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Which AI Coding Tool?

Claude Code, Codex, Gemini CLI, Cursor, Grok, Kimi — what each is actually good at, and how to choose without burning a month. Free: 6 lessons in 2 levels, about 29 minutes.

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Lesson 1 — How to choose an AI coding tool

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⌘K — search the whole course: commands and glossary terms too.

Level 0. Picking a tool

The questions that actually decide it

0/2

Level 1. Head to head

The agents, compared on real work

0/4
What's nextClaude Code from ZeroAnthropic's coding agent, end to end: install it, point it at a project, and get real work done.

More in this track: The tools

Claude Code from ZeroAnthropic's coding agent, end to end: install it, point it at a project, and get real work done.Claude Code: Pro LevelControl the session, permission modes and the sandbox, hooks and plugins, and Claude Code in scripts and CI — with safe limits.Codex from ZeroOpenAI's terminal agent, Codex CLI: install and sign in, a first session you can undo, AGENTS.md, and the approvals and sandbox that decide what it may do.Gemini CLI from ZeroGoogle's open-source terminal agent: who should use it and who Antigravity CLI replaced it for, install and sign-in, a first session, GEMINI.md, and approval modes.

Frequently asked questions

Is "Which AI Coding Tool?" free?

Yes, the whole course is free — no ads, no paywall, no hidden charges. You can support the project if you want to, but it changes nothing about your access to the lessons.

Do I need to install anything or sign up?

No. Everything runs in your browser, and your progress is saved in this browser. To move it to another device, download a backup from settings.

Who is this course for?

Anyone choosing a tool. It builds up from the simplest possible starting point, so no prior experience is assumed.

How many lessons is it, and how long will it take?

6 lessons. Go at your own pace — one short lesson a day, or several in a sitting.

Is there a certificate?

Yes. Finish every lesson and you unlock a personalized certificate you can share.