CodeTrain

CodeTrain is a hands-on AI coding trainer designed to help developers learn and understand their own codebase through interactive, step-by-step exercises. Unlike traditional AI code assistants that complete tasks for users, CodeTrain focuses on ensuring engineers truly understand the code they work with by requiring them to write every line themselves. The platform works by breaking down coding tasks into tiny, manageable steps presented in a real code editor with an instant Run button. Developers type each line of code themselves, and every step must run and pass before moving forward. This approach provides proof of actual understanding rather than just completion metrics. The AI tutor uses a Socratic method, asking questions, providing nudges and hints, and reviewing code, but never directly handing over solutions. CodeTrain operates on a local-first design philosophy. The free skill and codetrain agent keep code on the user's machine, with only small prompt snippets crossing the wire. Users can point the tool at any public repository from any tier to generate lessons directly from their actual codebase. On the Pro plan, users can work with their own private repositories, with code staying local on 127.0.0.1 and edits landing in real branches. Secrets and gitignored files are never read in either mode. The platform includes curated courses organized like a transit map, where each course is a line and each class is a stop. Available courses cover topics like How LLMs Actually Work, Learn to Code in Python, Object-Oriented Python, JavaScript Fundamentals, Command the Terminal, and more, with new courses rolling out regularly. Users can also request custom topics or point CodeTrain to teach any public repository. For engineering teams, CodeTrain offers additional features including onboarding journeys to accelerate new hire ramp-up, team usage and progress dashboards, per-seat budgets with central billing, and support for bring-your-own-key model deployments. Enterprise plans include SSO/SCIM, audit logs, and self-hosting options. The free tier provides 10 lessons per month from any public repo, a local profile with streaks, and access to the open-source skill. Pro starts at $24/month for real repository access, cross-device profile sync, and fair-use lessons with zero setup. Team pricing begins at $32 per seat per month with additional team management features.