Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

Respan

Active · Open-source, extensible AI gateway with observability and evals

WebsiteYC profile

Why it ranks

How the rank works
13signal of 100 · rising 5
  • team of 20Team size · YC's directory+6.9
  • 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

AIExecutorShared: aiops, gateway, openYC S26San FranciscoStartup →AIAcquiredDAGWorks Inc.Shared: aiops, observability, openYC W23San FranciscoStartup →AIEvidently AIShared: resolve issue, open, sourceYC S21LondonStartup →AILuciq (formerly Instabug)Shared: resolve issue, observability, agentYC W16CairoStartup →Developer toolsSentryShared: resolve issue, application, understand500 Global 2015United StatesStartup →
Companies closest to Respan
Company
ExecutorShared: aiops, gateway, openYC S26ActiveAI, Devtools
DAGWorks Inc.Shared: aiops, observability, openYC W23AcquiredAI, Devtools
Evidently AIShared: resolve issue, open, sourceYC S21ActiveAI, Data, Devtools
Luciq (formerly Instabug)Shared: resolve issue, observability, agentYC W16ActiveAI, Devtools
SentryShared: resolve issue, application, understand500 Global 2015Not statedDevtools

Adjacent

AIInactiveNeptune.ioShared: monitoring, aiops, observabilityYC S14San FranciscoStartup →AIFlamecastShared: gateway, agentSPC 2025San FranciscoStartup →AIExperiential LabsShared: gateway, open, sourceYC S26San FranciscoStartup →DataInactiveMonosiShared: extensible, observability, openYC S20San FranciscoStartup →AIEntanglShared: resolve issueYC S24San FranciscoStartup →
Companies next to Respan
Company
Neptune.ioShared: monitoring, aiops, observabilityYC S14InactiveAI, Devtools
FlamecastShared: gateway, agentSPC 2025Not statedAI, Devtools
Experiential LabsShared: gateway, open, sourceYC S26ActiveAI, Devtools
MonosiShared: extensible, observability, openYC S20InactiveData, Devtools
EntanglShared: resolve issueYC S24ActiveAI, Devtools

Also from W24 in AI

All of W24
AIAgentic LabsAI system design tools for dev teamsYC W24New York CityStartup →AICentauri AIHelps teams work effectively with AI coding agents.YC W24San FranciscoStartup →AIDecipher AIQA agents that write tests 10x faster with zero maintenanceYC W24San FranciscoStartup →AIDownlinkMake your LLMs 3x faster.YC W24San FranciscoStartup →AIDragoneyeCustom video detection models in less than 5 minutesYC W24New York CityStartup →AIEllipsisManaged Agent platformYC W24New York CityStartup →
Company
Agentic LabsAI system design tools for dev teamsteam of 2ActiveAI, Devtools
Centauri AIHelps teams work effectively with AI coding agents.team of 5ActiveAI, Devtools
Decipher AIQA agents that write tests 10x faster with zero maintenanceteam of 4ActiveAI, Devtools
DownlinkMake your LLMs 3x faster.ActiveAI, Devtools
DragoneyeCustom video detection models in less than 5 minutesteam of 2ActiveAI, Devtools
EllipsisManaged Agent platformteam of 2hiringActiveAI, Devtools

About Respan

Respan is an open-source AI gateway that helps companies run reliable AI applications at scale. Written in Rust and designed to be extended, it gives developers control over how their applications connect to models and providers. Respan combines the gateway with observability and evaluations so teams can understand agent behavior, resolve issues and improve quality in production. The platform processes over 10T tokens each month and supports more than 6.5M end users.

YC batch
W24 · Winter 2024
Status, per YC
Active
Category
AI, Developer tools
Team size
20
Location
San Francisco, CA, USA
Checked
6h ago

YC tags: AIOps, Developer Tools, SaaS, Monitoring, AI

Changes seen

Team sizeOct 22, 2026

Team went from 23 to 20 people.

Source ↗
One-linerOct 22, 2026

Rewrote its one-liner; it read "Self-driving observability, evals, and gateway for AI agents"

Source ↗

Respan in W24: 248 companies, 84% AI

Respan: questions

Which YC batch was Respan in?

Respan was in Y Combinator's Winter 2024 batch (W24).

Is Respan still active?

Y Combinator lists Respan as active.

Where is Respan based?

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