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The browser runtime and agent SDK for AI — cloud headless browsers plus Stagehand
HQ: San Francisco, CA, United States | Founded: 2024 | Employees: ~60-70 (2026, est.) | Stage: Late Seed / Series B ($300M valuation, June 2025) | Website: https://www.browserbase.com
Browserbase was founded in January 2024 by Paul Klein IV, a three-time founder whose path to browser infrastructure came from painful experience. As an engineer at Twilio during its IPO era, then co-founder of the live-streaming startup StreamClub (acquired by Mux in 2021), he repeatedly had to build headless browser infrastructure himself — it was so hard it was a factor in StreamClub's sale. That experience crystallized into a March 2024 memo, 'An Internet Browser for AI,' arguing that AI agents would need dedicated browser infrastructure, and he launched Browserbase around it.\n\nThe company builds the definitive cloud browser runtime for AI agents and automation: managed, cloud-hosted headless browsers with anti-detection stealth (custom-patched Chromium, `navigator.webdriver=false`),
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