Browserbase

license

Proprietary(API-only managed browser infra)

source

closed(cloud browser fleet/session infra)

note

companion Stagehand SDK IS open source (Apache/MIT) but the Browserbase service being scored is the closed managed platform

The product scored here is the managed browser-infrastructure service, which is closed and proprietary. The companion Stagehand SDK is open source, but it is a client to the service rather than the service itself, so it does not make the scored platform open.

• https://docs.browserbase.com/ recorded 2026-08-13

  One API key across a hosted Browser API, Search API, Fetch API, Functions and Model Gateway. Stagehand documented as a separate SDK - "The SDK for browser agents. Natural language selectors, self-healing actions, and caching at scale ... Built by Browserbase" - on its own docs site. No self-hosting option for the platform itself.

Browserbase is a hosted service, and Stagehand, the browser agent SDK it maintains, is a separate product that also drives local browsers, so Stagehand's downloads and stars count that SDK rather than use of the service. The vendor's homepage is the evidence that speaks to the service, with a monthly session count and customer and developer totals, naming Ramp, Microsoft and Lovable. Those are the vendor's claims rather than counts made here, and the level is left as it was set.

• https://docs.browserbase.com/ recorded 2026-09-24

  Stagehand listed as a separate SDK: "The SDK for browser agents. Natural language selectors, self-healing actions, and caching at scale. 22k GitHub stars, 700k+ weekly downloads. Built by Browserbase." These figures count the SDK and are not banded.

• https://raw.githubusercontent.com/browserbase/stagehand/main/README.md recorded 2026-09-24

  Stagehand's quickstart launches a local browser, "const browser = await localBrowser.launch({ userDataDir: "./browser-data" })", with "Local runs need Chrome installed", and a later section, "Run it on Browserbase", points the same script at the hosted service. Installing the SDK does not require the service.

• https://www.browserbase.com/ recorded 2026-09-24

  "Browserbase runs 35m+ browser sessions a month across 10,000 customers, including Ramp, Microsoft, and Lovable." A stats row lists Weekly SDK Downloads 800,000, Developers 100,000 and Companies 10,000. The sessions and customer figures are the ones that count the hosted service rather than the SDK.

Browserbase adapts one class of target, the browser, with both credentials and execution handled by the platform. Composio adapts a catalogue of many different systems rather than one, which is what keeps Browserbase a step below it.

• https://docs.browserbase.com/introduction/what-is-browserbase recorded 2026-09-17

  The platform overview: "One API key gives your agent headless browsers, web search, page fetching, functions, model access, and identity", with "Fleets of headless browsers at scale with isolated sessions" and Agent Identity to get "past anti-bot systems, CAPTCHAs, and auth walls".