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Rasyn

YC S26

San Francisco, US · Founded 2017 · 3 employees · 11 known investors

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Rasyn.ai offers Marigold, an AI research assistant that lets scientists ask research questions, run tools, or delegate entire tasks, returning results such as structures, charts, code, and papers in panels. It provides 54 runnable tools, 40 executing on connected hardware and 14 on hosted endpoints.

AI & Machine LearningBiotechDeep TechHealthtechSaaSArtificial IntelligenceDeep LearningManufacturingUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S26)

Rasyn was founded in 2017 by Ayush Chauhan, Daood Hashmi, and Ansh Tiwari.

ACAyush Chauhan
Ayush ChauhanFounderFounder and CTO of Rasyn (S26), which builds Marigold, an AI research assistant that lets scientists ask research questions, run tools, and delegate tasks, returning outputs like structures, charts, code, and papers.
DHDaood Hashmi
Daood HashmiFounderFounder of Rasyn, which builds Marigold, an AI research assistant for scientists. He is a researcher in the Arnold and Marcus Lab at Caltech developing diffusion models to predict organic reaction mechanisms and propose synthetic pathways, previously worked on DFT and molecular dynamics simulations in the Goddard Lab, and studied chemical engineering at Caltech.
AT
Ansh TiwariFounder/CEO

Investors · 11

Array Ventures Management LlcreportedSan Francisco · $1.5M

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Caladanreported

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Capitalize VCreportedChicago · $100K – $200K

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CharacterreportedMilwaukee · $2M

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General Advancereported

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Inflection Point VenturesreportedGurgaon

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MyAsiaVCreportedSeattle

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Neer Venture Partnersreported$100K – $500K

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Telescope PartnersreportedSan Francisco

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Undeterred CapitalreportedLos Angeles · $500K – $1M

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Related companies · 5

CerrionCerrion develops AI solutions for the manufacturing industry to improve efficiency, safety, and resilience in production operations.
OverviewOverview AI builds AI-powered vision systems that detect manufacturing defects in real-time across production lines, learning and adapting to any product within hours. The system serves manufacturers across automotive, pharmaceutical, and other high-volume production industries globally.
Ligo BiosciencesLigo develops computational tools for enzyme design by combining large language models with specialized neural networks to enable scientists and AI agents to discover new enzymes and biological functions.
AnthrogenAnthrogen develops Odyssey, a family of protein language models with 102 billion parameters designed for multi-objective protein design. The models provide an API for researchers and organizations in biotechnology and drug discovery.
Numerion LabsNumerion combines drug discovery expertise with machine learning and computational chemistry. The company applies AI to drug development.

Companies working in the same space as Rasyn.

In the news

Rasyn: One place to run any Chemistry taskycombinator.com · Aug 2026

Frequently asked questions

What does Rasyn do?
Rasyn.ai offers Marigold, an AI research assistant that lets scientists ask research questions, run tools, or delegate entire tasks, returning results such as structures, charts, code, and papers in panels. It provides 54 runnable tools, 40 executing on connected hardware and 14 on hosted endpoints.
Who founded Rasyn?
Rasyn was founded by Ayush Chauhan, Daood Hashmi, Ansh Tiwari in 2017.
Who are Rasyn's investors?
Rasyn's investors include Y Combinator, Array Ventures Management Llc, Caladan, Capitalize VC, Character, General Advance, Inflection Point Ventures, MyAsiaVC and 3 more.
Where is Rasyn headquartered?
Rasyn is headquartered in San Francisco, US.