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River

YC F26

San Francisco, US · Founded 2026 · 2 employees · 3 known investors

Find your way into River

River is developing an AI-powered desktop environment aimed at increasing the productivity of knowledge workers, applying to general office and information tasks the kind of AI assistance already used in software development.

AI & Machine LearningEnterprise SoftwareFuture of WorkArtificial IntelligenceProductivityUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (F26)

River was founded in 2026 by Brian Joseff and Chandler Supple.

BJBrian Joseff
Brian Joseffin𝕏Founder/CEOHe previously founded Bedrock (2020-2023), worked as a neuroscience researcher at Stanford School of Medicine, and was on the founding team of Progressly (acquired by Box). He holds a BA in Economics from Dartmouth.
CSChandler Supple
Chandler Supplein𝕏Founder/CEOFounder and CEO of River, previously a software engineer at Roboflow and co-founder of Outwork, and a participant in Z Fellows. He studied computer science at UC Berkeley before leaving.

Investors · 3

Y CombinatorSan Francisco · $500K
Claypond CapitalreportedBengaluru
Elev8 Venture PartnersreportedBengaluru

Funding

SEC filings, press & company announcements
  • Undisclosed amountSeries Seed and Series AAug 2026
    Source ↗
  • Undisclosed amountSeries CAug 2026
    Source ↗

Source: company announcements and press reports — follow each round's link for the claim.

In the news

How the name River inspired a $16,000 fundraising run - Bellarine Timestimesnewsgroup.com.au · Sep 2026River Markets Raises $8.5M in Seed Fundingfinsmes.com · Aug 2026River AI Raises $1.1 Billion in Fundingfinsmes.com · Aug 2026River AI raises $1.1B across Series Seed and Series A — Riverriver.ai · Aug 2026River Raises $120M in Series C Fundingfinsmes.com · Aug 2026River Mobility raises $120 mn series C funding led by Elev8 Venture Partners, Claypond Capitalentrepreneur.economictimes.indiatimes.com · Aug 2026The Kissimmee River has been brought back to life, and wildlife is thrivingnationalgeographic.com · Apr 2023

Frequently asked questions

What does River do?
River is developing an AI-powered desktop environment aimed at increasing the productivity of knowledge workers, applying to general office and information tasks the kind of AI assistance already used in software development.
Who founded River?
River was founded by Brian Joseff, Chandler Supple in 2026.
Who are River's investors?
River's investors include Y Combinator, Claypond Capital, Elev8 Venture Partners.
Where is River headquartered?
River is headquartered in San Francisco, US.