Feyn

ActiveAI-native

Custom models trained on your data

Y Combinator X25

What it does

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.

Its site says now · captured 2026-08-23

Train custom models on your data. Keep learning in production. Run faster and cheaper inference. Own the weights.

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