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14,448 startups · 29 programs

Fulcrum

Active · The agentic debugger for AI systems

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 5
  • went through YCProgram · this site+4
  • team of 2Team size · YC's directory+2.5

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

Competitors

AIRepello AIShared: red teamingEF 2024BangaloreStartup →AIFabraixShared: teaming agent, red teamingYC S26San FranciscoStartup →AISuperagentShared: red teaming, agent, developerYC W24San FranciscoStartup →AIConfident AIShared: red teaming, agent, systemYC W25San FranciscoStartup →
Companies closest to Fulcrum
Company
Repello AIShared: red teamingEF 2024Not statedAI
FabraixShared: teaming agent, red teamingYC S26ActiveAI
SuperagentShared: red teaming, agent, developerYC W24ActiveAI, Devtools
Confident AIShared: red teaming, agent, systemYC W25ActiveAI, Devtools

Adjacent

AIPleomShared: agentic, analyticsYC S25New York CityStartup →AIVoicepanelShared: improve, analyticsYC W24Startup →OtherIndex BiosystemsShared: red teaming, systemPlug and PlayCanadaStartup →AISecuraAIShared: red teamingPlug and PlayUnited StatesStartup →AIAskUIShared: agenticSeedcamp 2023Startup →
Companies next to Fulcrum
Company
PleomShared: agentic, analyticsYC S25ActiveAI, Data
VoicepanelShared: improve, analyticsYC W24ActiveAI, Data
Index BiosystemsShared: red teaming, systemPlug and Play Not statedOther
SecuraAIShared: red teamingPlug and Play +1Not statedAI
AskUIShared: agenticSeedcamp 2023Not statedAI

Also from S25 in AI

All of S25
AIInactiveAcrelyEnterprise Voice AgentsYC S25PittsburghStartup →AIAdaptionalAI-powered insurance claims reviewYC S25San FranciscoStartup →AIAgentMailEmail Inboxes for AI AgentsYC S25San FranciscoStartup →AIAlaraProcurement Platform for Dental OfficesYC S25Startup →AIAlterPrivileged Access Management for AI AgentsYC S25New York CityStartup →AIAlturVoice AI Agents for Debt CollectionYC S25Mexico CityStartup →
Company
AcrelyEnterprise Voice Agentsteam of 6InactiveAI
AdaptionalAI-powered insurance claims reviewhiringActiveAI
AgentMailEmail Inboxes for AI Agentsteam of 10hiringActiveAI, Devtools
AlaraProcurement Platform for Dental OfficesActiveAI
AlterPrivileged Access Management for AI Agentsteam of 2ActiveAI, Devtools
AlturVoice AI Agents for Debt Collectionteam of 9hiringActiveAI

Founders

  • Kaivalya HariharanFounder/CEO
  • Uzay GiritFounder/CTO

About Fulcrum

We build red-teaming agents that help developers fix their RL environments and improve their agents. Our customers are tired of being bullshitted by their agents.

YC batch
S25 · Summer 2025
Status, per YC
Active
Category
AI, Data, Developer tools
Team size
2
Location
San Francisco, CA, USA
Founded
2025
Checked
7h ago

Fulcrum in S25: 166 companies, 92% AI

Fulcrum: questions

Which YC batch was Fulcrum in?

Fulcrum was in Y Combinator's Summer 2025 batch (S25).

Is Fulcrum still active?

Y Combinator lists Fulcrum as active.

Who founded Fulcrum?

Fulcrum's founders, as listed on its YC page: Kaivalya Hariharan (Founder/CEO), Uzay Girit (Founder/CTO).

Where is Fulcrum based?

Fulcrum lists San Francisco, CA, USA as its location on YC's directory.