Home / Blog / / 12 Best Keyword Clustering Tools You Need Now

12 Best Keyword Clustering Tools You Need Now

Effective SEO strategies require significant effort across various fronts. One crucial aspect is keyword clustering, a practice that businesses should integrate into their SEO plans.

Google’s improved ability to match pages to specific search intents has made keyword clustering more important than ever. Gone are the days of lengthy mega-guides. Instead, organizing keywords into semantically relevant groups is essential. This practice not only uncovers long-tail keyword opportunities but also prevents keyword cannibalization.

Fortunately, there are several tools available to automate keyword clustering.

In this post, we’ll explore 12 of the most popular keyword clustering tools along with their pros and cons 👇

Number 1: Keyword Insights

Keyword Insights is the first SEO tool that truly helps you optimize for “topical authority.” It stands out as the first dedicated platform designed to make brands leaders in their niche. With Keyword Insights, you can generate thousands of keyword ideas, group them into strategic topic clusters, and seamlessly push them into an AI Writing Assistant to create or optimize content. Leveraging advanced algorithms, it allows users to efficiently group keywords and generate detailed content outlines within minutes.

Within its keyword clustering feature, it boasts:

  • Fastest Clustering: The fastest SERP Based clustering on the market.
  • High Capacity: Ability to cluster up to 2.5 million keywords.
  • Flexible Algorithms: Different clustering algorithms for maximum control.
  • Competitor Visibility Chart: Benchmark competitors for the same topic clusters.
  • Search Intent Filtering: Easily filter keyword clusters by their search intent.
Easily see how your competitor’s clusters compare to yours within Keyword Insights

You can view your results as both an Excel export (which is already nicely formatted into a pivot table) or within the UI itself.

Sample Clustering Report

Keyword Clustering UI

Additionally, Keyword Insights offers a “done for you” option, a bespoke service ensuring top-tier output tailored to your needs. This unique feature sets Keyword Insights apart from other tools in the market.

But Keyword Insights offers more than just a keyword clustering tool. Here’s a closer look at its other features:


Keyword Insights takes a comprehensive approach to content production, ensuring your brand (or your client’s brand) can easily become a topical authority. The platform offers:

  • Keyword Discovery
  • Keyword Clustering
  • Search Intent Analysis
  • Content Briefs
  • AI Writer Assistant

Keyword Insights has also earned several awards and recognitions, including the #1 Product of the Day badge from Product Hunt in 2022 and the G2 Higher Performers badge.

Pricing Plans

Keyword Insights offers a range of pricing plans designed to meet various needs and budgets. 

Here’s a breakdown of the available plans:

Trial Plan ($1 for 4 days)

  • Searches per Month: 6,000
  • Briefs per Month: 40
  • AI Words per Month: 5,000
  • AI Words per Month: 1

Basic Plan ($58/month)

  • Searches per Month: 12,000
  • Briefs per Month: ~900
  • AI Words per Month: 50,000
  • Writer assists per Month: 10

Professional Plan ($145/month)

  • Searches per Month: 36,000
  • Briefs per Month: ~1,800
  • AI Words per Month: 250,000
  • Writer assists per Month: 30

Premium Plan ($299/month)

  • Searches per Month: 100,000
  • Briefs per Month: ~4,500
  • AI Words per Month: 500,000
  • Writer assists per Month: 60

If you opt for an annual payment, you’ll save 20%.

For those who prefer flexibility, there’s a “Pay as you go” option where you can buy as many credits as you need. For Pay as you go users, 1,000 credits cost $7.99. (Monthly subscribers can top up additional credits at a cheaper rate.) Please note that Pay as you go credits can only be used to cluster keywords; you’ll need a subscription plan to access the other features.

Pros and Cons

Fastest SERP based clustering tool on the marketAnalyzing search intent uses credits, but this ensures you only pay for what you need.
The most advanced clustering tool on the market (ability to change algorithms, identify keyword intent and view competitor metrics all within the clustering UI)Writing Assistant isn’t as developed as other writing assistants yet. But it’s being worked on (it’s still in BETA).
Constantly releasing new featuresTakes longer to process cluster data (Due to SERP based clustering)
Bespoke “done for you” option for top-tier output
Live support
Can cluster up to 2.5 million keywords (more than any other clustering tool on the market)
Easily convert keyword clusters into fully written content by integrating clusters into the Writing Assistant.
API available at no additional cost
Cluster visualisation with competitor cluster analysis
Rank checking clusters
Search intent classification on keyword and cluster level
Free Re-clustering option

User Testimonials

The positive experiences of industry professionals highlight the effectiveness and efficiency of Keyword Insights. Here’s what they have to say:

Roan Kellerher, a Digital Strategist, praises Keyword Insights, stating:

“Keyword Insights removes the guesswork out of clustering keywords. I would usually find this process daunting or stressful. The anxiety would come from wondering if I was making the right kind of pages or going after the correct cluster of keywords. With Keyword Insights, I just throw my keywords in and boom I have an answer. Happy days.

Mike Richardson, an SEO Consultant, adds:

“Just given @keywordinsights a go. Special mention to their clustering – think this could be a really, really useful feature for sites looking to expand their content. Can see it doing particularly well for enterprise SEO.”

Here is a video on how to use the Keyword Clustering tool by Keyword Insights 👇

Number 2: Ahrefs Keyword Explorer

Ahrefs is a highly regarded tool in the SEO community, known for its extensive database, powerful keyword research capabilities and backlink database. Since 2010, Ahrefs has been continuously crawling the web, indexing vast amounts of data to provide actionable insights for businesses.

Its Keyword Clustering feature, found within the Keyword Explorer, utilizes Ahrefs’ proprietary “Parent Topic” metric for clustering. This makes it technically the quickest clustering tool on the market, as it delivers instant results. However, it may not be as accurate as SERP-based clustering tools, which scrape live search engine results to group keywords.

Additionally, Ahrefs only allows clustering of up to 10,000 keywords.

Sample Clustering Report

Here is a sample clustering report:

Beyond keyword clustering, Ahrefs offers one of the most comprehensive suites of features available, including:


  • Site Explorer: Analyzes your website’s backlink profile and organic traffic.
  • Keywords Explorer: Provides extensive keyword research, instant clustering, and search intent analysis.
  • Rank Tracker: Monitors your search rankings and compares them with competitors.
  • Site Audit: Checks your site’s health, identifies mobile usability issues, and provides detailed reports on site structure.
  • Content Explorer: Finds popular content on any topic and analyzes social media performance.
  • Backlink Analysis: Offers advanced filters, historical data, and a best links filter for high-quality links.
  • Alerts: Notifies you of new and lost backlinks and brand mentions.
  • Batch Analysis: Analyzes multiple URLs for various SEO metrics.
  • Domain Comparison: Compares up to five domains for backlinks and keywords.
  • Link Intersect: Finds linking opportunities by identifying sites that link to your competitors but not you.
  • Content Gap: Identifies keywords your competitors rank for that you don’t.
  • Page Inspect: Tracks content changes over time with a calendar view.


Ahrefs offers various subscription plans, each tailored to different user needs. You can choose to pay monthly or pay annually and get two months free:

  • Lite Plan: $129/month
    • 5 projects
    • 6 months of history
    • 500 credits per user/month
  • Standard Plan: $249/month
    • 20 projects
    • 2 years of history
    • 750 credits per user/month
    • Includes Portfolios, Content Explorer, Batch Analysis, SERP comparison
  • Advanced Plan: $449/month
    • 50 projects
    • 5 years of history
    • 1,000 credits per user/month
    • Includes Looker Studio integration, Web Explorer, more advanced features in Site Explorer, Site Audit, and Rank Tracker
  • Enterprise Plan: $14,990 annually
    • 100 projects
    • Unlimited history
    • Customized features
    • Includes API access, AI Content Grader, advanced Site Audit and Report Builder features

Pros and Cons:

Extensive SEO tool, offering much more than most other toolsHigher costs may be prohibitive for small businesses
Technically “instant” clustering using parental topicComplexity may require a learning curve
A wealth of amazing guides on their siteNot a “SERP-based” clustering tool. So if you’re after accuracy in your topic clusters, this perhaps isn’t the best tool (for keyword clustering). Ahrefs uses parental topics instead of SERP overlap.
Lovely UXCan only cluster up to 10k keywords
Fast support

Number 3: Key Clusters

Key Clusters is a specialized tool that excels in keyword clustering. Unlike most keyword clustering tools, its credits never expire, providing long-term value. However, it only delivers output in one format: Excel. This can pose a challenge for large projects, as Excel has limitations on the number of rows it can handle before performance issues arise.

Sample Clustering Report

When uploading the varied keywords you want clustered into the tool, they only accept CSV files. Therefore, you need to convert your files first for analysis.

Here is the output of the report in Excel format.

Here are other cool features from Key Clusters:


  • Automated Keyword Grouping: Uses real-time Google SERP data to create topical clusters.
  • Flexible Pricing: Offers PAYG (Pay-As-You-Go) options and discounts on monthly plans.
  • No Expiry on Credits: Purchased credits never expire.
  • No Monthly Subscriptions: Only pay for what you use, making it cost-effective for various project sizes.


Key Clusters offers various pricing plans tailored to different needs, with no monthly subscriptions and credits that never expire:

  • Basic: $9 for 1,000 keywords
  • Starter: $19 for 2,500 keywords
  • Freelancer: $34 for 5,000 keywords
  • Entrepreneur: $59 for 10,000 keywords
  • Consultant: $110 for 20,000 keywords
  • Agency: $129 for 30,000 keywords

Each plan comes with 100 free credits and does not require a credit card to start.

Pros and Cons:

Credits never expireOnly delivers CSV outputs
No monthly subscriptionsLimited features
No live support
No content features
No API available

Number 4: Keyword Cupid

Keyword Cupid is one of the original keyword clustering tools, known for its reliability and established reputation. It allows clustering of up to 80,000 keywords, the second highest capacity after Keyword Insights. Additionally, Keyword Cupid offers a powerful silo structuring feature, making it easy to identify internal linking opportunities between pages.

Sample Clustering Report

They have a section where you can download the report in Excel format. Here is a sample clustering report, downloaded for Excel use.

This is how it looks:

The report includes several tabs such as “All Silos,” “Big Silos,” “Small Silos,” and “Singles.”

The “Singles” tab contains detailed data with various keywords and associated variables like CPC (Cost Per Click), keyword difficulty, volume, and more. The other tabs provide an overview of the different silo sizes without the detailed variables.

This structure provides a comprehensive overview of the clustering results, segmented by different silo sizes and detailed individual keyword analysis.

Here are other key features:

Key Features:

  • Automate and Delegate: Significantly reduce the time spent on keyword research.
  • Accurate Clustering: Advanced neural network models ensure precise keyword clusters.
  • Comprehensive Insights: Provides a holistic content strategy by scraping live data.
  • User-Friendly: Intuitive interface requires no advanced SEO experience.
  • Flexible Pricing: Pay-as-you-go options allow for cost-effective scaling.
  • Speed and Efficiency: Quickly generate detailed reports and interactive mindmaps.

Subscription Packages:

If you’re considering different plans, here’s a breakdown to help you decide:

Starter Plan ($9.99/month)

  • User Accounts: 1
  • Keyword Credits: 500
  • Extra Credits Price: $0.020 per keyword
  • Key Features: Simple Keyword Reports, SERP Spy™, URL Analyzer™, Content Briefs, Neural Network Clustering, up to 2,000 keywords per report, Interactive Mindmap.

Freelancer Plan ($49.99/month)

  • User Accounts: 5
  • Keyword Credits: 5,000
  • Extra Credits Price: $0.010 per keyword
  • Includes: All Starter features, plus up to 20,000 keywords per report, and the ability to analyze up to 3 URLs.

Agency Plan ($149.99/month)

  • User Accounts: 10
  • Keyword Credits: 20,000
  • Extra Credits Price: $0.007 per keyword
  • Includes: All Freelancer features, plus up to 40,000 keywords per report, and the ability to analyze up to 5 URLs.

Enterprise Plan ($499.99/month)

  • User Accounts: 20
  • Keyword Credits: 80,000
  • Extra Credits Price: $0.006 per keyword
  • Includes: All Agency features, plus up to 80,000 keywords per report, and the ability to analyze up to 10 URLs.

Choose the plan that fits your needs based on the number of user accounts, keyword credits, and additional features required for your projects.

*Monthly subscription credits reset at the end of the billing cycle. Extra credits purchased on-demand do not expire.

Customer Testimonials:

Mikula B.:

“It has a slick interface, not clunky like many others, it can use more features but overall good.” (Verified review on Capterra)

Ronell S.:

“This product does what it advertises – clumps keywords into groups based on current SERP analysis of pages ranking for those terms. If three or more pages rank for a given term, it’s put into a keyword group. This saves a ton of manual labor during keyword analysis. Great UI and cheap to use. Highly recommended.” (Verified review on Capterra)

Pros & Cons

Detailed Search: Advanced filters for specific keywordsNew and Complex: Steeper learning curve for beginners
Data Organization: Efficient keyword data managementPotential for Inaccuracy: Data accuracy may vary
Relatively Affordable: Basic plan under $10/month 
Free Trial: 7-day trial period available

Number 5: Surfer SEO

Surfer SEO is an all-in-one SEO tool that leverages topic clustering, a technique that’s essentially synonymous with keyword clustering. Despite the different terminology, the concept remains the same: grouping related keywords and topics to enhance your SEO strategy.

This approach simplifies hours of research by helping you discover dozens of relevant topic clusters based on your primary keyword, proving your expertise and boosting your site’s visibility.

Sample Clustering Report

Here is an example of a topical map after clustering. This is how it will look:

Surfer gives you the following options;

We tested all of the options and they do a good job with Domain map with search console integration.

The other 2 features are underwhelming because they lack flexibility. You cannot choose your own keyword list, (The feature is mentioned as coming soon) and Keyword research feature works by asking for your seed term and automatically building a bunch of clusters using semantic relevance.

Though it was faster than SERP based clustering the output quality was poor. Mainly because you have no control over the data. (No filtering or editing options.)

In addition to topic clustering, Surfer SEO offers several other powerful features to improve your overall SEO performance.


  1. Keyword Research: Identifies high-potential keywords for your niche.
  2. Content Editor: Provides real-time content optimization suggestions.
  3. SERP Analyzer: Analyzes top-performing pages for targeted keywords.
  4. Audit Tool: Evaluates and improves existing content for better rankings.

Plans and Pricing 

  • Essential: $89 per month
    • Optimize up to 30 articles
    • 20 Auto-Optimize runs
    • Humanize 50,000 words
    • Keyword research
    • Invite 2 team members
  • Scale: $129 per month
    • Optimize up to 100 articles
    • 40 Auto-Optimize runs
    • Audit and keyword research
    • Invite 5 team members
  • Scale AI: $219 per month
    • Optimize up to 100 articles
    • Generate up to 10 AI articles
    • 80 Auto-Optimize runs
    • Audit and keyword research
    • Invite 5 team members
    • Onboarding call
  • Enterprise: Custom pricing
    • Custom number of articles and AI articles
    • Personalized onboarding and priority support
    • White label and API options
    • Contact Sales for details

Pros and Cons:

Comprehensive suite of SEO toolsQuery limits can be restrictive
Real-time content optimization guidanceHigher plans may be expensive for some users
Detailed SERP analysis for competitive insightsNo SERP based clustering (NLP based so accuracy is not great)
GSC integration with content auditNo way to upload your keyword list for clustering
Topic Explorer is extremely slowNo cluster competitor analysis
Topic cluster visualisation is unclear and hard to use
Topic Explorer is extremely slow
Poor quality clusters (From our tests)

Number 6. Semrush 

Semrush is a tool designed to help SEO professionals manage and optimize their keyword strategies. It offers comprehensive keyword analysis and clustering features to improve search visibility and content relevance.


  • Keyword Analysis: Provides in-depth metrics on keyword performance.
  • Keyword Clustering: Groups keywords based on relevance and search intent.
  • SERP Tracking: Monitors keyword rankings across search engines.
  • Competitive Analysis: Offers insights into competitor keyword strategies.

Semrush has introduced a new tool called the “Keyword Strategy Builder.” This tool aims to help users drive more traffic to their websites by providing a comprehensive keyword strategy. The Keyword Strategy Builder creates a structured plan that includes both pillar pages and subpages, facilitating an organized and effective approach to content creation and SEO.

Here is how the report would look after pasting an existing keyword list and clustering the list into pillar page and subpage topics.


  • Pro: $129.95 per month
    • For newbies and small teams
    • 5 projects
    • 500 keywords to track
    • 10,000 results per report
    • SEO, PPC, and research tools, including competitor analysis, keyword research, website audit, backlink analysis, and advertising tools
  • Guru: $249.95 per month
    • For agencies and mid-size businesses
    • 15 projects
    • 1,500 keywords to track
    • 30,000 results per report
    • All Pro features plus content marketing toolkit, historical data, multi-location and device tracking, Looker Studio integration
  • Business: Contact for pricing
    • For large agencies and enterprises
    • 40 projects
    • 5,000 keywords to track
    • 50,000 results per report
    • All Guru features plus Share of Voice, extended limits, API access, PLA analytics, free migration from third-party tools.

Pros and Cons:

Ability to rank track keywords in clustersCan be expensive for small businesses
Personal keyword difficulty scoreComplexity may require a learning curve
Integrated with Semrush’s extensive SEO toolsKeyword list is limited to 2000 at a time
CSV exportNo way to adjust SERP overlap settings
Great UI/UXNo free re-clustering
No cluster competitor visualisations
No information on the algorithm or settings (Black box)

Number 7. SE Ranking Keyword Grouper

SE Ranking Keyword Grouper is an intuitive tool designed to simplify the keyword grouping process. It helps users organize keywords into relevant clusters, enhancing content planning and SEO strategies. The tool automatically groups keywords based on their semantic relevance.

Please see a sample clustering report below:

Sample Clustering Report

Other valuable features of SE Ranking include;


  • SERP Analysis: Analyzes search engine results to refine keyword groups.
  • Competitor Analysis: Provides insights into competitors’ keyword strategies.
  • Customizable Reports: Generates detailed reports for tracking keyword performance.

Pricing: SE Ranking offers tiered pricing plans

Essential: $52.00 per month

  • For individual SEO professionals
  • 1 manager seat, 5 projects, 500 keywords to track daily
  • Core SEO tools, historical data (3 months), API access
  • Add-ons: Content Marketing, Local Marketing, Agency Pack

Pro: $95.20 per month

  • For agencies and small teams
  • 3 manager seats, 30 projects, 2,000 keywords to track daily
  • All Essential features plus Looker Studio integration, Keyword Database expansion, Share of Voice metric
  • Add-ons: Content Marketing, Local Marketing, Agency Pack

Business: $207.20 per month

  • For large agencies and enterprises
  • 5 manager seats, unlimited projects, 5,000 keywords to track daily
  • All Pro features plus maximized data reach, Priority Support, Team Training, historical data (all time)
  • Add-ons: Content Marketing, Local Marketing, Agency Pack


  • 20% discount with annual subscription plans

Pros and Cons:

Flexible clustering settings and optionsBasic UI and features
Cost-effective ($0.004 per keyword)No cluster competitor visualisations
CSV export No free re-clustering
No SEO/Content workflow from Clusters
No team sharing projects or workflows.

Number 8. Serpstat

Serpstat is a versatile SEO tool that offers comprehensive keyword research and clustering capabilities. It aims to improve website visibility and content effectiveness through data-driven insights.

Sample Clustering Report

The result of clustering will look like this:

Other features of the tool inlude;


  • Keyword Research: Identifies high-value keywords for your niche.
  • Site Audit: Evaluates website health and SEO performance.
  • Backlink Analysis: Monitors and analyzes backlink profiles.


Serpstat provides several pricing options:

  • Lite Plan: $69/month for individuals and small teams.
  • Standard Plan: $149/month for growing businesses.
  • Advanced Plan: $299/month for established companies.
  • Enterprise Plan: $499/month for large enterprises.

Pros and Cons:

Comprehensive SEO tool with diverse features50,000 keyword limit
Lots of cluster settings and flexibilityBasic UI
No cluster visualisations
No cluster competitor analysis
Domain tracking for top 30 results only
No team sharing projects or workflows.

Number 9. SEO PowerSuite

SEO PowerSuite is a comprehensive SEO tool that features keyword clustering capabilities, offering a tree view of all your keyword groups and subgroups.

Here is the format that the report will take, illustrating how it will appear:

In addition to keyword clustering, it includes other features such as:


SEO PowerSuite includes four main tools:

  • Rank Tracker: Monitor your website’s keyword rankings across various platforms, including SERP ranking, local searches, and YouTube.
  • WebSite Auditor: Analyze your site’s structure, content, and technical issues to improve its health and SEO.
  • Backlinks: Monitor and analyze your backlink profile to ensure strong and effective link building.
  • LinkAssistant: Manage link building and outreach campaigns to enhance your website’s authority.
  • Keywords: Utilize tools for keyword grouping, keyword difficulty checking, and comprehensive keyword analysis. 

Pricing Plans

Free License

  • Cost: Free
  • Keyword Tracking: Unlimited
  • Site Crawling & Auditing: 500 URLs
  • Backlink Tracking: 1,100 links
  • Link Prospecting & Outreach: 1,000 prospects

Professional License

  • Cost: $299/year (regularly $596/year)
  • Keyword Tracking: Unlimited
  • Site Crawling & Auditing: Unlimited
  • Backlink Tracking: Unlimited
  • Link Prospecting & Outreach: Unlimited

Enterprise License

  • Cost: $499/year (regularly $1,396/year)
  • Keyword Tracking: Unlimited
  • Site Crawling & Auditing: Unlimited
  • Backlink Tracking: Unlimited
  • Link Prospecting & Outreach: Unlimited

All plans include tools like Rank Tracker, WebSite Auditor, Backlinks, and LinkAssistant, with features for content optimization, captcha-free checks, scheduled SEO tasks, report printing (with watermarks for Free and Professional), PDF report saving, report scheduling & delivery, and data export in .csv, .sql, and .html formats.

Pros and Cons

Comprehensive suite of SEO tools covering all major aspectsNo SERP based clustering (NLP based so accuracy is not great)
Ability to rank track cluster of keywordsNo cluster visualisations
Provides tree view of topical clusters and sub clustersNo cluster competitor analysis
Ability to schedule tasks and automate reportingNo SEO/Content workflow from Clusters
Flexible pricing plans allowing users to choose based on their needs and budgetExpensive starting at $299 mo
No team sharing projects or workflows.

SEO PowerSuite provides a flexible and powerful set of tools that can cater to various SEO needs, whether for individual use or for managing client projects. The free version offers a substantial amount of functionality, while the Professional and Enterprise plans provide even more features for users who require advanced capabilities.

Number 10. Zenbrief

Zenbrief is an AI writing tool that assists in producing quality content quickly. It researches competitors and uses the same NLP as Google, offering accurate recommendations for improvements. A notable feature is its free keyword clustering tool. By pasting keywords into a text box and running the clustering tool, it generates clear silos and clusters, providing valuable direction for content creation.

Please see a sample clustering report below:

Sample Clustering Report

Zenbrief has several other features which include:


  • Content Brief: The keyword clusters generated by Zenbelief can serve as a starting point for creating content briefs. Each cluster can represent a specific topic or theme for your content.
  • Content Audit: By comparing existing content to the keyword clusters from Zenbelief, you can identify gaps in your content strategy and create new content to target missing keywords.

Pros and Cons

Friendly UINo SERP based clustering (NLP/BERT based so accuracy is not great)
Keyword clustering feature is freeLacks features for outlining detailed content structure.
Assists in identifying content gaps by comparing existing content to keyword clusters.No task assignment, collaborative editing, or SEO analysis.
No cluster competitor analysis.
No SEO/Content workflow from Clusters.
Limited to 30,000 keywords and upload up to 1MB text file.


  • Starter: $79/month for 10 briefs
  • Premium: $195/month for 30 briefs
  • Pro: $295/month for 50 briefs

Number 11. KeySearch

KeySearch is a specialized keyword clustering tool designed to cater to bloggers, SEO professionals, and businesses. With a strong user base of over 10,000 active users, KeySearch focuses on enhancing website visibility and optimizing content for search engines.

The keyword clustering tool in KeySearch allows users to group related keywords efficiently. This feature is essential for refining SEO strategies and facilitating structured content creation, ensuring that your efforts are targeted and effective in boosting search engine rankings.

Sample Clustering Report

Here is an example of a keyword report generated by the keyword clustering tool. The main content topic is dog training, but within this overarching theme, there are numerous related sub-topics that you can explore and cover.

Other KeySearch features include;


  • Daily Searches & Analysis: Perform daily keyword searches and analyses to stay ahead in the SEO game.
  • YouTube Research: Optimize your video content by researching keywords specific to YouTube.
  • Rank Tracker Keywords: Track the performance of your keywords over time.
  • Competitive Analysis Access: Gain insights into your competitors’ strategies and performance.
  • Backlink Checker & Explorer: Monitor and analyze your backlink profile.
  • Site Audit: Evaluate the health and performance of your website.
  • Content Assistant: Get help with optimizing your content for better search engine visibility.
  • AI Credits Monthly: Utilize AI-driven tools and features for enhanced SEO performance.

Pricing Plans

Here’s a breakdown of what you can expect from different tiers of the tool:

Free Trial

  • Cost: Free (1 month)
  • Key Features: Limited daily searches, YouTube research, rank tracking, competitive analysis, backlink checker, site audit, content assistant, and AI credits.

Starter Plan

  • Cost: $17 per month or $169 per year
  • Key Features: 200 daily searches, 80 rank tracker keywords, 2000 site audits, and 5000 AI credits.

Pro Plan

  • Cost: $27 per month or $279 per year
  • Key Features: 500 daily searches, 200 rank tracker keywords, 5000 site audits, and 15000 AI credits.

Pros and Cons

Highly affordable pricing plansNo SERP based clustering (NLP/BERT based so accuracy is not great)
User-friendly interface suitable for beginnersNo cluster competitor analysis
Keyword clustering feature is freeNo cluster rank tracking capabilities
No SEO/Content workflow from Clusters

Number 12. Contadu

Contadu is a European SaaS tool designed to enhance your content using NLP recommendations, including semantic keyword suggestions. While it lacks a dedicated keyword clustering tool in its product suite, it offers two valuable free tools: a keyword mixer and a keyword clustering and grouping tool.

  • Keyword Mixer: Generates variations of specific keywords (such as “best,” “new,” “top,” etc.).
  • Keyword Clustering and Grouping Tool: This tool stands out for its speed, efficiently grouping hundreds of keywords quickly and accurately.

Sample Keyword Clustering Report

Here is a sample of the keyword clustering report generated by the tool. This is how it looks:

Pros & Cons

Fast keyword grouping toolNo SERP based clustering (NLP/BERT based so accuracy is not great)
A Basic keyword grouping and clustering tools are freeNo cluster competitor analysis
Decent topical clustering mapNo cluster rank tracking capabilities
GSC integrationBasic UI
Search intent mapped with semantics and not SERPs


  • Starter: €19/month for 100 keywords and 10 content reviews in the NLP editor
  • Freelance: €39/month for 500 keywords and 50 content reviews in the NLP editor
  • Business: €79/month for 1,500 keywords and 100 content reviews in the NLP editor
  • Agency: €149/month for 5,000 keywords and 250 content reviews in the NLP editor
  • Enterprise: €297/month for 15,000 keywords and 500 content reviews in the NLP editor

Contadu’s suite of tools, particularly its free keyword clustering and grouping tool, offers a quick and effective solution for organizing keywords, although accessing more advanced features requires a subscription upgrade.

  How to Use Keyword Clustering Tools Effectively

To get the most out of keyword clustering tools, follow this detailed guide:

  1. Identify Your Keywords: Start by gathering a comprehensive list of keywords relevant to your niche.
  2. Choose Your Tool: Select a keyword clustering tool that fits your needs. Popular options include Keyword Insights, SEMrush, Ahrefs, and Serpstat.
  3. Input Your Keywords: Enter your list of keywords into the tool.
  4. Analyze the Clusters: The tool will group your keywords into clusters based on relevance and search intent.
  5. Refine the Clusters: Review the suggested clusters and make any necessary adjustments to ensure they align with your content strategy.
  6. Implement the Clusters: Use the clusters to plan and create content. Each cluster can form the basis of a pillar page or a subpage.

Best Practices:

To ensure effective keyword clustering, consider these best practices:

  • Focus on User Intent: Ensure that the clusters align with what users are searching for and their intent behind those searches.
  • Maintain Relevance: Group keywords that are closely related to maintain the relevance of each cluster.
  • Update Regularly: Periodically review and update your keyword clusters to reflect changes in search trends and user behavior.
  • Leverage Data: Use the data provided by the tool to inform your content creation and optimization strategies.

Common Mistakes to Avoid:

Avoid these common mistakes to ensure your keyword clustering is effective:

  • Overloading Clusters: Don’t cram too many keywords into a single cluster; this can dilute the relevance.
  • Ignoring Search Intent: Failing to consider search intent can lead to ineffective clustering.
  • Neglecting Updates: Search trends change over time, so regularly update your clusters to stay current.
  • Poor Tool Selection: Using a tool that doesn’t fit your needs can lead to suboptimal clustering. Choose a tool that matches your requirements.


Effective keyword clustering is a cornerstone of modern SEO strategy, helping businesses improve their search engine rankings, avoid keyword cannibalization, and uncover new long-tail keyword opportunities. The tools discussed in this article each offer unique features and pricing plans tailored to different needs, whether you are a small business, a large enterprise, or an SEO professional.

By integrating keyword clustering tools like Keyword Insights, Ahrefs Keyword Explorer, Key Clusters, Keyword Cupid, Surfer SEO, SEMrush, SE Ranking Keyword Grouper, Serpstat, and SEO PowerSuite, you can streamline your SEO efforts and focus on creating high-quality, targeted content that meets your audience’s search intent. Each tool brings its strengths to the table, from comprehensive keyword databases and SERP analysis to automated clustering and content optimization.

Choosing the right tool depends on your specific needs, budget, and the complexity of your SEO campaigns. Start by evaluating the features that align with your objectives, and take advantage of free trials and flexible pricing plans to find the perfect fit for your SEO toolkit. With the right keyword clustering tool, you can enhance your content strategy, establish topical authority, and ultimately drive more organic traffic to your website.

Andy Chadwick

Andy Chadwick

Andy Chadwick is a digital marketing consultant, specializing in SEO. He has been in the industry since 2013 and worked with start-up companies (he grew his own start-up to a turnover of £2.5 million in 3 years) as well as international organizations. He’s also worked in-house as well as agency side. Andy runs a successful SEO consulting business in the UK as well as Snippet Digital SEO consultancy with Suganthan.

Start your trial today for only $1

Sign up today for a $1 trial and enjoy access to 6000 keyword clustering credits, 3 Keyword discovery searches, 1 Content Brief and Pro versions of SERP Similarity, SERP Explorer.

Table of contents

    Start your trial today for only $1

    Sign up today for a $1 trial and enjoy access to 6000 keyword clustering credits, 3 Keyword discovery searches, 1 Content Brief and Pro versions of SERP Similarity, SERP Explorer.

    Subscribe to our newsletter

    Subscribe to get our latest news, offers, insights, and any updates.