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14,448 startups · 29 programs

Feyn

Active · Custom models trained on your data

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 5
  • 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

AITraverseShared: custom model, runYC W26San FranciscoStartup →AIGenHealth.aiShared: model trained, case, dataPlug and PlayUnited StatesStartup →AIAgnost AIShared: custom model, train, dataYC S26San FranciscoStartup →AIUnsloth AIShared: custom model, trainingYC S24San FranciscoStartup →AIDialogusShared: actually work, learnYC S26San FranciscoStartup →OtherArcee AIShared: model trainedStartup →OtherGeneral IntuitionShared: model trained, buildingStartup →
Companies closest to Feyn
Company
TraverseShared: custom model, runYC W26ActiveAI
GenHealth.aiShared: model trained, case, dataPlug and Play Not statedAI
Agnost AIShared: custom model, train, dataYC S26 +1ActiveAI, Data, Devtools
Unsloth AIShared: custom model, trainingYC S24ActiveAI, Devtools
DialogusShared: actually work, learnYC S26ActiveAI, Devtools
Arcee AInot in a program hereShared: model trainedElsewhereOther
General Intuitionnot in a program hereShared: model trained, buildingElsewhereOther

Adjacent

AIdari.devShared: custom model, train, runYC F25San FranciscoStartup →AIOumiShared: custom model, case, trainingPlug and PlayUnited StatesStartup →AIVaeroShared: custom model, trainYC W23San FranciscoStartup →AIAutomorphicShared: custom model, improveYC S23San FranciscoStartup →AIArzanaShared: custom model, train, dataYC X26New York CityStartup →
Companies next to Feyn
Company
dari.devShared: custom model, train, runYC F25ActiveAI, Devtools
OumiShared: custom model, case, trainingPlug and Play Not statedAI, Devtools
VaeroShared: custom model, trainYC W23ActiveAI
AutomorphicShared: custom model, improveYC S23ActiveAI, Devtools
ArzanaShared: custom model, train, dataYC X26ActiveAI

Also from X25 in AI

All of X25
AIAttuneFaster builds, zero effort.YC X25San FranciscoStartup →AIAcquiredBlaxelThe infrastructure for autonomous agentsYC X25San FranciscoStartup →AICapacitiveThe data gateway for agents.YC X25San FranciscoStartup →AICartpoleBuilding reinforcement learning environmentsYC X25San FranciscoStartup →AIChironGrammarly for Math ✏️YC X25LondonStartup →AIClideyTurn scattered data into one platform for decision-makingYC X25San FranciscoStartup →
Company
AttuneFaster builds, zero effort.team of 3hiringActiveAI, Devtools
BlaxelThe infrastructure for autonomous agentsteam of 12acquiredAcquiredAI, Devtools
CapacitiveThe data gateway for agents.team of 2ActiveAI, Devtools
CartpoleBuilding reinforcement learning environmentsteam of 2ActiveAI, Data
ChironGrammarly for Math ✏️team of 2ActiveAI, Devtools
ClideyTurn scattered data into one platform for decision-makingteam of 5ActiveAI, Devtools

Founders

  • Shreyash NigamFounder/CEO
  • Bhavnick MinhasFounder/CTO

About Feyn

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.

YC batch
X25 · Spring 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
3
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

YC tags: Developer Tools, AI, ML

Changes seen

TagsOct 19, 2026

No longer tagged Artificial Intelligence.

Source ↗

Feyn in X25: 144 companies, 90% AI

GitHub LinkedIn

Feyn: questions

Which YC batch was Feyn in?

Feyn was in Y Combinator's Spring 2025 batch (X25).

Is Feyn still active?

Y Combinator lists Feyn as active.

Who founded Feyn?

Feyn's founders, as listed on its YC page: Shreyash Nigam (Founder/CEO), Bhavnick Minhas (Founder/CTO).

Where is Feyn based?

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