KB Cafe
Learn AI free with hands-on tools, lessons and learning paths
KB Cafe is an AI knowledge base for developers that you learn from by using it. Pick a goal, such as building an agent, getting better answers or understanding tokens and context windows, and it points you at a path of lessons and small tools. Everything runs in the browser, so there is nothing to install.
Our verdict
A sensible first stop if you want to understand how AI behaves before you build on it. Try the token counter to see how text gets split, the prompt simulator to see why a prompt fails, then follow a learning path through agents, RAG or automation. The goal-first layout saves you picking from a long reading list.
Why we like it: You learn by trying things. A prompt builder, a token counter, a cron generator and an agent memory simulator sit next to the lessons that explain them, and the dictionary covers the jargon. The site says it collects nothing and asks no signup.
The catch: It is aimed at developers and people building with AI, so some tools assume technical background. The site also has a guide comparing its free learning with paid courses, and it names where paying genuinely wins.