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14,448 startups · 29 programs

Raycaster

Active · Agentic AI for knowledge work

WebsiteYC profile

Why it ranks

How the rank works
10signal of 100 · rising 5
  • team of 6Team size · YC's directory+4.4
  • went through YCProgram · this site+4
  • hiringHiring · Titles (titles.fru.dev), YC+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AIPaper InstrumentsShared: knowledge workYC X25San FranciscoStartup →AIAutostepShared: knowledge workYC X26San FranciscoStartup →AIRiverShared: knowledge workYC F26San FranciscoStartup →AIHalluminateShared: knowledge work, theseYC S25San FranciscoStartup →AISynthio LabsShared: life science, biotech, agenticYC X25San FranciscoStartup →
Companies closest to Raycaster
Company
Paper InstrumentsShared: knowledge workYC X25ActiveAI
AutostepShared: knowledge workYC X26 +1ActiveAI
RiverShared: knowledge workYC F26ActiveAI
HalluminateShared: knowledge work, theseYC S25 +1ActiveAI
Synthio LabsShared: life science, biotech, agenticYC X25ActiveAI

Adjacent

OtherAmbitus AIShared: knowledge workNeoStartup →AIBramanteShared: life science, biotech, labsYC X25BostonStartup →AIVulcan TechnologiesShared: knowledge workYC S25AustinStartup →AIDataleapShared: knowledge work, agentic, enterpriseYC S24San FranciscoStartup →OtherAcquiredEnzymeShared: life science, medical device, industryYC S17San FranciscoStartup →
Companies next to Raycaster
Company
Ambitus AIShared: knowledge workNeo Not statedOther
BramanteShared: life science, biotech, labsYC X25ActiveAI
Vulcan TechnologiesShared: knowledge workYC S25ActiveAI, Data
DataleapShared: knowledge work, agentic, enterpriseYC S24ActiveAI
EnzymeShared: life science, medical device, industryYC S17AcquiredOther

Also from F24 in AI

All of F24
AIKeyeThe Smartest Private Equity InvestorYC F24New York CityStartup →AILaminarEnterprise systems delivery without the turbulence.YC F24San FranciscoStartup →AIReticularScaling Genomic AI for Embryo SelectionYC F24BostonStartup →AIStructStruct keeps prod runningYC F24San FranciscoStartup →AITinyA new kind of ERP system for factoriesYC F24SingaporeStartup →AIAbundantAgent simulation and RL for researchersYC F24San FranciscoStartup →
Company
KeyeThe Smartest Private Equity Investorteam of 3hiringActiveAI
LaminarEnterprise systems delivery without the turbulence.team of 15hiringActiveAI
ReticularScaling Genomic AI for Embryo Selectionteam of 2ActiveAI
StructStruct keeps prod runningteam of 3ActiveAI, Devtools
TinyA new kind of ERP system for factoriesteam of 3ActiveAI
AbundantAgent simulation and RL for researchersteam of 7hiringActiveAI, Devtools

Founders

  • Levi LianFounder/CEO

About Raycaster

Raycaster began as an agentic AI platform for knowledge work, serving dozens of publicly traded companies across life sciences, medical devices, energy, and oil and gas. It has since launched a division dedicated to training and evaluating AI systems in these industries, working directly with leading AI labs and enterprises to improve their ability to perform economically valuable work.

YC batch
F24 · Fall 2024
Status, per YC
Active
Category
AI, Data
Team size
6
Location
New York City, NY, USA
Founded
2025
Checked
6h ago

YC tags: Biotech, Data Labeling, Enterprise Software, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗
WebsiteSep 25, 2026

Moved its website from raycaster.ai to eval.raycaster.ai.

Source ↗
Team sizeSep 25, 2026

Team went from 3 to 6 people.

Source ↗

Raycaster in F24: 94 companies, 86% AI

GitHub LinkedIn

Raycaster: questions

Which YC batch was Raycaster in?

Raycaster was in Y Combinator's Fall 2024 batch (F24).

Is Raycaster still active?

Y Combinator lists Raycaster as active.

Who founded Raycaster?

Raycaster's founders, as listed on its YC page: Levi Lian (Founder/CEO).

Where is Raycaster based?

Raycaster lists New York City, NY, USA as its location on YC's directory.