10 free tools · No login needed
Reading about tokens and context windows only gets you so far. Play with them instead — type, drag, and watch the concept click. Trusted by 350K+ learners on explainx.ai.
Type anything and watch it split into tokens live — the units LLMs actually read and get billed for.
See how much of a model's context window your text fills up, and what happens when you run out of room.
Fill in Format, Role, Objective, Goal, and Context — get a copy-ready structured prompt in seconds.
Three tiny games show what supervised, unsupervised, and reinforcement learning actually mean.
Drag two sliders and watch a real, tiny neural network turn them into a decision, live.
Watch AI write one word at a time by predicting what's most likely to come next.
Ask a question, watch notes get retrieved, then see a grounded answer versus a hallucination.
Click two words and see why similar meanings sit near each other — the idea behind vector search.
Click a word and see which others a toy transformer looks at — including the classic “it” puzzle.
Watch a pasted email try to override a support agent, then flip a switch that treats it as data.
No. Every tool under /practice runs entirely in your browser, with no login, signup, or data collection. Nothing you type is saved or sent to a server.
Yes, all of them, permanently. They're built to make abstract AI concepts — like tokens and context windows — concrete by letting you experiment directly instead of just reading about them.
Yes. This page will grow with more hands-on tools for AI concepts. Each one pairs an interactive playground with a short, linked explainer article for anyone who wants the deeper background. Newest: RAG, embeddings, attention, and prompt injection.
