ContentGecko Keyword Clustering vs SEO Clusterizer

ContentGecko Keyword Clustering is a web tool that groups keywords by similarity in Google search results. It retrieves the top 10 results for each keyword and builds clusters from URLs shared across those results. Analysis can be localized by country and language, and users can set a minimum SERP overlap; a higher threshold produces tighter clusters. A domain can be added to check its organic rank in the report, and clusters can be exported as CSV for other SEO and content planning tools. The free version handles up to 200 keywords in one operation. Paid service costs €19.90 a month and supports up to 20,000 keywords per operation, with 50,000 keyword credits each month. Paid features add search intent, page type, and marketing funnel labels, plus clustering history and dedicated clustering support. The tool focuses on SERP similarity rather than search volume, which requires a separate keyword research tool. Its stated use cases include organizing keyword research, building content clusters, shaping SEO strategy, and avoiding keyword cannibalization.

SEO Clusterizer groups semantically similar search queries to support website structure and content planning. It provides eight clustering algorithms, including semantic analysis, hierarchical clustering, multilingual stemming, rare-word weighting, and tolerance for spelling variants. Its SERP feature groups keywords by overlap among ranking URLs, with results cached for 14 days. Content Analyzer scores pages across 20 quality factors and creates a content brief. The Force examines Google Top 10 competitor text and identifies missing terms. Inputs can come from Serpstat, Ahrefs, SEMrush, Google Keyword Planner, CSV, TSV, and TXT files. Exports include CSV, JSON, TSV, Markdown, and XLSX; JSON is described for developer and CMS integrations. Basic clustering runs locally in the browser, while premium AI, SERP, and content analysis run on the server and are not used to train models. Free costs nothing, Pro costs $29 a month, and Agency costs $89 a month.