Opennote

The notebook that thinks with you.

·Consumer·YC Summer 2025·tracked since Sep 25, 2026

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Monthly revenue–Not shared yet

Rank–Unranked

Last 30 days–Growth in MRR

Revenue per founder–– founders

About Opennote

Opennote is a notebook with an AI thinking partner built in. Feynman lives in your work: it edits your writing, references your knowledge and the web, runs background tasks, and gives feedback as you work.

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