Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

Haystack

Active · Replay real customer journeys against every change before you ship

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 3
  • 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

AIArmatureShared: catch regression, regression before, coding agentYC X26ParisStartup →Developer toolsAcquiredOpticShared: change before, production, catchYC S18New York CityStartup →AIORBO AIShared: customer journeyGoogle AI First India 2025FashionStartup →AIShoelaceShared: customer journey500 Global GA 20CanadaStartup →AIRysticShared: high fidelity, test, agentYC F26San FranciscoStartup →
Companies closest to Haystack
Company
ArmatureShared: catch regression, regression before, coding agentYC X26ActiveAI, Devtools
OpticShared: change before, production, catchYC S18AcquiredDevtools
ORBO AIShared: customer journeyGoogle AI First India 2025Not statedAI
ShoelaceShared: customer journey500 Global GA 20Not statedAI
RysticShared: high fidelity, test, agentYC F26ActiveAI, Devtools

Adjacent

AIVoxOps AIShared: customer journey, case, callYC W24LondonStartup →AIModaShared: production traffic, ship, beforeYC W26San FranciscoStartup →AIVerisShared: high fidelity, before, productionPlug and PlayUnited StatesStartup →AIPointAIShared: customer journeyPlug and PlayUzbekistanStartup →AIRehearsalsShared: real customer, changespeedrun SR004New YorkStartup →
Companies next to Haystack
Company
VoxOps AIShared: customer journey, case, callYC W24ActiveAI
ModaShared: production traffic, ship, beforeYC W26ActiveAI
VerisShared: high fidelity, before, productionPlug and Play Not statedAI
PointAIShared: customer journeyPlug and Play Not statedAI, Data
RehearsalsShared: real customer, changespeedrun SR004 +1Not statedAI

Also from S24 in AI

All of S24
AICodeVizOne living model of your software architectureYC S24San FranciscoStartup →AIPartySecure multiplayer workspace for teams building with agentsYC S24San FranciscoStartup →AIInactivecamferBuilding the world’s first AI mechanical engineer.YC S24San FranciscoStartup →AICloudglueThe video context layer for AI.YC S24San FranciscoStartup →AIcmuxOpen source applied AI lab building next-gen devtoolsYC S24San FranciscoStartup →AIConductorRun a team of coding agents on your MacYC S24San FranciscoStartup →
Company
CodeVizOne living model of your software architectureteam of 2ActiveAI, Devtools
PartySecure multiplayer workspace for teams building with agentsteam of 8ActiveAI, Devtools
camferBuilding the world’s first AI mechanical engineer.team of 4InactiveAI, Devtools
CloudglueThe video context layer for AI.team of 4hiringActiveAI, Devtools
cmuxOpen source applied AI lab building next-gen devtoolsteam of 3hiringActiveAI, Devtools
ConductorRun a team of coding agents on your Macteam of 8ActiveAI, Devtools

Founders

  • Akshay SubramaniamFounder/CEO
  • Jake YatvitskiyFounder/CTO

About Haystack

Haystack automatically learns real customer journeys from production traffic, figures out which ones a code change could affect, and replays them in isolated copies of production to catch regressions before they ship. When something breaks, Haystack shows exactly what changed across the UI, network calls, and events, then gives the failure back to your coding agent to fix and rerun. Teams get high-fidelity QA without having to write or maintain test cases.

YC batch
S24 · Summer 2024
Status, per YC
Active
Category
AI, Developer tools
Team size
2
Location
New York City, NY, USA
Founded
2024
Checked
10h ago

YC tags: Developer Tools, B2B, Productivity, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Haystack in S24: 248 companies, 85% AI

LinkedIn

Haystack: questions

Which YC batch was Haystack in?

Haystack was in Y Combinator's Summer 2024 batch (S24).

Is Haystack still active?

Y Combinator lists Haystack as active.

Who founded Haystack?

Haystack's founders, as listed on its YC page: Akshay Subramaniam (Founder/CEO), Jake Yatvitskiy (Founder/CTO).

Where is Haystack based?

Haystack lists New York City, NY, USA as its location on YC's directory.