From crafting lexers and parsers to wrestling with soft keywords, PSI trees, and error recovery, this guide walks through the real stuff.

Rails isn’t dead, it’s thriving. Learn how Ruby on Rails survived the hype cycle, why startups like Chime and Figma still bet on it, and what it means for your next project.

Take a deep dive into what circuit breakers are, why you might need them, and the options you have in Ruby.

Introducing Redprints CFP, an open source CFP management application built for the SF Ruby Conference with Rails and Inertia.js.

We share what have we learned creating PostCSS and the huge ecosystem around it. Get 8 key lessons from Andrey Sitnik, creator of PostCSS.

Authors: Vladimir Dementyev, Principal Backend Engineer, and Irina Nazarova, CEOTopics: Real-time, Open Source, DX, Real-time featuresWe built AnyCable for Rails seven years ago. Now it's Laravel's turn.Read more

Has simplicity gone missing in web development? This investigative piece uncovers how Inertia.js + Rails defy JavaScript bloat and reclaim developer sanity.

A letter from the future about the 3-week endpoint waits, 2 AM staging environment debugging sessions, and why contract-first development changes everything. The hard-won wisdom of API development that nobody tells you until it's too late.

While designing a landing page template for dev tool startups, we reviewed 100+ real product sites. Along the way, we uncovered practical insights—here’s what’s worth knowing if you’re building one yourself.

The awesome Quotient team, a vision from the future, and a brilliant pivot. But if you're a visionary working on next-gen tech, you need to learn from the road we travelled on the way there!