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Comparison

crawler.sh vs Crawl4AI

Python crawler with headless Chrome vs single-binary desktop and CLI with a custom JavaScript engine.

Crawl4AI is a popular open-source Python library for crawling pages and producing Markdown for AI. It is great if Python and Playwright are already your stack. crawler.sh is a single binary with a custom JavaScript engine instead of headless Chrome, plus a desktop app and a CLI that work the same way. Both are aimed at the same use case: clean Markdown from any site, ready for RAG and fine-tuning.

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Side by side

Honest comparison on the axes that decide which tool fits your workflow.

Install
Python package + Playwright + a headless Chrome download. Add it to a virtualenv or container.
One command installs a single binary. Desktop app is a separate one-click download.
Runtime dependencies
Python interpreter and a headless Chrome process per worker.
None at runtime. Static binary.
JavaScript rendering
Headless Chrome via Playwright.
Custom JavaScript engine. Smaller memory footprint and faster cold start than spinning up Chrome.
TLS fingerprint
Chrome via Playwright; varies by setup.
Chrome 131 TLS fingerprint applied by default, shared cookie jar between render path and main crawler.
Markdown output
Yes, core feature. Per-page Markdown returned in Python.
Yes. NDJSON stream during the crawl, or Markdown archive with YAML frontmatter on Pro.
Interfaces
Python API. You write the script.
CLI, desktop app, and MCP server.
robots.txt by default
Configurable; default depends on version.
On by default. Adaptive per-host backoff on 429 and 403, with --ignore-robots to opt out.
Cost
Free and open source. You run it yourself, so you pay for the machine and the headless Chrome workers.
Free up to 1,000 pages per crawl. $99 a year unlocks 10,000 pages and Markdown archive export.
Desktop app
No.
Yes.

Feature notes reflect publicly listed information at the time of writing. Crawl4AI is open source and evolving quickly.

When to pick which

Both tools solve real problems. Pick based on where the work actually runs and what you are billing against.

Pick Crawl4AI when

Python is already your stack, you want full programmatic control inside a Jupyter or pipeline workflow, and you are comfortable running and tuning Playwright with headless Chrome. Crawl4AI is well-maintained and integrates cleanly with Python AI tooling.

Pick crawler.sh when

You want a single binary you can install and run without setting up Python and Playwright, you want a desktop app for non-engineers, or you want a lighter JavaScript engine than headless Chrome with politeness and robots.txt baked in.

Try the local-first path

Install in one command. Crawl any site into clean Markdown in seconds. Free up to 1,000 pages, $99 a year for 10,000.

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Crawler.sh - Free Local AEO & SEO Spider and a Markdown content extractor | Product Hunt