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Cosine

cosine.sh · London, United Kingdom · founded 2022 · team 12 employees (as of 2025) · Y Combinator W23 (Winter 2023), Seed-backed, raised $2.5M · trust 0/4

The Coding Model That Actually Gets It

This dossier was built by Clark from a public scan on 2026-07-04 and is unclaimed. Is this your startup? Claim it.

Verified facts

Company NameCosine
source: https://cosine.sh (homepage)
Product TaglineThe Coding Model That Actually Gets It
source: https://cosine.sh (homepage hero)
City of OperationLondon, United Kingdom
source: https://www.ycombinator.com/companies/cosine
Founding Year2022
source: https://www.ycombinator.com/companies/cosine
Team Size12 employees (as of 2025)
source: https://www.ycombinator.com/companies/cosine
Company StageY Combinator W23 (Winter 2023), Seed-backed, raised $2.5M
source: https://www.ycombinator.com/companies/cosine
FoundersAlistair Pullen (CEO), Yang Li (COO), Sam Stenner
source: https://www.ycombinator.com/companies/cosine, plus web search confirming Sam Stenner
Legal Entity NameBuildt AI Limited (trading as Cosine)
source: https://cosine.sh/legal/privacy
Public Contact Email (on domain)privacy@cosine.sh
source: https://cosine.sh/legal/privacy

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