Screaming Frog SEO Spider vs Seolyzer
Screaming Frog SEO Spider
screamingfrog.co.uk
Seolyzer
seolyzer.ioSide by side
| Figure | Screaming Frog SEO Spider | Seolyzer |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 9 | 0 |
| Spec score · SEO tools | 9.5 (#1) | 7.4 (#184) |
| Spec score · SEO Crawler Software | 8.8 (#2) | 7.1 (#34) |
| API access | Yes | An access token is required for the API, and the maker says to contact them to obtain one; API limits are subject to fair use. |
| Headquarters | Henley-on-Thames, Oxfordshire, UK | 137 Avenue Anatole France, 94600 Choisy-le-Roi, France |
| Intended users | The maker describes the tool as designed for experienced SEOs and says it is trusted by professional SEOs, agencies, and brands for technical SEO audits. | The maker describes Seolyzer as a technical SEO platform made by SEOs for SEOs. |
| Purpose | The SEO Spider is a website crawler that audits sites for over 300 SEO issues to help improve SEO and user experience. | Seolyzer combines technical SEO analysis, site crawling, log analysis and Google Search Console data. |
| Security and privacy | The privacy policy says software use may involve checks of username, licence key, IP address, anonymised machine ID, and timestamp, and that data is stored in secure data centres in the UK and US with access restricted to authorised personnel. | The maker states that data is hosted in France, log personal data is anonymized before storage, and site communications use SSL encryption. |
| Site audit | Yes | Yes |
| Support | Paid users receive technical support, while official self-help includes a user guide, tutorials, FAQ and issue library. | The maker describes support as provided by senior SEOs and offers contact by chat and email. |
Plans
Screaming Frog SEO Spider
- FreeFree
- Paid licencePrice not published
- Free VersionFree
- Free VersionFree
- Paid licence (20+)$235 a year
- Paid licence (10–19)$249 a year
- Paid licence (5–9)$265 a year
- Paid licence (1–4)$279 a year
- Paid Version$279 a year
In their own words
Screaming Frog SEO Spider
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.