Clusterscore

Clusterscore takes a single, narrow swing at a problem most SEO tools handle badly: how tightly the pages in a topical cluster actually link to each other. Paste a sitemap, wait thirty seconds, get a score and a fix list. No account, no upload to a third-party server, no recurring crawl.

Who it’s for

Founders, indie operators, and content-led SaaS teams running a blog or knowledge hub on Ghost, WordPress, Webflow, or anything else that exposes a sitemap. If you’ve got content but haven’t thought hard about how it interlinks, this is the cheapest, fastest second opinion you’ll find. The sweet spot is sites with thirty pages or more, enough to form real topic clusters and surface real orphans.

What it actually does well

The differentiator is the measurement model. Most SEO tools count internal links. Clusterscore measures cohesion, how interconnected the pages within a cluster are. A page can have fifty internal links pointing at it and still sit in a structurally weak cluster, and that’s the thing Google rewards or punishes. So the score reflects something real rather than just link volume.

The orphan reporting is cluster-aware too. Instead of just flagging that a page has no inbound links, it tells you which cluster it belongs to, why it’s disconnected, and which sibling pages it should link from or to. That turns the output from a problem list into a fix list, which is where the time savings actually live.

The privacy angle is genuinely unusual. Everything runs in your browser. Your sitemap and crawl data never touch their servers. No signup, no stored history, no third-party processing. Most SEO tools want a permanent account and indefinite data retention, and Clusterscore is one of the few that doesn’t.

Where it gets awkward

It’s a point-in-time tool, so if you want to watch internal linking drift over weeks or months, you’ll outgrow it fast and need something like Sitebulb or Screaming Frog. There’s no dashboard, no historical chart, no alerting.

It’s also single-purpose by design, which is a feature most of the time and a constraint occasionally. It won’t check your Core Web Vitals, your meta tags, your schema, your redirect chains, or anything else outside the internal link graph. If you want one tool that audits everything, this isn’t it, and the team aren’t pretending otherwise.

Small sites get limited value too. Under twenty pages or so and there’s nothing meaningful to cluster, so the score won’t tell you much beyond what eyeballing your nav already would.

How it compares

Versus Ahrefs and Semrush, Clusterscore is narrower and free, with a measurement model neither of the big tools properly offers. You wouldn’t replace either, but you’d run Clusterscore in between as a focused gut-check on cluster health.

Versus Sitebulb and Screaming Frog, Clusterscore is much lighter and quicker. Those tools do far more but want installation, a learning curve, and patience. If internal linking is all you need to think about today, Clusterscore is the faster route.