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Polymorph

Personalization infra that improves retention, LTV, and CAC

Y CombinatorWinter 2026ActiveB2B

What they do

Problem

Consumer and self-serve apps struggle to build and maintain effective personalization that improves conversion, retention, LTV, and CAC without years of internal ML infrastructure work.

Solution

Polymorph provides developer-facing AI personalization infrastructure to tailor in-app experiences and notifications for each user.

Who it's for

Developers and product teams at consumer and self-serve app companies who need personalization capabilities.

Founders

Andrew Sy
Founder

Building Polymorph previously built Scale AI's ML inference infra (10mil+ calls/day), ex-Meta, Opal

Company timeline

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