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Haystack (YC S24) — Replay real customer journeys against every change before you ship

Haystack appears in Y Combinator's company directory in the Summer 2024 batch, listed 2024-07-30. Replay real customer journeys against every change before you ship.

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Haystack: Accepted into Y Combinator Summer 2024

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Haystack

New accelerator entry · 2024-07-30 · the record

Summer 2024
batch
2
people
Early
stage
United States of America
region
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In their words

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.

What the record says

BatchSummer 2024
Announced2024-07-30
StageEarly
StatusActive
Team size2
IndustryB2B
Sub-industryB2B -> Engineering, Product and Design
SectorsArtificial Intelligence, Developer Tools, B2B, Productivity
RegionsUnited States of America, America / Canada
BasedNew York City, NY, USA
HiringNo
Sitehttps://haystack.sh/
Previously known asHaystack Software

The full profile

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If you're behind Haystack: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. FoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.

Sourced from the company's Y Combinator directory entry.

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Permanent URL: https://mentionfox.com/funding/yc-haystackeditor
Last updated 2026-09-26
Primary record: Y Combinator directory entry
Haystack (YC S24) — Replay real customer journeys against every change before you ship. MentionFox, 2026-09-26. https://mentionfox.com/funding/yc-haystackeditor