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Seonio Keyword Clustering
What it is
Seonio Keyword Clustering turns a seed keyword into topic groups using live Google rankings. It compares pairs of keywords by the overlap among their ranking pages, then maps terms as a weighted graph and applies the Louvain algorithm to identify clusters. Related long-tail variants with overlapping results can be grouped under one page. Before clustering, the tool removes domains such as encyclopedias, marketplaces, and reference sites to reduce false connections. A cluster can show its primary keyword, combined search volume, and the pages currently ranking for it. Terms that do not fit a group are flagged separately with their search volume preserved. The tool also displays the top 10 organic results for each cluster head term. It runs on the web and provides API access. The product page offers 10 free searches per month without a credit card. Credits refresh at the start of each billing month and unused credits do not roll over. Reports remain active for 7 or 30 days depending on the tool; revisiting one during that period does not use another credit. Paid plans start at $15/mo.
For and against
For
- Clusters use overlap among Google ranking pages
- Shows cluster search volume and ranking pages
- Flags unmatched terms with search volume preserved
- Offers 10 free searches per month
- API access is available
Against
- Unused credits do not roll over
- Reports remain active for 7 or 30 days
- Free searches are limited to 10 per month
The verdict
Seonio Keyword Clustering connects keyword groups to ranking-page overlap and provides cluster-level context. Its free monthly searches offer a way to try the tool, while credit expiry and report windows are worth noting.
Who it suits
This tool suits people organizing keyword research into topic groups based on current Google results. It may be useful when cluster-level search volume and ranking pages matter to planning content.
Plans and prices
Starter
All website tools · REST API and MCP · 10 API requests/second · $15 included usage each month
Read 15 Oct 2026 · seonio.com
Pro
All website tools · REST API and MCP · 15 API requests/second · $37.50 included usage each month
Read 15 Oct 2026 · seonio.com
Business
All website tools · REST API and MCP · 20 API requests/second · $90 included usage each month
Read 15 Oct 2026 · seonio.com
Free
10 credits / month · Free forever · all tools included
Read 9 Oct 2026 · seonio.com
Starter (annual)
1,000 credits / month · all tools included
Read 9 Oct 2026 · seonio.com
Pro (annual)
2,500 credits / month · all tools included
Read 9 Oct 2026 · seonio.com
Business (annual)
6,000 credits / month · all tools included
Read 9 Oct 2026 · seonio.com
On the record
- API authentication
- API calls use POST requests with JSON bodies and an X-API-Key header, with keys available under account Settings.seonio.com · read 15 Oct 2026
- API availability
- Seonio publishes a REST API with 22 read-only endpoints covering keywords, SERPs, traffic, rankings, authority and backlinks.seonio.com · read 15 Oct 2026
- API documentation
- Each endpoint has request and response fields, examples and an interactive playground for testing calls.seonio.com · read 15 Oct 2026
- Clustering algorithm
- It maps keywords as a weighted graph and uses the Louvain algorithm to identify topic groups.seonio.com · read 9 Oct 2026
- Clustering API price
- The documented keywords/clustering endpoint costs $0.250 per request and groups a seed keyword's topics by shared search results.seonio.com · read 15 Oct 2026
- Clustering basis
- Keyword Clustering groups terms by overlap among live Google ranking pages instead of matching words or relying only on keyword lists.seonio.com · read 15 Oct 2026
- Cluster outputs
- Each cluster can include a primary keyword, combined search volume, and the specific pages currently ranking for it.seonio.com · read 9 Oct 2026
- Company founded
- LinkedIn lists Foundea GmbH as founded in 2016, headquartered in Ulm, Baden-Württemberg, with 2–10 employees.linkedin.com · read 15 Oct 2026
- Company headquarters
- The official legal notice gives Foundea GmbH's address as Lise-Meitner-Str. 9, 89081 Ulm, Germany.seonio.com · read 15 Oct 2026
- Company legal entity
- Seonio.com is provided by Foundea GmbH, represented by Mahir Yildirim, with commercial register HRB 731876 in Ulm, Germany.seonio.com · read 15 Oct 2026
- Competing pages
- The tool shows the top 10 organic results for each cluster head term.seonio.com · read 9 Oct 2026
- Competitive output
- The tool shows the top ten organic results for a cluster head term to expose competitor pages and content formats.seonio.com · read 15 Oct 2026
- Country coverage
- The keyword database currently lists 50 markets, including the United States, United Kingdom, Germany, France, India, Brazil and Japan.seonio.com · read 15 Oct 2026
- Credit limits
- Unused credits do not roll over, and credits refresh at the start of each billing month.seonio.com · read 9 Oct 2026
- Data processors
- The privacy notice identifies Stripe for payment processing, Google for authentication or APIs, and Cloudflare for bot and DDoS protection.seonio.com · read 15 Oct 2026
- False-connection filter
- The product says it removes encyclopedias, marketplaces and reference domains before clustering to reduce misleading topic connections.seonio.com · read 15 Oct 2026
- Free access
- The clustering page advertises ten free searches per month without requiring a credit card, while the current home page also offers a one-time $1 testing balance after verification.seonio.com · read 15 Oct 2026
- Free usage
- The product page offers 10 free searches per month with no credit card required.seonio.com · read 9 Oct 2026
