Tarantula SEO Spider

The healthiest feature here is the AI keyword layer. Instead of guessing what a page is optimized for, the crawler analyzes the page and reports the keywords it actually targets. It then lists similar and parallel keywords, and you can pull keyword data for any page on any site, not just your own. It turns an audit from a list of errors into a picture of what each page is competing for.

When a page underperforms, you can rewrite it without leaving the tool. The rewriter runs on an in-app AI model, so you select the page, rewrite it and use the result right away. It handles both your own pages and content you crawled from elsewhere, which is how most people use it to refresh old posts that lost their position.

The crawler reports on everything a search engine sees: broken links, redirect chains and loops, duplicate content, duplicate meta information, pages that are unreachable and sitemap entries that point nowhere. It also checks page size, validation errors and mobile usability. Each finding points to a cause, so you are not left guessing why a page will not index.

A separate on-page analyzer takes any single page and runs a deep optimization report you can export as a PDF. Because the report carries your own branding, SEOs commonly use it as a lead magnet or a paid deliverable. It flags overlong titles, thin content and missing meta descriptions, all the problems the crawler surfaces at scale.

The tool generates a full sitemap with the hierarchical structure search engines expect, and it builds a robots.txt policy to match. It also finds pages that your sitemap is missing and folds them into a new one. That closes a gap that many audits leave open, because a page no sitemap lists is a page Google may never crawl.

Tarantula connects to Google PageSpeed and Google Analytics to pull signals that a crawl alone cannot see. You get page speed and ranking data, page-level user and performance metrics, and a view of how pages perform beyond the raw crawl. For teams already living in Analytics, that keeps SEO work tied to what users actually do.

You set the crawl: user agents, crawl depth, whether to process query strings, whether to obey robots.txt, image and asset handling, and the number of concurrent threads. Crawls can run across folders and directories, and a high-speed multi-threaded engine keeps large sites from taking all day. Pause and resume works, even if you come back days later.

You can point the crawler at a competitor's domain and map their site the same way you map your own. It reveals their structure, how deep and wide their content goes, the pages they publish and the keywords they target. Copying a market leader is not the goal, but seeing what they rank on is how you spot the gaps they left open.