Tangle in, simple sketch out At a cafe table, one person pulls a snarled knot of string into a single clean line that lands as a small drawing on a napkin; the other person lights up with understanding. Tangle in, simple sketch out find the one thread worth keeping — and draw it on a napkin a knotted idea one clear sketch Complex ideas, made simple.
Start here · a Napkin-Solo explainer

Attention Is All You Need

The 2017 paper that introduced the Transformer — the architecture that started modern LLM design, and still sits under almost every AI today. We took it apart and drew it as six plain sketches.

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a place to practice

Dōjō

Dōjō — a place to practice. Flashcards and spaced repetition for the interesting ideas school skipped. Pick a topic, study a few cards, and they stick.

Enter Dōjō →
Japan MindLost in TranslationFirst PrinciplesCity MakersDesign Eye

Why this exists

Complex ideas are hard to hold onto. A dense paper, a subtle finding, a tangled concept — most of it fades soon after you read it. Napkin Solo exists to change that: to take difficult ideas and make them easy to grasp and hard to forget. What reaches you is disarmingly simple — a single picture that makes an idea click and stays with you. Behind that simplicity is an AI-assisted engine we have spent a long time building and refining.

How it works

Every sketch starts from a real source and follows the same path.

A document or research paper
a paper, report, or study
Broken into its core ideas
the essence, pulled out
You choose one — or several
the ones that matter to you
Each becomes a sketch
simple, easy to understand, hard to forget