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Feyn (YC X25) — Custom models trained on your data

Feyn appears in Y Combinator's company directory in the Spring 2025 batch, listed 2025-03-08. Custom models trained on your data.

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Feyn: Accepted into Y Combinator Spring 2025

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Feyn

New accelerator entry · 2025-03-08 · the record

Spring 2025
batch
3
people
Early
stage
United States of America
region
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In their words

Feyn is an end-to-end service for building custom models from your data. Our models learn how your product actually works, handle the rare cases that are costly to get wrong, and grow sharper the longer they run. Our engineers start by reviewing your current setup and agreeing on what quality means for your workflow. Then we train a model on your data. Once it ships, new cases feed back into training so the model keeps improving. The result is a model that runs faster, improves with use, and is yours to own.

What the record says

BatchSpring 2025
Announced2025-03-08
StageEarly
StatusActive
Team size3
IndustryB2B
Sub-industryB2B -> Engineering, Product and Design
SectorsArtificial Intelligence, Developer Tools, AI, ML
RegionsUnited States of America, America / Canada
BasedSan Francisco, CA, USA
HiringNo
Sitehttps://www.usefeyn.com
Previously known asChonkie

The full profile

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If you're behind Feyn: 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-feyn
Last updated 2026-09-26
Primary record: Y Combinator directory entry
Feyn (YC X25) — Custom models trained on your data. MentionFox, 2026-09-26. https://mentionfox.com/funding/yc-feyn