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River
Y Combinator LogoFall 2026
Active
Artificial Intelligence
Productivity
San Francisco

The AI desktop.

AI made software engineers 100x more productive. We're bringing that same transformation to knowledge workers with the AI desktop.
Active Founders
Brian Joseff
Brian Joseff
Twitter account
 
Founder/CEO
Founder at River (YC F26). Previously founder at Bedrock (2020-2023). Neuroscience researcher at Stanford School of Medicine. Founding team at Progressly (acquired by Box). BA Economics from Dartmouth. Semi-pro soccer stint.
Chandler Supple
Chandler Supple
Twitter account
 
Founder/CEO
Co-founder @ River (YC F26). Prev. SWE @ Roboflow (YC S20), Z Fellows, co-founder @ Outwork, UC Berkeley CS dropout
River
River
Founded:2026
Batch:Fall 2026
Team Size:2
Status:
Active
Location:San Francisco
Primary Partner:Pete Koomen
 
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