Browserbase

Browserbase runs real, isolated Chromium sessions in the cloud (one browser per VM) so agents and scrapers can act on live websites without a team managing headless browser infrastructure themselves. The part that stands out is Stagehand, its open-source browser automation SDK: 25,495 GitHub stars, 1,749 forks, and active daily commits as of 30 September 2026 (github.com/browserbase/stagehand). It ships on npm as @browserbasehq/stagehand with roughly 2 million weekly downloads (npmjs.com/package/@browserbasehq/stagehand). Stagehand v4, released 10 August 2026, moved execution into the browser itself as an extension and the vendor claims 2x the speed and ~80% better token efficiency versus Playwright in its own benchmarks (browserbase.com/changelog/stagehand-v4) — that comparison is Browserbase's own, not an independent benchmark. The company also publishes a genuinely useful changelog with dated, specific entries (browserbase.com/changelog), which most infrastructure vendors don't bother with.

Four tiers as of 1 October 2026 (browserbase.com/pricing): Free ($0, 3 concurrent browsers, 1 browser hour, 7-day data retention, 1,000 Search and 1,000 Fetch calls included), Developer ($20/mo, 25 concurrent browsers, 100 browser hours then $0.12/hr, 30-day retention), Startup ($99/mo, 100 concurrent browsers, 500 browser hours then $0.10/hr, 30-day retention, most-popular badge), and Scale (custom, 250+ concurrent browsers, usage-based, HIPAA BAA and SSO). Overage pricing is granular and stacks: Search API costs $7 per 1,000 calls past the included quota, Fetch costs $1-7 per 1,000 depending on whether proxies or Extract are used, and proxy bandwidth runs $10-12/GB past the included allowance. Auto captcha solving and Stealth Mode are gated behind the paid tiers (Free plan gets neither). Model Gateway access (routing to Anthropic, OpenAI, Gemini through one API key) is pay-as-you-go market price on every tier, including Free (with a $5 token credit).

Browserbase raised a $40M Series B in June 2025 led by Notable Capital, with CRV and Kleiner Perkins participating, at a reported $300M valuation and total funding of $67.5M — announced by the company itself (browserbase.com/blog/series-b-and-beyond) and corroborated independently (builtinsf.com/articles/browserbase-announces-40m-series-b-funding-20250618). Founded by Paul Klein in early 2024, the company is roughly 2.5 years old as of this listing. No later funding round is publicly announced; that Series B remains the most recent one found.

Browserbase documents SOC 2 Type II certification and HIPAA compliance with BAAs available on request, third-party penetration testing, zero-trust browser isolation (one VM per browser, killed and recreated after each session), and configurable data residency across US West, US East, EU (Germany), and Asia (Singapore) — all stated on its own enterprise security docs page (docs.browserbase.com/account/enterprise/security). A hosted Vanta Trust Center exists at trust.browserbase.com, but its compliance document list loads via JavaScript and isn't readable through a plain fetch; the claims above come from Browserbase's documentation, not an independently verified audit report, so treat them as vendor-stated pending direct request of the underlying attestations.

Browserbase publishes named, dated case studies rather than only a logo wall: Commure (healthcare AI, automated insurance claims reconciliation to 20x throughput, published 17 July 2025 at browserbase.com/blog/case-study-commure), Amplitude (sales demo automation, customer since April 2025, published 23 February 2026), Ramp, Airtable, and a joint blog post with Microsoft on evaluating computer-use models (24 November 2025). These are vendor-published customer stories, not independent verification of the results claimed inside them (e.g., Commure's "20x" and Amplitude's "$10M+ influenced pipeline" are self-reported by the customers in Browserbase's own write-ups), but the identities of the customers themselves are corroborated by each company's association with Browserbase being named on both sides.