Unbrowse vs Browserbase + Stagehand
Browserbase charges $0.10-$0.12 per browser-hour and Stagehand spins one for every act/extract call. Unbrowse resolves the URL+intent against a cached marketplace endpoint first — and our @unbrowse/stagehand-shim is a one-line drop-in that pays Browserbase only on cache miss.
What is Browserbase?
Browserbase is a managed Chrome runtime for AI agents (Stagehand is their high-level act/extract/observe SDK). Free 1hr/mo → Dev $20/mo for 100hr → Startup $99/mo for 500hr; $0.10-$0.12/browser-hour after included tier; residential proxies $10-$12/GB.
Where Browserbase falls short for AI agents
- Every act/extract/observe spins up a billed browser session even if the data was cacheable
- Browser-hour pricing punishes long-tail and idle sessions
- Proxy bandwidth is charged separately at $10-$12/GB
- Stagehand's vision/DOM loop still calls an LLM per action — token cost compounds
- Self-hosted fallback is real Playwright + your own infra — no marketplace cache
Head-to-head comparison
| Dimension | Unbrowse | Browserbase |
|---|---|---|
| Architecture | API-first: discovers internal APIs, calls them directly | Browser automation: renders full pages via DevTools Protocol |
| Speed (mean) | 950 ms per task (warmed cache)arXiv:2604.00694, 94 domains | 3,404 ms per task (Playwright baseline) |
| Speedup | 3.6x faster (mean), 5.4x faster (median)arXiv:2604.00694 | 1x baseline |
| Cost per task | $0.005 (cached API call)90-96% reduction | $0.53 (browser automation) |
| Token usage | ~200 tokens (structured JSON response)40x reduction | ~8,000 tokens (DOM/HTML per page) |
| Setup | curl -fsSL https://unbrowse.ai/install.sh | bash (one command) | npm install playwright && npx playwright install (~400 MB browsers) |
| Output format | Structured JSON from real API responses | Raw HTML/DOM that agents must parse |
| Shared knowledge | Skill registry: discoveries shared across all agents | None: every user re-discovers the same site patterns |
| Authentication | Auto-injects cookies from real browser profiles | Manual cookie/session management in code |
| Anti-bot resistance | Real API calls with real cookies — indistinguishable from user traffic | Headless fingerprint detection, CAPTCHAs, IP blocking |
Speed and cost data from "Internal APIs Are All You Need" (arXiv:2604.00694) — benchmark across 94 live domains.
How Unbrowse works differently
Every modern website is already powered by internal APIs that return structured JSON before any pixel renders. Browserbase works one layer too high, automating the rendered HTML, parsing DOMs, and clicking buttons that exist for human eyes. That extra translation costs about 8,000 tokens and several seconds on every page, even when the data your agent needs was structured in the first place. Working at the API layer skips the entire detour.
Unbrowse captures those internal endpoints from one real browsing session, maps their schemas and auth, and stores them as reusable skills in a shared marketplace of 600+ domains and 18,000+ endpoints. The next call from any agent skips discovery and runs as a direct HTTP request, returning JSON in roughly 200 tokens instead of 8,000. The shared registry is the difference between every team paying the rendering tax and every team paying it once.
Try Unbrowse now
One command to install. Works with Claude Code, Cursor, Windsurf, and any agent that can call a CLI.
Other comparisons
vs Playwright
Playwright automates browsers with a powerful API, but every action requires rendering a full page. Unbrowse discovers the internal APIs behind those pages so AI agents call them directly — 3.6x faster on average, 40x fewer tokens.
vs Puppeteer
Puppeteer gives fine-grained Chrome control via CDP, but agents still pay the full rendering cost. Unbrowse replaces that with direct API calls — same data, 3.6x faster, 40x fewer tokens, no browser process required.
vs Browser Use
Browser Use connects LLMs to a live browser with vision and action. Unbrowse eliminates the browser entirely — agents call the same APIs websites use internally, cutting cost from $0.53 to $0.005 per task.
vs Crawl4AI
Crawl4AI crawls and converts pages to LLM-friendly markdown. Unbrowse skips the page entirely — it calls the internal APIs behind the content, returning structured JSON instead of scraped text.
vs Firecrawl
Firecrawl charges 1 credit per page scraped. Unbrowse charges $0 on cache hits — and our @unbrowse/firecrawl-shim lets you swap their SDK with one import line, falling back to your existing Firecrawl key only when we miss.