Unbrowse 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.
What is Crawl4AI?
Crawl4AI is an open-source web crawler designed for LLMs and AI agents. It renders pages with a headless browser, then converts the HTML to clean markdown suitable for LLM consumption.
Where Crawl4AI falls short for AI agents
- Still renders full pages — crawling is slow (seconds per page)
- Output is markdown text, not structured data — agents must parse it
- No ability to submit forms, authenticate, or perform write operations
- Scraping-based approach breaks when page layouts change
- No shared knowledge — every user re-crawls the same sites
Head-to-head comparison
| Dimension | Unbrowse | Crawl4AI |
|---|---|---|
| Architecture | API-first: discovers internal APIs, calls them directly | Crawl-first: renders pages, converts HTML to markdown |
| 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 (converted markdown) |
| Setup | curl -fsSL https://unbrowse.ai/install.sh | bash (one command) | pip install crawl4ai + browser binary download |
| Output format | Structured JSON from real API responses | Markdown text extracted from rendered HTML |
| 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. Crawl4AI 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 first-party endpoints from real browsing, maps their schemas and auth, and stores reusable route skills in a shared marketplace. When a fresh route exists, the next call can skip rediscovery and run as a direct HTTP request. When it does not, the browser path stays available and the miss is recorded as a miss.
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 learns first-party routes behind those pages so AI agents can call a known route directly — 3.6x faster on average in the 94-domain paper benchmark.
vs Puppeteer
Puppeteer gives fine-grained Chrome control via CDP, but agents still pay the full rendering cost. Unbrowse tries a known first-party route first, then falls back to the browser when needed.
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 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.
vs Browserbase
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.