Napkin Math
YC X26San Francisco, US · Founded 2026 · 3 employees · 1 known investors
An AI-powered food journal application that personalizes nutrition guidance based on individual health goals and lifestyle constraints rather than generic calorie-tracking recommendations.
Also known as Paper Star
Founders & leadership· Y Combinator alumni (X26)
Napkin Math was founded in 2026 by Jynnie Tang, Manuel Castro, and Claire Nord.
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Jynnie Tangin𝕏Co-FounderJynnie Tang previously worked at Retool and One More Multiverse, and studied at MIT. She is now building Napkin Math, an AI-powered food journal application.
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Manuel Castroin𝕏Co-FounderManuel Castro previously worked at Sonos, a healthcare technology company, and Verkada before founding Napkin Math, an AI-powered food journal application.
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Claire Nordin𝕏Co-FounderClaire Nord previously worked on OS security at Apple and as an engineer at Samsara, and holds a degree in Computer Science from MIT (2019). She is currently building Napkin Math, an AI-powered food journal application.
Investors · 1
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Frequently asked questions
- What does Napkin Math do?
- An AI-powered food journal application that personalizes nutrition guidance based on individual health goals and lifestyle constraints rather than generic calorie-tracking recommendations.
- Who founded Napkin Math?
- Napkin Math was founded by Jynnie Tang, Manuel Castro, Claire Nord in 2026.
- Who are Napkin Math's investors?
- Napkin Math's investors include Y Combinator.
- Where is Napkin Math headquartered?
- Napkin Math is headquartered in San Francisco, US.