HarnessRouter

Active · The world's first unified interface for agent harnesses.

YC S23

Website YC profile

Why it ranks

How the rank works

7signal of 100 · rising 2

went through YCProgram · this site+4
team of 3Team size · YC's directory+3.1

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

Competitors

RunAnywhereShared: deepseek harness, claude code, infrastructureYC W26San FranciscoStartup →AI

HilstartShared: agent harnessesYC S26San FranciscoStartup →AI

MultiplierShared: agent harnessesYC X26New York CityStartup →Developer toolsInactive

VesselShared: unified interface, handle, apiYC W22San FranciscoStartup →AI

EndstackShared: unified interface, agent, fileYC F24Los AngelesStartup →

Companies closest to HarnessRouter
Company	Category	Status	Program
RunAnywhereShared: deepseek harness, claude code, infrastructureYC W26ActiveAI, Devtools	AI, Devtools	Active	YCW26
HilstartShared: agent harnessesYC S26ActiveAI, Devtools	AI, Devtools	Active	YCS26
MultiplierShared: agent harnessesYC X26ActiveAI	AI	Active	YCX26
VesselShared: unified interface, handle, apiYC W22InactiveDevtools	Devtools	Inactive	YCW22
EndstackShared: unified interface, agent, fileYC F24ActiveAI, Devtools	AI, Devtools	Active	YCF24

Adjacent

Agent 37Shared: claude code, hermes, sandboxesYC F26New York CityStartup →AI

ArchalShared: infrastructure, sandboxes, agentYC S26San FranciscoStartup →AI

ConiferShared: claude code, harnesses, codexYC S26San FranciscoStartup →AI

VymoShared: unified interface, task, poweredPlug and PlayUnited StatesStartup →AI

Autoresearch, Inc.Shared: infrastructure, harnesses, taskYC S26San FranciscoStartup →

Companies next to HarnessRouter
Company	Category	Status	Program
Agent 37Shared: claude code, hermes, sandboxesYC F26ActiveAI, Devtools	AI, Devtools	Active	YCF26
ArchalShared: infrastructure, sandboxes, agentYC S26ActiveAI, Devtools	AI, Devtools	Active	YCS26
ConiferShared: claude code, harnesses, codexYC S26ActiveAI, Devtools	AI, Devtools	Active	YCS26
VymoShared: unified interface, task, poweredPlug and Play Not statedAI	AI	Not stated	Plug and Play
Autoresearch, Inc.Shared: infrastructure, harnesses, taskYC S26ActiveAI, Devtools	AI, Devtools	Active	YCS26

Also from S23 in AI

All of S23

AutomorphicInfuse knowledge into language models with just 10 samplesYC S23San FranciscoStartup →AI

CedanaFast, reliable, reproducible AI with GPU live migrationYC S23New York CityStartup →AIAcquired

FlowiseAIOpen source GenAI development platformYC S23RemoteStartup →AI

HiroAgents that handle security workYC S23New York CityStartup →AI

Terracotta AIAI-powered Infrastructure as Code PR reviewsYC S23Las VegasStartup →AI

TiptapThe open-source document editor for humans and AI agents.YC S23BerlinStartup →

Company	Category	Status
AutomorphicInfuse knowledge into language models with just 10 samplesteam of 3ActiveAI, Devtools	AI, Devtools	Active
CedanaFast, reliable, reproducible AI with GPU live migrationteam of 5hiringActiveAI, Devtools	AI, Devtools	Active
FlowiseAIOpen source GenAI development platform55.5k starsteam of 5AcquiredAI, Devtools	AI, Devtools	Acquired
HiroAgents that handle security workteam of 2ActiveAI, Devtools	AI, Devtools	Active
Terracotta AIAI-powered Infrastructure as Code PR reviewsteam of 3ActiveAI, Devtools	AI, Devtools	Active
TiptapThe open-source document editor for humans and AI agents.team of 20ActiveAI, Devtools	AI, Devtools	Active

About HarnessRouter

Build agent-powered products without rebuilding the runtime infrastructure. HarnessRouter is the world's first unified interface for agent harnesses, connecting your app to Codex, Claude Code, Hermes, DeepSeek Harness, and other supported harnesses through one API. HarnessRouter Cloud runs tasks in isolated, serverless sandboxes and handles sessions, streaming, files, artifacts, recovery, and execution tracing. Teams can compare harness and model configurations on their own tasks to choose the right balance of quality, latency, and cost. Use the managed Cloud or self-host the Apache 2.0 Community Edition on infrastructure you control. Both implement the Unified Harness Protocol (UHP).

YC batch: S23 · Summer 2023
Status, per YC: Active
Category: AI, Developer tools
Team size: 3
Location: San Francisco, CA, USA
Checked: 6h ago

YC tags: Developer Tools, SaaS, Open Source, Infrastructure, AI