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14,448 startups · 29 programs

Workers IO

Active · Simulation environments for verifying mission-critical software

WebsiteYC profile

Why it ranks

How the rank works
9signal of 100 · rising 9
  • went through YCProgram · this site+4
  • team of 2Team size · YC's directory+2.5
  • hiringHiring · Titles (titles.fru.dev), YC+2

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

Competitors

AIPanoptiveShared: building simulation, simulation environment, infrastructureYC S25San FranciscoStartup →AIPolymathShared: simulation environment, agentYC W26San FranciscoStartup →AILightwheelShared: simulation environmentPlug and PlayUnited StatesStartup →AIVerisShared: simulation environment, production, scenarioPlug and PlayUnited StatesStartup →AIMillionShared: generate code, coding agent, verifyYC W24San FranciscoStartup →OtherPatronus AIShared: simulation environment, agentStartup →
Companies closest to Workers IO
Company
PanoptiveShared: building simulation, simulation environment, infrastructureYC S25ActiveAI, Devtools
PolymathShared: simulation environment, agentYC W26ActiveAI
LightwheelShared: simulation environmentPlug and Play Not statedAI
VerisShared: simulation environment, production, scenarioPlug and Play Not statedAI
MillionShared: generate code, coding agent, verifyYC W24ActiveAI, Devtools
Patronus AInot in a program hereShared: simulation environment, agentElsewhereOther

Adjacent

OtherPer VicesShared: critical software, mission, complexYC W12TorontoStartup →OtherOne RobotShared: simulation environment, expensiveYC W26San FranciscoStartup →OtherDualityShared: simulation environmentPlug and PlayUnited StatesStartup →AITeneraShared: software before, simulationspeedrun SR007San FranciscoStartup →AIGroundControlShared: critical software, mission, complexYC X25San FranciscoStartup →
Companies next to Workers IO
Company
Per VicesShared: critical software, mission, complexYC W12ActiveOther
One RobotShared: simulation environment, expensiveYC W26ActiveOther
DualityShared: simulation environmentPlug and Play Not statedOther
TeneraShared: software before, simulationspeedrun SR007Not statedAI
GroundControlShared: critical software, mission, complexYC X25ActiveAI

Also from F26 in AI

All of F26
AICavemanCaveman cuts what AI agents cost without making them dumber.YC F26AmsterdamStartup →AIHueTest agents in realistic worlds built from production usageYC F26San FranciscoStartup →AIMaritimeThe managed cloud for AI agents.YC F26San FranciscoStartup →AIRightNowCo-designing the fastest intelligenceYC F26San FranciscoStartup →AISimulithicAI users that test your app on every device and browserYC F26San FranciscoStartup →AITiloThe Microsoft of the AI era: the operating system for AI agents.YC F26San FranciscoStartup →
Company
CavemanCaveman cuts what AI agents cost without making them dumber.ActiveAI, Devtools
HueTest agents in realistic worlds built from production usageteam of 2ActiveAI, Devtools
MaritimeThe managed cloud for AI agents.team of 3ActiveAI, Devtools
RightNowCo-designing the fastest intelligenceteam of 2ActiveAI, Devtools
SimulithicAI users that test your app on every device and browserteam of 2ActiveAI, Devtools
TiloThe Microsoft of the AI era: the operating system for AI agents.team of 2ActiveAI, Devtools

Founders

  • Chaitanya ChoudharyFounder/CEO

About Workers IO

Workers IO is building simulation environments to catch failures in mission-critical software before they reach production. We run your entire system through millions of simulated production scenarios to verify its correctness and performance properties. Coding agents can now generate code faster than teams can review it. Meanwhile, software and the infrastructure it runs on keep getting more complex. Tests check a small set of cases in isolation, in environments that are different from production. Some of the most expensive failures only surface when customers encounter them. We run your entire system unmodified and simulate network faults, disk failures, crashes, and clock drift. We build the fault models for you and check your system’s requirements across millions of scenarios. Every failure we find can be perfectly reproduced.

YC batch
F26 · Fall 2026
Status, per YC
Active
Category
AI, Developer tools
Team size
2
Location
San Francisco, CA, USA
Founded
2026
Checked
6h ago

YC tags: Developer Tools, B2B, Infrastructure, AI

Changes seen

TagsOct 15, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Workers IO in F26: 219 companies, 89% AI

LinkedIn

Workers IO: questions

Which YC batch was Workers IO in?

Workers IO was in Y Combinator's Fall 2026 batch (F26).

Is Workers IO still active?

Y Combinator lists Workers IO as active.

Who founded Workers IO?

Workers IO's founders, as listed on its YC page: Chaitanya Choudhary (Founder/CEO).

Where is Workers IO based?

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