Getting Started With ScreamingCAT: Install, Configure, and Crawl

Tired of slow, bloated SEO crawlers? This guide provides a complete walkthrough of the ScreamingCAT setup, from installation to your first lightning-fast crawl.

Why Another Crawler? Because Speed Matters.

Let’s be direct. The world has enough SEO crawlers. Most are slow, memory-hungry, and locked behind expensive subscriptions. We built ScreamingCAT because we needed a tool that respects our time and our machine’s resources. This guide is your entry point into that world, covering the complete ScreamingCAT setup from start to finish.

Built in Rust, ScreamingCAT is designed for one thing: raw, unadulterated crawling performance. It leverages multi-threading and asynchronous I/O to crawl websites faster than you can brew your morning coffee. There’s no GUI to slow you down, just a powerful command-line interface (CLI) that gives you complete control.

This isn’t a tool for the faint of heart. It’s for technical SEOs, developers, and marketers who are comfortable in the terminal and demand efficiency. If you’re ready to leave bloated UIs behind and embrace performance, you’re in the right place.

Your First ScreamingCAT Setup: Installation

Getting ScreamingCAT onto your machine is refreshingly simple. We’ve avoided complex installers and dependency hell. You have a few straightforward options depending on your operating system and preferences.

For macOS and Linux users with Homebrew, installation is a single command. This is the recommended method as it handles pathing and updates seamlessly. Open your terminal and get ready for the magic.

If you’re a Rust developer or prefer managing packages with Cargo, you can install directly from crates.io. This method compiles the binary on your machine, ensuring you have the latest version tailored for your system architecture. It’s a clean, reliable approach for those in the Rust ecosystem.

Alternatively, you can always grab the pre-compiled binary for your specific OS (Windows, macOS, Linux) directly from our GitHub releases page. Just download the file, unzip it, and place the executable in your system’s PATH. It’s manual, but it works everywhere.

# For macOS or Linux using Homebrew
brew install screamingcat/tap/screamingcat

# Or, using Rust's package manager, Cargo
cargo install screamingcat_seo_crawler

The Configuration File: Your Crawler’s Brain

A proper ScreamingCAT setup hinges on its configuration. Unlike other tools that hide settings behind endless menus and tabs, we use a single, human-readable `config.toml` file. This file is the central nervous system of your crawl, defining everything from the user agent to request timeouts.

When you first run ScreamingCAT, it will generate a default `config.toml` in your home directory. We strongly recommend reviewing this file before running a serious crawl. Our defaults are sensible, but every website is a unique beast that requires a tailored approach.

This file-based configuration is powerful. You can maintain different config files for different projects, check them into version control (like Git), and share them with your team. It ensures consistency and repeatability, which are critical for tracking SEO changes over time. No more guessing what settings a teammate used for last month’s audit.

• User Agent: Specify the user agent string. We default to `ScreamingCAT/VERSION`, but you should change this to identify your crawls or mimic Googlebot.
• Crawl Delay: The number of milliseconds to wait between requests. A crucial setting for being a polite crawler and not overwhelming a server.
• Max Concurrent Requests: The number of simultaneous requests. Higher numbers mean faster crawls but more server load. Adjust based on the target server’s capacity.
• Max Depth: The maximum crawl depth from the start URL. Prevents infinite crawls on sites with broken relative links or parameter traps.
• Respect Robots.txt: A boolean (`true` or `false`) to determine if the crawler obeys the rules in the target’s `robots.txt` file. The default is `true`, and you should have a very good reason to change it.
• Extract Custom Data: Define rules for scraping specific data points using XPath, CSS selectors, or Regex. A topic so important we wrote a separate guide on custom extraction.

Advanced ScreamingCAT Setup: Customizing Your Crawl

With ScreamingCAT installed and configured, it’s time to crawl. The process is initiated from your terminal. The beauty of a CLI tool is its simplicity and scriptability. The most basic command requires just one argument: the starting URL.

Executing `screamingcat –start-url https://example.com` will kick off a crawl of `example.com` using the settings from your default `config.toml`. The crawler will provide real-time feedback in your terminal, showing you the crawl progress, URLs found, and response codes encountered. It’s beautifully verbose.

But the real power lies in overriding your config file with command-line flags. Want to run a quick crawl with a different user agent without editing your file? Easy. `screamingcat –start-url https://example.com –user-agent ‘MyCustomBot/1.0’`. This flexibility makes scripting and ad-hoc analysis incredibly efficient.

Once the crawl is complete, ScreamingCAT will deposit the results into an output directory, typically named after the domain you crawled. Inside, you’ll find a series of CSV files, each containing a different slice of data: one for all URLs, one for images, one for links, and so on. This segmented output is deliberate, making it easy to pipe data into other tools or databases.

Understanding the Output: Turning Data into Insights

A crawl is useless without actionable data. We’ve designed ScreamingCAT’s output to be immediately useful and easily parsable. No proprietary formats, no locked-down databases—just clean, simple CSV files.

The primary output file, `all_urls.csv`, is your treasure map. It contains a row for every URL discovered, with columns for status code, content type, title tag length, meta description, canonical tags, and dozens of other critical SEO data points. This file is the foundation for any complete SEO audit.

From here, you can dive into more specific files. `all_links.csv` details every single `` tag found, including its source, destination, anchor text, and whether it’s a nofollow link. This is invaluable for internal linking analysis and finding broken links. Similarly, `all_images.csv` provides data on image sources, alt text, and file sizes.

The goal is to provide raw, unfiltered data. You can load these CSVs into Google Sheets, a Python script with Pandas, or a database. The choice is yours. We give you the data; you create the insights. For a structured way to approach this analysis, we recommend using our technical SEO audit checklist as a guide.

The best SEO tool doesn’t give you answers. It gives you the right data so you can ask the right questions.

The ScreamingCAT Philosophy

Next Steps: Go Forth and Crawl

You’ve now completed the basic ScreamingCAT setup. You can install the tool, configure it to your liking, run a crawl, and make sense of the output. Frankly, you’re already ahead of 90% of the pack.

But this is just the beginning. The true potential of ScreamingCAT is realized when you start integrating it into your workflows. Automate weekly crawls with cron jobs to monitor for unexpected changes. Use custom extraction to scrape structured data, pricing information, or author names from thousands of pages at once.

We encourage you to explore the command-line flags, experiment with different configuration profiles, and push the tool to its limits. ScreamingCAT is open-source for a reason: we want you to see how it works, contribute your ideas, and help us build the fastest, most efficient SEO crawler on the planet. Now, stop reading and start crawling.