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Startups14,448Programs29

14,448 startups · 29 programs

Costream

Active · Indexing human dialogue through digital products

WebsiteYC profile

Why it ranks

How the rank works
9signal of 100 · rising 7
  • team of 8Team size · YC's directory+4.9
  • went through YCProgram · this site+4

A sum of public facts, not a judgement and not investment advice.

Same space

OtherFrydaShared: digital product, throughAntler 2022SwedenStartup →OtherHustleShared: digital productAntler 2021KenyaStartup →OtherSamplerShared: digital product500 Global Distro 1CanadaStartup →OtherXyleneShared: digital product, throughPlug and PlayGermanyStartup →Developer toolsDowsureShared: digital product, throughPlug and PlayChinaStartup →
Companies next to Costream
Company
FrydaShared: digital product, throughAntler 2022Not statedOther
HustleShared: digital productAntler 2021Not statedOther
SamplerShared: digital product500 Global Distro 1Not statedOther
XyleneShared: digital product, throughPlug and Play Not statedOther
DowsureShared: digital product, throughPlug and Play Not statedDevtools

Also from S25

All of S25
AIInactiveAcrelyEnterprise Voice AgentsYC S25PittsburghStartup →AIAdaptionalAI-powered insurance claims reviewYC S25San FranciscoStartup →AIAgentMailEmail Inboxes for AI AgentsYC S25San FranciscoStartup →AIAlaraProcurement Platform for Dental OfficesYC S25Startup →AIAlterPrivileged Access Management for AI AgentsYC S25New York CityStartup →AIAlturVoice AI Agents for Debt CollectionYC S25Mexico CityStartup →
Company
AcrelyEnterprise Voice Agentsteam of 6InactiveAI
AdaptionalAI-powered insurance claims reviewhiringActiveAI
AgentMailEmail Inboxes for AI Agentsteam of 10hiringActiveAI, Devtools
AlaraProcurement Platform for Dental OfficesActiveAI
AlterPrivileged Access Management for AI Agentsteam of 2ActiveAI, Devtools
AlturVoice AI Agents for Debt Collectionteam of 9hiringActiveAI

About Costream

YC batch
S25 · Summer 2025
Status, per YC
Active
Category
Other
Team size
8
Location
San Francisco, CA, USA
Checked
7h ago

Changes seen

HeadquartersOct 5, 2026

Moved its headquarters from Los Angeles, CA, USA to San Francisco, CA, USA.

Source ↗
Team sizeOct 5, 2026

Team went from 7 to 8 people.

Source ↗

Costream in S25: 166 companies, 92% AI

Costream: questions

Which YC batch was Costream in?

Costream was in Y Combinator's Summer 2025 batch (S25).

Is Costream still active?

Y Combinator lists Costream as active.

Where is Costream based?

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