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Seonio Keyword Clustering

seonio.com

From $7.50/mo Free plan WebAPIBrowser extension
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Spec score 8.6 #2 of 27 in Keyword Clustering Tools

What it is

Seonio Keyword Clustering turns a seed keyword into a topic cluster based on live Google rankings. It compares keyword pairs by overlap among ranking pages, maps them as a weighted graph, and applies the Louvain algorithm to identify topic groups. Related long-tail variants can be grouped under one page, while encyclopedias, marketplaces, and reference sites are filtered before clustering to reduce false connections. Each cluster can show a primary keyword, combined search volume, and the pages currently ranking for it. Terms that do not fit a cluster are flagged separately with their search volume preserved, and the tool shows the top 10 organic results for each cluster head term. It runs on the web and offers API access. The product page includes 10 free searches per month without a credit card. Paid options listed include Starter at $10 a month, Pro at $20 a month, and Business at $40 a month, with lower monthly rates billed annually. 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.

Spec sheet

What it does
Seonio combines keyword research, website traffic analysis, backlink and URL checks, SERP clustering, scraping, REST API access and MCP access in one SEO service.Read 15 Oct 2026 · seonio.com
Purpose
The product turns a seed keyword into a topic cluster built from live Google rankings.Read 9 Oct 2026 · seonio.com
Security
Seonio says it uses technical and organizational measures designed to protect personal information, while noting that absolute security cannot be guaranteed.Read 9 Oct 2026 · seonio.com
Support
Official support is provided by email at [email protected] for account, billing and product questions.Read 15 Oct 2026 · seonio.com
License
The Terms govern use of the hosted website, reports, API and documentation; they prohibit reselling API access or raw outputs and do not publish an open-source licence.Read 15 Oct 2026 · seonio.com
API authentication
API calls use POST requests with JSON bodies and an X-API-Key header, with keys available under account Settings.Read 15 Oct 2026 · seonio.com
API availability
Seonio publishes a REST API with 22 read-only endpoints covering keywords, SERPs, traffic, rankings, authority and backlinks.Read 15 Oct 2026 · seonio.com
API documentation
Each endpoint has request and response fields, examples and an interactive playground for testing calls.Read 15 Oct 2026 · seonio.com
Cluster outputs
Each cluster can include a primary keyword, combined search volume, and the specific pages currently ranking for it.Read 9 Oct 2026 · seonio.com
Clustering algorithm
It maps keywords as a weighted graph and uses the Louvain algorithm to identify topic groups.Read 9 Oct 2026 · seonio.com
Clustering API price
The documented keywords/clustering endpoint costs $0.250 per request and groups a seed keyword's topics by shared search results.Read 15 Oct 2026 · seonio.com
Clustering basis
Keyword Clustering groups terms by overlap among live Google ranking pages instead of matching words or relying only on keyword lists.Read 15 Oct 2026 · seonio.com
Company founded
LinkedIn lists Foundea GmbH as founded in 2016, headquartered in Ulm, Baden-Württemberg, with 2–10 employees.Read 15 Oct 2026 · linkedin.com
Company headquarters
The official legal notice gives Foundea GmbH's address as Lise-Meitner-Str. 9, 89081 Ulm, Germany.Read 15 Oct 2026 · seonio.com
Company legal entity
Seonio.com is provided by Foundea GmbH, represented by Mahir Yildirim, with commercial register HRB 731876 in Ulm, Germany.Read 15 Oct 2026 · seonio.com
Competing pages
The tool shows the top 10 organic results for each cluster head term.Read 9 Oct 2026 · seonio.com
Competitive output
The tool shows the top ten organic results for a cluster head term to expose competitor pages and content formats.Read 15 Oct 2026 · seonio.com
Country coverage
The keyword database currently lists 50 markets, including the United States, United Kingdom, Germany, France, India, Brazil and Japan.Read 15 Oct 2026 · seonio.com
Credit limits
Unused credits do not roll over, and credits refresh at the start of each billing month.Read 9 Oct 2026 · seonio.com
Data processors
The privacy notice identifies Stripe for payment processing, Google for authentication or APIs, and Cloudflare for bot and DDoS protection.Read 15 Oct 2026 · seonio.com
False-connection filter
The product says it removes encyclopedias, marketplaces and reference domains before clustering to reduce misleading topic connections.Read 15 Oct 2026 · seonio.com
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.Read 15 Oct 2026 · seonio.com
Free usage
The product page offers 10 free searches per month with no credit card required.Read 9 Oct 2026 · seonio.com
Independent listing platforms
GetApp lists web, Android and iPhone/iPad deployment and email/help-desk, FAQ/forum and documentation support, but shows no user ratings.Read 15 Oct 2026 · getapp.com
Limit: data reliability
The Terms warn that SEO metrics, rankings, traffic, backlinks, SERPs and clustering outputs may be incomplete, delayed, approximate, unavailable or inaccurate.Read 15 Oct 2026 · seonio.com
Limit: exhausted balance
When included usage is exhausted, data actions pause until the next refresh or until an active subscriber adds Extra Usage.Read 15 Oct 2026 · seonio.com
Limit: G2 evidence
G2 says Seonio has not been reviewed yet and that there are insufficient reviews to provide buying insight.Read 15 Oct 2026 · g2.com
Limit: rate limit
The Terms state a 20-data-request-per-second account limit across website, REST API and MCP actions, with excess requests potentially rejected as HTTP 429.Read 15 Oct 2026 · seonio.com
Long-tail grouping
Overlapping long-tail variants can be consolidated under one page rather than split into separate articles.Read 15 Oct 2026 · seonio.com
Louvain algorithm
The clustering engine maps keywords as a weighted network and applies the Louvain algorithm to find dense topic communities.Read 15 Oct 2026 · seonio.com
MCP clients
Seonio documents OAuth connections for ChatGPT, Claude, Cursor, Claude Code and Codex, plus bearer API-key access for scripts.Read 15 Oct 2026 · seonio.com
MCP integration
The hosted MCP server exposes 23 SEO tools, including keywords_clustering, and uses the same balance and prices as the REST API.Read 15 Oct 2026 · seonio.com
Noise filtering
It removes domains such as encyclopedias, marketplaces, and reference sites before clustering to reduce false connections.Read 9 Oct 2026 · seonio.com
Notable news: API
Seonio announced its SEO API for keyword, traffic, ranking and authority data on June 4, 2026, with the page updated October 10, 2026.Read 15 Oct 2026 · seonio.com
Notable news: launch
Seonio's blog records its launch announcement on June 16, 2025.Read 15 Oct 2026 · seonio.com
Praise: G2 product description
G2 describes the service as a flexible pay-as-you-go SEO tool with a credit system and unused credits that do not expire.Read 15 Oct 2026 · g2.com
Primary keyword
Each cluster receives a primary keyword selected using weighted SERP overlap rather than simply choosing the highest-volume term.Read 15 Oct 2026 · seonio.com
Provider
Seonio.com is provided by Foundea GmbH, located in Ulm, Germany.Read 9 Oct 2026 · seonio.com
Ranking-page output
Results identify specific pages ranking for at least two keywords in a cluster, rather than only listing domains.Read 15 Oct 2026 · seonio.com
Rating on Capterra
0.0 out of 5 from 0 reviewsRead 15 Oct 2026 · capterra.com
Rating on G2
0 out of 5 from 0 reviewsRead 15 Oct 2026 · g2.com
Rating on GetApp
0 out of 5 from 0 reviewsRead 15 Oct 2026 · getapp.com
Rating on SaaSHub
0 out of 5 from 0 reviewsRead 15 Oct 2026 · saashub.com
Report access
Reports remain active for 7 or 30 days depending on the tool, and revisits during that window do not cost another credit.Read 9 Oct 2026 · seonio.com
Security statement
The privacy notice says Seonio uses organizational and technical safeguards but does not guarantee that transmissions or storage can be completely secure.Read 15 Oct 2026 · seonio.com
Seed workflow
A seed term triggers retrieval of Google top-10 results and related keywords, after which Seonio builds a weighted graph and generates topic groups.Read 15 Oct 2026 · seonio.com
Self-hosting
The published product, API and MCP materials describe hosted Seonio endpoints and do not provide a self-hosted deployment package.Read 15 Oct 2026 · seonio.com
SERP overlap
It compares keyword pairs using overlap among Google ranking pages.Read 9 Oct 2026 · seonio.com
SERP overlap scoring
Keyword pairs are linked according to the overlap of their ranking URLs, with minimum overlap and cluster-size thresholds intended to filter weak links.Read 15 Oct 2026 · seonio.com
Topic demand
Clusters report combined search volume across their constituent keywords.Read 15 Oct 2026 · seonio.com
Unmatched keyword handling
Terms that fail the first clustering pass are assigned to the strongest-overlap cluster, while terms that still do not fit are flagged separately.Read 15 Oct 2026 · seonio.com
Unmatched terms
Keywords that do not fit a cluster are flagged separately with their search volume preserved.Read 9 Oct 2026 · seonio.com

Plans and prices

Free Free $ 0 /month 10 credits / month · Free forever · all tools included Read 9 Oct 2026 · seonio.com
Starter $10 a month $ 10 /month 1,000 credits / month · all tools included Read 9 Oct 2026 · seonio.com
Starter $15 a month $15 monthly or $120 yearly All website tools · REST API and MCP · 10 API requests/second · $15 included usage each month · extra usage while active Read 15 Oct 2026 · seonio.com
Pro $20 a month $ 20 /month 2,500 credits / month · all tools included Read 9 Oct 2026 · seonio.com
Pro $30 a month $30 monthly or $240 yearly All website tools · REST API and MCP · 15 API requests/second · $37.50 included usage each month · 25% more usage than Starter Read 15 Oct 2026 · seonio.com
Business $40 a month $ 40 /month 6,000 credits / month · all tools included Read 9 Oct 2026 · seonio.com
Business $60 a month $60 monthly or $480 yearly All website tools · REST API and MCP · 20 API requests/second · $90 included usage each month · 50% more usage than Starter Read 15 Oct 2026 · seonio.com
Starter (annual) $90 a year $ 7.5 /month · Billed annually at $90 1,000 credits / month · all tools included Read 9 Oct 2026 · seonio.com
Pro (annual) $180 a year $ 15.0 /month · Billed annually at $180 2,500 credits / month · all tools included Read 9 Oct 2026 · seonio.com
Business (annual) $360 a year $ 30.0 /month · Billed annually at $360 6,000 credits / month · all tools included Read 9 Oct 2026 · seonio.com

Every Seonio Keyword Clustering plan and price →

Strong points and limits

Strong points

  • Groups keywords using live Google rankings.
  • Shows search volume and ranking pages per cluster.
  • Flags unmatched terms while preserving their volume.
  • Includes 10 free searches per month.
  • API access is available.

Limits

  • Unused credits do not roll over.
  • Reports remain active for 7 or 30 days.
  • Paid Starter costs $10 a month.

Who it suits

This tool suits people organizing keyword research around live Google rankings, especially when they need to group related long-tail searches and inspect ranking pages. The free monthly searches can suit limited or occasional use.

Verdict

Seonio Keyword Clustering provides a defined SERP-based workflow, from topic grouping to cluster-level ranking results. Check the monthly credit allowance and report access window against the pace of your research.

Where Specifiction places it

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