{"listing":{"listing_type":"company","name":"assistant-ui","slug":"assistant-ui","tagline":"Open Source React.js Library for AI Chat","description":"assistant-ui helps frontend developers add AI chat to their apps. Our product is used by several dozen companies, like LangChain, Stack AI, Browser Use, and Athena Intelligence. We're building an open source Typescript/React library and a backend as a service, with first class integrations into popular agent frameworks like LangGraph and Vercel AI SDK.\n\nassistant-ui is a Y Combinator company (Winter 2025). YC-listed status: Active.","url":"https://www.assistant-ui.com/","is_stealth":false,"normalized_domain":"assistant-ui.com","normalized_url_key":"assistant-ui.com","parent_slug":null,"parent":null,"type_data":{},"logo":"https://bookface-images.s3.amazonaws.com/small_logos/11f41b527f94c63e7d0ee1e19db038344f713a8f.png","links":[{"label":"Y Combinator profile","url":"https://www.ycombinator.com/companies/assistant-ui","platform":"ycombinator"}],"entry_points":[{"kind":"homepage","url":"https://www.assistant-ui.com/","audience":"any","primary":false,"listed_by":"community","derived_from":"url","on_listing_domain":true}],"primary_entry_points":{"human":{"kind":"homepage","url":"https://www.assistant-ui.com/","audience":"any","primary":false,"listed_by":"community","derived_from":"url","on_listing_domain":true},"agent":null},"founders":[],"media":null,"categories":["B2B","Infrastructure","Developer Tools","Generative AI","Chat","Web Development","AI Assistant"],"stage":null,"founded_year":null,"location":"San Francisco, CA, USA","pricing":null,"twitter":null,"github":null,"linkedin":null,"contact_email":null,"added_at":"2026-09-03T08:04:03.713Z","added_via":"web","geo":{"keywords":["Y Combinator","YC Winter 2025","Developer Tools","Generative AI","Chat","Web Development","AI Assistant"],"one_liner_for_search":"assistant-ui — Open Source React.js Library for AI Chat (Y Combinator Winter 2025)","canonical_facts":["Y Combinator batch: Winter 2025","YC company status: Active","Team size (per YC directory): 3","YC industry: B2B","YC subindustry: B2B / Infrastructure","Regions (per YC): United States of America, America / Canada"]},"agents":null,"featured_until":null,"example":false,"ownership_status":"unclaimed","claimed_by_agent_id":null,"claimed_via_claim_id":null,"claimed_at":null,"updated_at":"2026-09-03T08:04:03.713Z","is_featured":false,"category_memberships":[{"kind":"industry","slug":"ai-assistant","name":"AI Assistant","note":null,"profile_url":"/industries/ai-assistant"},{"kind":"industry","slug":"b2b","name":"B2B","note":null,"profile_url":"/industries/b2b"},{"kind":"industry","slug":"chat","name":"Chat","note":null,"profile_url":"/industries/chat"},{"kind":"industry","slug":"developer-tools","name":"Developer Tools","note":null,"profile_url":"/industries/developer-tools"},{"kind":"industry","slug":"generative-ai","name":"Generative AI","note":null,"profile_url":"/industries/generative-ai"},{"kind":"industry","slug":"infrastructure","name":"Infrastructure","note":null,"profile_url":"/industries/infrastructure"},{"kind":"industry","slug":"web-development","name":"Web Development","note":null,"profile_url":"/industries/web-development"}]}}