Write math the way you think it.

Flashcards with a Notion-like editor, a real math keyboard, and quiz grading that knows (x+1)^2 is the same as x^2+2x+1.

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An IDE for a single fact

Cards are files. Front and back stack on the left. Live KaTeX preview sits on the right. Drawings open in a full-screen canvas, not a cramped sidebar.

Inline math that stays a node.Type $x^2$ or hit Cmd+E. Click the render to edit in MathLive.
Quiz that simplifies first.CortexJS compares expressions, not strings. Override when the engine is wrong.
Paid gates you can see.Drawing and quiz are Sigma. Free still studies every card you already made.