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14,448 startups · 29 programs

Cosmic

Active · Cosmic is an AI-powered headless CMS

WebsiteYC profile

Why it ranks

How the rank works
8signal of 100 · rising 1
  • team of 5Team size · YC's directory+4
  • went through YCProgram · this site+4

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

Competitors

Developer toolsAcquiredPayloadShared: headless cms, api, contentYC S22Grand RapidsStartup →Developer toolsInactiveTipeShared: headless cms, content, developerYC W18San FranciscoStartup →Developer toolsDaptaShared: headless cms, content, api500 Global GA 18ColombiaStartup →AIMagic HourShared: rest api, mcp server, imageYC W24San FranciscoStartup →AIManufactShared: mcp server, typescript, sdkYC S25San FranciscoStartup →
Companies closest to Cosmic
Company
PayloadShared: headless cms, api, contentYC S22AcquiredDevtools
TipeShared: headless cms, content, developerYC W18InactiveDevtools
DaptaShared: headless cms, content, api500 Global GA 18Not statedDevtools
Magic HourShared: rest api, mcp server, imageYC W24ActiveAI, Devtools
ManufactShared: mcp server, typescript, sdkYC S25ActiveAI, Devtools

Adjacent

AIHumworkShared: mcp server, claude code, apiYC X26San FranciscoStartup →AIQuomeShared: deploy apps, directly, agentBetaworks AI Camp: Agent SystemsStartup →AIVoidShared: github copilot, cursor, featureYC S24San FranciscoStartup →OtherDivergent PhysicsShared: claude codeAlchemist Class 41San FranciscoStartup →AITailorShared: api, headlessYC S22TokyoStartup →
Companies next to Cosmic
Company
HumworkShared: mcp server, claude code, apiYC X26ActiveAI, Devtools
QuomeShared: deploy apps, directly, agentBetaworks AI Camp: Agent SystemsNot statedAI, Data
VoidShared: github copilot, cursor, featureYC S24ActiveAI, Devtools
Divergent PhysicsShared: claude codeAlchemist Class 41Not statedOther
TailorShared: api, headlessYC S22ActiveAI, Devtools

Also from W19 in AI

All of W19
AIInactiveBasilicaBasilica is an API that embeds high-dimensional data like images and…YC W19San FranciscoStartup →AIGlideGlide turns spreadsheets into beautiful, intelligent apps.YC W19San FranciscoStartup →AI1910Multimodal AI Platform for Modality Agnostic Drug Discovery™YC W19BostonStartup →AIAcquiredAccept.inc (formerly BoardRE)BoardRE is a new type of mortgage company that upgrades any offer…YC W19DenverStartup →AIAccioJobOffline-first tech skilling and placement for IndiaYC W19GurugramStartup →AIAI InsuranceAI Insurance is the platform that runs insurance companiesYC W19New York CityStartup →
Company
BasilicaBasilica is an API that embeds high-dimensional data like images and…team of 2InactiveAI, Devtools
GlideGlide turns spreadsheets into beautiful, intelligent apps.team of 46ActiveAI, Devtools
1910Multimodal AI Platform for Modality Agnostic Drug Discovery™team of 20ActiveAI
Accept.inc (formerly BoardRE)BoardRE is a new type of mortgage company that upgrades any offer…team of 80acquiredAcquiredAI
AccioJobOffline-first tech skilling and placement for Indiateam of 120ActiveAI
AI InsuranceAI Insurance is the platform that runs insurance companiesteam of 16ActiveAI

About Cosmic

Cosmic is an AI-powered headless CMS built for teams that move fast. We combine flexible content infrastructure with AI Agents that live in Slack, write content, build features, fix bugs, and deploy apps autonomously. Developers get a REST API with sub-100ms response times, a TypeScript SDK, CLI, and MCP Server that plugs directly into Cursor, Claude Code, and GitHub Copilot. Content teams get an intuitive dashboard with 20+ metafield types, AI image and video generation, and no migrations ever. Teams use Cosmic because it eliminates the need to build and maintain CMS infrastructure while giving them AI capabilities most platforms haven't shipped yet. Used by teams in 150+ countries, 50M+ API requests per month, 99.9% uptime SLA. Forever free plan. No credit card required.

YC batch
W19 · Winter 2019
Status, per YC
Active
Category
AI, Developer tools
Team size
5
Location
San Francisco, CA, USA; Remote
Checked
7h ago

YC tags: Developer Tools, API

Cosmic in W19: 194 companies, 27% AI

Cosmic: questions

Which YC batch was Cosmic in?

Cosmic was in Y Combinator's Winter 2019 batch (W19).

Is Cosmic still active?

Y Combinator lists Cosmic as active.

Where is Cosmic based?

Cosmic lists San Francisco, CA, USA; Remote as its location on YC's directory.