Opennote (YC S25) — The notebook that thinks with you
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.
Opennote is a Y Combinator company in the Summer 2025 batch. Its directory entry describes it as: The notebook that thinks with you. The founders listed are Rishi Srihari (Founder), Abhi Arya (Founder/CTO), Vedant Vyas (Founder) (Y Combinator directory entry, July 8, 2025).
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Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
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.
opennote-devorganisation linked from the company's own record
The title and description the site itself served, answering 200. Not a cached copy and not the company's directory entry — what was live when we asked.
Counted only where a thread links to this company's own site, announces it by name on that forum, or names it beside its own Y Combinator batch. A thread whose title merely carries the words is not counted — a name is not an identifier. Hacker News is not us, and nothing above is our opinion of the company.
Rishi Srihari
Founder
Co-founder @ Opennote
Abhi Arya
Founder/CTO
Building the AI Infrastructure for Learning
Vedant Vyas
Founder
Co-Founder @ Opennote
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
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What the Full Report on Opennote covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
16 cited sources found
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