Cluster hundreds of keywords into topic groups with pure PHP — no API cost. Free tool for content mapping.
How does clustering work?
Keywords sharing 2+ meaningful words (or 34%+ token overlap) land in the same cluster, sorted biggest-first.
Does it use AI or paid APIs?
No — pure PHP string similarity, so it is free and unlimited.
What do I do with clusters?
Turn each cluster into one article (keywords as H2s) or one category page to avoid keyword cannibalization.
