The premier specialized IDE for modern JavaScript and TypeScript. Following its 2025 transition to a free non-commercial license, it is now the top choice for hobbyists wanting pro-grade tools. The 2025.3 update introduces native Claude Agent integration, a high-performance service-powered TypeScript engine, and unified settings for Bun, Deno, and Node.js. It remains heavier than text editors but offers unmatched deep-code analysis and out-of-the-box refactoring.

The industry's most powerful IDE for Ruby and Ruby on Rails. Since the late 2025 update (v2025.3), it is free for non-commercial use and features a Rails-aware MCP (Model Context Protocol) server for smarter AI assistance. It offers deep refactoring, integrated testing (RSpec, MiniTest), and a GUI-based debugger. While it has a higher RAM footprint than text editors, its new 'Islands' UI and faster multi-module startup make it the most productive environment for complex Rails apps.