CodeTrain teaches developers on their own codebase, one tiny step at a time — they type every line, you see they learned it. No autocomplete doing the thinking for them.
Your code never leaves your machine. Free skill on GitHub · Pro from $24/mo.
Cursor and Copilot help write the code.
CodeTrain makes sure your team still understands it — and proves it.
As AI writes more of the code, the understanding behind it erodes. Juniors ship features they can't debug. Onboarding still takes months. "It works" stops meaning "we know why."
The discovery phase of learning — where understanding actually forms — gets skipped when the answer is one tab away.
Generic courses teach someone else's code. Your patterns, your standards, your gotchas go untaught.
Seniors burn their week answering the same questions. Skill doesn't compound; it leaks.
No videos, no toy exercises. A Socratic tutor that asks, nudges, reviews your submission, and runs the tests — but never hands you the answer.
Repo mode edits land in your real branch, so finished code is just part of your work. Sandbox mode is a throwaway project for practice. Either way it runs on 127.0.0.1 — your code stays local.
The tutor breaks the work into tiny steps in a real editor with an instant Run button. You type the line; it reviews what you wrote and explains what changed.
Stuck? It shrinks the step or reveals the next hint — never the solution. Failing code is the best teaching moment, so it leans in instead of bailing out.
A small local profile tracks your level, streak, and recurring gaps — and resurfaces what you struggled with later (spaced repetition). Sync it across machines on Pro.
Trained on your repo and standards — not generic katas (Codecademy, Scrimba) or someone else's curriculum.
Hands-on by design. Reading an explanation isn't learning; producing the code is. That's the difference from AI explainers.
Local-first agent. Bring your own Anthropic key for enterprise and nothing but a license check touches our servers.
A free tutor helps one dev. A team needs to standardize and measure understanding — onboard everyone on your codebase the same way, and prove it stuck.
Curricula built on your repo + standards. New hires ramp in weeks, not months — without tying up your seniors. Track who's ramped and where they're stuck.
Dashboards and skill-gap heatmaps turn "we did some training" into evidence. SSO, BYO-key, and self-host keep security and procurement happy.
Start free. Upgrade when you want your real repos, your own model key, or your whole team. No card to start.
No. The agent runs on your machine and serves the UI on localhost. On the managed plan, only short prompt snippets go to the model. On Bring-Your-Own-Key (Team/Enterprise), model calls go straight to Anthropic with your key — nothing but a license check touches our servers.
The opposite. Explainers do the work for you. CodeTrain makes you write every line, reviews it Socratically, runs your tests, and tracks what you didn't get so it can resurface it. You finish able to do it without help.
Those make your team faster at producing code. This makes sure they still understand it — and gives you a way to prove ramp and retention. Different job. They're complements, not competitors.
You connect your own Anthropic (or Bedrock) API key. Your code and prompts go directly to the model on your account — best for security and cost control — and we just provide the software, accounts, and dashboards.
Yes — the core tutor is a free, open skill you can run today. Paid plans add zero-setup managed access, your real repos, cross-device sync, and the team layer.
Spin up a session on your own repo in two minutes. Free to start.