Web scraping in Ruby isn’t a “one size fits all” task. If you use a headless browser for a static site, you’re wasting CPU. If you use Nokogiri for a React app, you’ll get zero data.

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A practical guide to choosing the right Ruby web scraping tool based on the target site's characteristics. Uses a decision tree: Nokogiri with the HTTP gem for static HTML pages, Ferrum (Chrome DevTools Protocol) for JavaScript-heavy SPAs instead of Selenium, and Kimurai for high-volume crawling with proxy and multi-threading support. Also covers pro tips including XPath selectors, User-Agent spoofing, streaming data to CSV/JSONL for crash resilience, and ethical scraping practices like respecting robots.txt and adding delays.

The Ultimate Ruby Scraping Stack: From Nokogiri to Ferrum

2. Level 1: The Speed King (HTTP + Nokogiri)

3. Level 2: The Modern Headless Choice (Ferrum)

4. Level 3: High-Volume Orchestration (Kimurai)