Key Investor Signals
Selected for Y Combinator's Spring 2026 batch.
Napkin Math joined 's Spring 2026 batch, with Pete Koomen as its primary partner.
Founders bring Apple and Sonos experience, plus a Samsara IPO journey.
Claire Nord was a software engineer at Apple and remained at through its 2021 IPO. Manuel Castro spent four and a half years at before leading product at healthcare platform .
Product already available on iOS and Android
Napkion Math is already available on both the App Store and Google Play.
Other Positive Signals
- Added Apple Health integration, bringing workout data into the food timeline.
- Launched on Product Hunt in June 2026.
Team
Jynnie Tang
CEO & Co-Founder
- Spent three and a half years at One More Multiverse, a Y Combinator W20 tabletop roleplaying platform that reached one million players, rising from game designer to Full Stack Engineer and Product Manager.
- Lead Designer at Magic Circle Studio from 2023 to 2024, designing instant party games backed by a16z Speedrun.
- Frontend Engineer at from 2024 to 2025, a Y Combinator company valued at $3.2 billion.
- Software engineering intern at Samsara in 2019, building coaching workflow features for its driver safety platform.
Manuel Castro
Co-Founder
- Senior Product Manager at Artera from 2021 to 2023, a patient engagement platform used by NYU Langone Health and other hospitals.
- Rose from Senior to Group Product Manager at , the security camera company.
- Shipped more than ten products at Verkada, which passed one million devices deployed worldwide.
- Spent four and a half years at Sonos, the home audio company, ending as Senior Product Manager for Consumer Experience.
Claire Nord
CTO & Co-Founder
- Software Engineer at Apple from 2023 to 2026, building camera privacy protections.
- Software Engineer at Samsara from 2020 to 2023, through the company's IPO in December 2021.
- Interned at Microsoft and built at Synapse Technology, the technology behind photo food logging.
- Earned bachelor's and master's degrees in computer science from MIT, researching at MIT Lincoln Laboratory.
Product
Napkin Math is a mobile food journal that uses photos and AI to make meal tracking easier. It is designed for people who want to understand their eating patterns, symptoms and habits without relying on calorie targets.
Photo-first meal logging
Users can record a meal by taking a photo, with the app separating the food from the background and estimating its nutritional content. Meals can also be logged from a written description.
Patterns across food and wellbeing
The journal builds a record that helps users connect meals with energy, appetite or digestion. Its guidance can adapt to personal routines, health concerns and performance goals.
Private journal with optional sharing
Users choose which meals appear on their public profiles, while notes, AI conversations and meal plans remain private. Streaks and unlockable titles provide additional motivation to keep logging.
Market Overview
Food tracking is already a widespread health behaviour, with 47.4% of US adults reporting that they tried to lose weight during the previous year. Sustained engagement remains the central challenge: weekly food logging falls by 74% between weeks four and twelve.
The global diet and nutrition apps market was valued at $2.14 billion in 2024 and is projected to reach $4.56 billion by 2030. creates another use case beyond weight management, as identifying potential triggers often requires people to record meals and symptoms over time.
Share of adults who reported trying to lose weight during the previous year.
Decrease in weekly logging between weeks four and twelve.
Projected market growth from 2024 to 2030.
Share of the population potentially affected by food intolerance.
Comparable Outcomes
MyFitnessPal
MyFitnessPal built a calorie and nutrition logging app with a large free user base and a paid premium tier. Under Armour acquired MyFitnessPal in February 2015 for $475 million, when the app had roughly 80 million users.
Noom
Noom built a subscription weight-management platform combining an app with human coaching and behavioral psychology, rather than calorie tracking alone. Noom raised approximately $540 million in a Series F led by Silver Lake in May 2021, with Oak HC/FT, Temasek, Novo Holdings, Sequoia, RRE and Samsung Ventures participating. Revenue reached roughly $400 million in 2020, about double the prior year.
MapMyFitness
MapMyFitness built GPS-based apps letting people map, record and share workouts with others, integrating with more than 400 devices and sensors. Under Armour acquired MapMyFitness for $150 million in 2013. At the time the platform had over 20 million registered users, roughly 9 million monthly active users, and about 83 million app installs.
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Sources
This profile was built from public company materials, ecosystem sources, market references, and professional profiles.