Costream

Costream: Indexing human dialogue through digital products

ActiveAI Consumer Products Consumer & Retail Conversational Ai Conversational AI

Website LinkedIn

Updated: Apr 13, 2026 ·

Financial History

Total Raised

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Valuation

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Financial History

Total Raised

N/A

Valuation

N/A

Deep Dive

Sources

ycombinator.com/companies/costream

About

Costream is a Y Combinator-backed company that indexing human dialogue through digital products. Based in San Francisco, USA, the company participated in the Summer 2025 batch of Y Combinator.

The company aims to transform its industry through innovative technology and solutions.

Costream was part of Y Combinator's Summer 2025 cohort, has a team of approximately 2 employees, and is actively operating.

Financial History

Total Raised

N/A

Valuation

N/A

Deep Dive

Sources

ycombinator.com/companies/costream