Screaming Frog SEO Spider vs SiteOne Crawler

Screaming Frog SEO Spider crawls websites to audit more than 300 SEO issues and support improvements to search performance and user experience. It finds broken links and server errors, checks redirects, and flags page titles and meta descriptions that are missing, duplicated, or too long. For JavaScript-heavy sites, it can render pages with its integrated Chromium WRS, including sites using Angular, React, and Vue.js. Data extraction supports CSS Path, XPath, regular expressions, and custom JavaScript. The crawler connects to Google Analytics, Search Console, and PageSpeed Insights APIs, with link-metrics integrations for Majestic, Ahrefs, and Moz. Crawls can be scheduled, automated from the command line, exported to destinations such as Google Sheets, and compared across runs or between staging and production. The free version costs nothing and allows 500 URLs per crawl; saving crawls, configuration, and advanced features are restricted. The paid version costs $279 a year per licence, with unlimited crawl size subject to allocated memory and storage. It runs on Linux, macOS, and Windows.

SiteOne Crawler is a free website crawler and audit tool that examines SEO, performance, accessibility, security, best practices, and content. It produces an interactive HTML report or text and JSON output, and assigns a quality score from 0.0 to 10.0 across five areas: performance, SEO, security, accessibility, and best practices. It can save a static copy of a website for offline browsing, turn a whole site into Markdown, and generate llms.txt. An optional Chromium mode renders JavaScript-driven pages before crawling. The native Rust binary runs on Windows, macOS, and Linux, with desktop and command-line variants; it has no runtime dependencies. API access and self-hosting are also listed. A CI/CD quality gate offers configurable thresholds, JUnit XML, GitHub annotations, and exit code 10 when checks fail. Reports can be shared through a free service using secure URLs with optional expiration and password protection. The default crawl uses three workers and no more than 10 requests per second combined. Plans are listed at free.