$Napkin Math$

Napkin Math YC Application

Spring 2026Active

Napkin Math went through Y Combinator in the Spring 2026 batch as a Consumer company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Spring 2026
Industry: Consumer
Team size: 3
Status: Active
Launched: 2026

Founders

$Manuel Castro$
Manuel CastroFounder
$Claire Nord$
Claire NordFounder
$Jynnie Tang$
Jynnie TangFounder

What Napkin Math does

Existing consumer health apps focus on scaling a one-size-fits-all solution: calorie deficits. But they don’t answer the questions you actually have. Food is deeply personal, and so is Napkin Math: Get the fuel you need for marathon training, while understanding you eat catered office lunches five days a week. Discover what’s triggering your stomach irritation, without sacrificing your weekly dinner with friends. Napkin Math tailors a plan for not only your specific health goal, but also your life.

Napkin Math's YC application, reconstructed

Y Combinator application

Napkin Math, Spring 2026 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Napkin Math

Describe what your company does in 50 characters or less.

The personalized AI food journal that people love to use

What is your company going to make? Please describe your product and what it does or will do.

Napkin Math is an AI-powered food journal tailored to each person's unique health goals and lifestyle. Users get insights that help them understand how food affects them specifically, not just generic calorie counts. It supports marathon training fuel needs, identifies triggers for stomach issues, and adapts to real-life social and work eating habits.

Where do you live now, and where would the company be based after YC?

We live in San Francisco, CA, and the company would remain based here after YC.

Explain your decision regarding location.

San Francisco is where the team lives and where our early users are. It's the center of tech and health innovation, making it the natural place to build and grow Napkin Math.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Napkin Math YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Napkin Math's public data (launch notes, founder backgrounds, product description). It shows how a company like Napkin Math would present itself to YC, not the text they submitted.