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Startups14,448Programs29

14,448 startups · 29 programs

idler

Active · Hill-climb any benchmark, for any model, in any domain.

WebsiteYC profile

Why it ranks

How the rank works
12signal of 100 · rising 9
  • team of 12Team size · YC's directory+5.8
  • 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

AIEnactShared: hill climb, reinforcement learning, benchmarkYC S26San FranciscoStartup →AISherpa LabsShared: frontier data, reinforcement learningYC W25San FranciscoStartup →AILitmusShared: hill climb, benchmark, modelYC S26San FranciscoStartup →AIIsidorShared: frontier data, researchSeedcamp 2025Startup →AIOsseusShared: frontier data, research lab, modelYC S26LondonStartup →
Companies closest to idler
Company
EnactShared: hill climb, reinforcement learning, benchmarkYC S26ActiveAI
Sherpa LabsShared: frontier data, reinforcement learningYC W25ActiveAI, Data
LitmusShared: hill climb, benchmark, modelYC S26ActiveAI, Data
IsidorShared: frontier data, researchSeedcamp 2025Not statedAI
OsseusShared: frontier data, research lab, modelYC S26ActiveAI, Data

Adjacent

AIOcular AIShared: data research, research labYC W24San FranciscoStartup →AIEpsilabShared: research lab, reinforcement learning, frontierYC F26San FranciscoStartup →AITokenlessShared: research lab, reinforcement learning, modelYC S26San FranciscoStartup →AISynthetic SciencesShared: research lab, reinforcement learning, evalYC W26San FranciscoStartup →AIRobocurveShared: frontier labs, benchmark, modelYC S26San FranciscoStartup →
Companies next to idler
Company
Ocular AIShared: data research, research labYC W24ActiveAI, Data
EpsilabShared: research lab, reinforcement learning, frontierYC F26ActiveAI, Data
TokenlessShared: research lab, reinforcement learning, modelYC S26ActiveAI, Devtools
Synthetic SciencesShared: research lab, reinforcement learning, evalYC W26ActiveAI, Devtools
RobocurveShared: frontier labs, benchmark, modelYC S26ActiveAI, Devtools

Also from S25 in AI

All of S25
AIMonteSpecialized Models for AgentsYC S25San FranciscoStartup →AIInactiveNuntiusMaking Models Follow Rules.YC S25San FranciscoStartup →AITopologicalPhysics-based foundation models for CAD optimization.YC S25San FranciscoStartup →AIInactiveAcrelyEnterprise Voice AgentsYC S25PittsburghStartup →AIAdaptionalAI-powered insurance claims reviewYC S25San FranciscoStartup →AIAgentMailEmail Inboxes for AI AgentsYC S25San FranciscoStartup →
Company
MonteSpecialized Models for Agentsteam of 2ActiveAI, Devtools
NuntiusMaking Models Follow Rules.team of 2InactiveAI, Devtools
TopologicalPhysics-based foundation models for CAD optimization.team of 2ActiveAI, Devtools
AcrelyEnterprise Voice Agentsteam of 6InactiveAI
AdaptionalAI-powered insurance claims reviewhiringActiveAI
AgentMailEmail Inboxes for AI Agentsteam of 10hiringActiveAI, Devtools

Founders

  • Ivan ChubFounder/CEO
  • Nalu ConcepcionFounder
  • Tony GossFounder

About idler

idler is a frontier data research lab. We build the evals and environments that the world's leading frontier labs use to measure and train their models.

YC batch
S25 · Summer 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
12
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

YC tags: Reinforcement Learning

idler in S25: 166 companies, 92% AI

LinkedIn

idler: questions

Which YC batch was idler in?

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

Is idler still active?

Y Combinator lists idler as active.

Who founded idler?

idler's founders, as listed on its YC page: Ivan Chub (Founder/CEO), Nalu Concepcion (Founder), Tony Goss (Founder).

Where is idler based?

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