Overview & positioning
Stagehand is Browserbase's open-source framework for combining natural-language browser instructions with explicit code. Its core primitives cover individual actions with act(), structured data with extract(), page inspection and planning with observe(), and multi-step execution with agent(). The official v3 browser configuration exposes two supported environments: LOCAL, which launches Chrome or Chromium on the developer's machine, and BROWSERBASE, which supplies managed cloud browsers, regions, proxies, stealth features, session persistence, recordings, and production scale. That makes Stagehand a focused automation layer rather than a bundle of every production concern.
Notte is positioned as browser infrastructure for AI agents rather than only an agent loop. The company is an active Y Combinator Summer 2025 startup, and its current platform combines browser sessions, agents, serverless browser functions, credential vaults, authenticated profiles, proxies, CAPTCHA handling, live viewing, replays, file storage, and observability. Notte's site also lists Stagehand among the compatible frameworks that can use its stack, but that interoperability is a Notte platform claim; Stagehand's own current configuration documentation still names only local browsers and Browserbase as first-party environments. The honest comparison is therefore framework versus integrated platform, not two identical SDKs.
Core capabilities
Stagehand v3 was officially launched on October 29, 2025 as a protocol-level rewrite built directly on the Chrome DevTools Protocol. Browserbase reports an average 44.11% speed improvement across its iframe and shadow-root interaction suite; that is a vendor benchmark, but it documents the architectural reason for the change and links the gain to fewer round trips. The current framework adds action caching, self-healing behavior, model-agnostic agent execution, structured extraction, and code-level control around AI decisions. Its active July 2026 release line shows that v3 is not a historical experiment: the client and server packages continue to ship features and fixes.
Notte's strength is the production surface surrounding the agent. Cloud sessions include anti-detection options, residential proxies, CAPTCHA solving, recordings, live viewing, and persistent browser profiles; vaults keep actual credentials away from model prompts; browser functions colocate reusable automation logic with the managed browser runtime. Notte currently advertises agent success above 90% on its own site, a vendor-stated result rather than a third-party measurement. The practical value is broader than that number: a team buys one operational system for identity, browser execution, debugging, deployment, and usage billing instead of integrating each component separately.
Developer experience & workflow
Stagehand gives developers a gradual path from prototype to controlled automation. A local project can run against Chrome or Chromium, mix deterministic code with natural-language instructions, inspect proposed actions, and use the same high-level primitives for repeatable workflows. When managed infrastructure is needed, the documented Browserbase environment adds geographic regions, built-in proxies, persistent contexts, recordings, and higher concurrency. The trade-off is ownership: outside the framework itself, the team still chooses and governs model access, secret storage, proxy strategy, browser operations, monitoring, and deployment unless it adopts Browserbase or another separately integrated service for those concerns.
Notte reduces that assembly work. A developer can start a managed browser, attach a credential vault or authenticated profile, run an agent or deterministic function, watch the live session, and inspect a replay inside one product boundary. Its homepage lists Playwright, Puppeteer, Selenium, browser-use, Stagehand, and CDP-based tooling as compatible, while its hosted service supplies the infrastructure those frameworks do not include by themselves. The trade-off is a larger platform commitment: the public Notte core uses the SSPL-1.0 license, while the hosted vault, profiles, proxy network, compliance controls, and managed execution remain service capabilities tied to Notte's commercial platform.
Pricing & licensing
Stagehand itself is free under the MIT license, so a local evaluation costs only the developer's compute and model usage. Teams that choose the documented Browserbase production path can start on the Free plan with three concurrent browsers and one included browser hour, move to Developer at $20/month with 25 concurrent browsers and 100 included hours, or use Startup at $99/month with 100 concurrent browsers and 500 included hours; Scale is custom. Browserbase charges overages after the included hours on paid plans, so the final cost depends on browser runtime, proxy traffic, model usage, and the newer agent and web-data services a workload consumes.
Notte uses dollar-denominated credits across browser sessions, functions, proxies, and model usage. Free is $0 with $10 of one-time credits; Developer is $20/month with $20 of monthly credits and 25-way browser and function concurrency; Startup is $100/month with $100 of monthly credits and 100-way concurrency; Enterprise is custom. Browser sessions and functions are listed at $0.05/hour, residential proxies at $10/GB, and Notte-managed model calls at provider token price without markup. The hosted platform also maintains a SOC 2 Type II report, which adds procurement value that the Stagehand library alone is not designed to provide.
Ideal use cases / who should pick which
Pick Stagehand when the primary decision is which automation framework should live in the codebase. It is the stronger fit for teams that want an MIT-licensed dependency, local browser development, explicit control over when AI or code acts, structured extraction, and a documented route to Browserbase when managed browsers become necessary. Stagehand is also the preferred standard for developers who already have their own model, secret-management, observability, and deployment choices and do not want a framework decision to automatically become a full-platform purchase.
Pick Notte when the browser operation is the product risk and the team wants to buy a production stack rather than assemble one. Credential-heavy workflows benefit from vault isolation and authenticated profiles; bot-sensitive tasks benefit from managed proxies, CAPTCHA handling, and anti-detection controls; regulated buyers can evaluate the SOC 2 Type II report; small teams can deploy browser functions and inspect replays without operating a separate browser fleet. Notte is the more direct choice when shipping a compliant, observable automation quickly matters more than keeping the framework and infrastructure layers independently selectable.
Verdict
For the buyer defined in this comparison — a developer choosing a durable browser-agent framework to standardize on — Stagehand leads in daily production adoption. Its MIT license, clear act/extract/observe/agent primitives, local Chrome or Chromium workflow, active v3 release line, and documented Browserbase production path make it a low-regret dependency. The framework preserves a meaningful boundary between automation logic and infrastructure: a team can begin locally, keep deterministic code beside AI actions, and adopt managed browsers when scale, stealth, proxying, or session observability becomes a real requirement.