Screaming Frog SEO Spider vs SEO4Ajax
Screaming Frog SEO Spider
screamingfrog.co.ukSEO4Ajax
seo4ajax.comSide by side
| Figure | Screaming Frog SEO Spider | SEO4Ajax |
|---|---|---|
| Price from | Free | $29/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 9 | 8 |
| Spec score · Technical SEO Software | 8.9 (#2) | 8.0 (#18) |
| Headquarters | Henley-on-Thames, Oxfordshire, UK | Rennes, France |
| Support | Paid users receive technical support, while official self-help includes a user guide, tutorials, FAQ and issue library. | The pricing page lists community support for Developer and email support with 48-hour or 24-hour response times on paid plans. |
| What it does | SEO Spider is a desktop website crawler that audits more than 300 SEO issues. | SEO4Ajax implements dynamic rendering to make AJAX content visible to search engines and social networks. |
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
SEO4Ajax
- Developer PlanFree
- Project Plan$29 a month
- Premium (Project Plan features)$39 a month
- Growth Plan$99 a month
- Premium (Growth Plan features)$132 a month
- Business Plan$199 a month
- Premium (Business Plan features)$265 a month
- Custom PlanPriced on request
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.
SEO4Ajax
SEO4Ajax uses dynamic rendering to make AJAX content visible to search engines and social networks. It can be configured on Apache, nginx, PHP, Java EE, Ruby, Python and Node.js servers, and supports frameworks including React, Vue.js, Angular, AngularJS, GWT, Ember and Backbone. The service says it can handle thousands or millions of pages without website code changes. Its REST API supports customization and automation, while a dashboard tracks bot activity, cache freshness, duplicates and broken links. SEO4Ajax caches snapshots, can capture inner links, and supports custom recache periods and email alerts for quota overages, scraping errors or unreachable websites. SEO reports flag indexing issues such as broken links, duplicates and invalid hreflang tags. The Developer plan is free, with 1,000 pages and 2,500 snapshots per month. Paid plans start at $29/mo (annual), and include email support at listed response times. The service is for business use, not personal, family or household use.