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In today's digital age, traditional keyword optimization alone isn't enough to stand out. 

Google now places a strong emphasis on E-E-A-T: Expertise, Authoritativeness, and Trustworthiness. Simply cramming keywords into your content won't cut it anymore. You need a new approach.

That's where keyword clustering tools come into play.

In this blog post, I will introduce you to the 10 best keyword clustering tool options that can transform the way you streamline your SEO strategy. These keyword grouping tools will empower you to go beyond simple keyword grouping and unlock the power of topical authority.

So, let's dive in!

WriterZen logo

WriterZen is your essential online class assistant. It uses AI to provide real-time transcriptions, note-taking, and summaries, making learning easier and saving you time from manual transcription tasks.


SE Ranking 

Trinka offers over 3,000 grammar checks, improves vocabulary and tone, aligns with style guides, provides contextually relevant suggestions, outperforms other grammar checkers, and offers attractive pricing.

surfer seo logo

Surfer SEO

Speechify turns words into sound. It helps students read better by letting them listen to the text. It reads faster than normal, so it saves time too. You can use it on your computer, phone, or tablet. It sounds like a real person and works with all kinds of stuff you read. It makes learning easier and helps you get more done.

What Are The Best Keyword Clustering Tools?

Here are 10 keyword clustering tools to help you create topical cluster:

  • WriterZen
  • SE Ranking Keyword Grouper
  • Surfer SEO
  • Serpstat
  • Keyword Insights
  • Keyword Cupid
  • Inkforall
  • KeyClusters
  • Keyword Clarity
  • Cluster AI

1. WriterZen

WriterZen logo

WriterZen Summary 



Disclosure: Links to other sites may be affiliate links that generate a small commission at no extra cost to you.



WriterZen is an all-in-one solution for keyword research, keyword clustering, content creation. With WriterZen, you can easily establish your expertise and authority in your niche by starting your content workflow with targeted topics that satisfy Google's E-E-A-T guidelines.

This tool helps you build contextual support with its Topic Discovery feature. It connects articles that stimulate search engine bots, enabling them to explore your entire website and gain a competitive edge. 

Additionally, it uncovers valuable topic insights from your competitors and utilizes user search intents extracted from 'Google Suggest'.

The Keyword Explorer feature allows you to zero in on curated keywords directly from Google's vast database, satisfying customer intent and enhancing your credibility. 

With cutting-edge metrics and the Golden Filter, you can identify high-converting keywords with low competition and automate the process of grouping keywords based on ranking attributes. 

The Revenue Forecast feature helps you identify keywords that drive organic traffic and convert it into sales, providing valuable insights for your targeted keyword list. 

When it comes to writing, WriterZen's Content Creator excels at its job. It provides a smooth and user-friendly experience with its SEO-optimized text editor, allowing you to bring your content to life effortlessly. 

Additionally, it leverages your competitor knowledge and competitor keyword insights, enabling you to gain a deep understanding of industry expectations and build coherent outlines that align with your goals. 

You can also enhance your content's relevancy with suggested NLP terms from Google and create impactful pieces that top the charts. 

My Experience With WriterZen

writerzen user experience

WriterZen has a user-friendly and sleek interface. Personally, I find the Topic Discovery feature to be my go-to starting point. It lets me to uncover a wide range of subtopics related to my seed keywords.

keyword clustering with WriterZen

What I really like about Writerzen, especially in comparison to SurferSEO, is the option to import my keyword list from other keyword research tools like Ahrefs. This feature truly saves me time and effort. 

I can then take advantage of the keyword golden filter to easily identify and filter out low competition keywords based on their "golden score." And when it comes to keyword clustering, Writerzen's tool is a game-changer. It effortlessly groups together keywords with similar topics, making my workflow much smoother and more efficient.

Key Features

  • Identify targeted topics that meet Google's E-A-T criteria
  • Narrow down your search with a vast collection of keywords directly sourced from Google's databases
  • Simplify the process of grouping keywords based on ranking attributes through an automated feature, saving time and improving organization.
  • Pinpoint keywords that drive organic traffic and convert them into sales, while also estimating the potential revenue volume for your targeted keyword list.
  • Gain insights from top competitors' articles, enabling you to understand industry expectations and craft coherent outlines accordingly.
  • Utilize the power of GPT-3 powered A.I. to enhance your writing
  • Ensure originality by comparing your content against billions of web pages in Google's database, safeguarding against duplicate content penalties.


WriterZen - Pricing

WriterZen offers a 30% discount for the annual plan. You can also experience WriterZen with a 7-day free trial, no credit card required

  • Lite: Ideal for solo users handling single project work, priced at $19 per month.
  • Plus: Perfect for power users seeking unlimited AI support, priced at $79 per month.
  • Pro: Great for small teams working on multiple projects, priced at $199 per month.
  • Ultra: Designed for medium teams with scalable projects, priced at $359 per month.
  • 2. Surfer SEO



    While many people are familiar with Surfer SEO for its exceptional on-page content optimization capabilities, it offers much more than that. 

    Surfer is a comprehensive SEO tool that includes powerful keyword research features. By simply inputting a seed keyword, Surfer enables you to uncover a wealth of valuable keyword data. 

    You can explore related keywords, analyze search volumes, and search intent, and assess keyword competitiveness to inform your content strategy effectively. 

    Surfer's keyword research feature empowers you to discover the most relevant and high-performing keywords for your content, helping you optimize your website for increased visibility, organic traffic, topical authority, and improved search engine rankings

    With Surfer, you have all the tools you need to take your keyword clustering and content writing to the next level and achieve outstanding results in your SEO efforts.

    My Experience With Surfer SEO

    finding related topics with surfer SEO

    Despite lacking the "keyword importing" and advanced filtering features found in WriterZen, Surfer SEO still impresses me with its ability to find relevant informational posts to complement my transactional content.

    All I need to do is input the seed keyword into the Keyword Research feature, and Surfer SEO does a fantastic job of delivering valuable results.

    Key Features

    • Helps you write high-ranking articles with real-time feedback on on-page optimization and relevant keywords.
    • Discover valuable keywords, assess competitiveness, and enhance keyword clustering for an effective content strategy.
    • Surfer's content editor offers relevant keywords and real-time optimization measures, empowering you to write confidently.
    • Generate catchy headlines and create detailed content outlines using Surfer's Outline Builder.
    • Optimize content in any language using real-time metrics for structure, word count, NLP-ready keywords, and images.
    • Plagiarism checker.


    Surfer - Plans & Pricing

    From May 2023, Surfer has changed its pricing plan:

    LITE: $19/month (billed annually), 36 Content Editor credits included, $8 per additional Content Editor credit

    ESSENTIAL: $69/month (billed annually), 84 Content Editor credits included, $5 per additional Content Editor credit, 2 organization seats

    ADVANCED: $149/month (billed annually), 300 Content Editor credits included, $3 per additional Content Editor credit, 5 organization seats

    MAX: $249/month (billed annually), 600 Content Editor credits included, $3 per additional Content Editor credit, 10 organization seats

    3. Inkforall


    Inkforall is  an all-in-one tool for content planning and writing. It helps you create engaging content for your website, build authority, and win your audience's trust. Plus, it protects your brand from AI mistakes and plagiarism. No one wants to get in trouble for copying someone else's work!

    Why I Recommend Inkorall

    One of the awesome things about Inkforall is their AI Keyword Clustering tool.

    The best part is, you don't need to be an SEO expert to use it! You can simply copy and paste your list of keywords or import them from other tools you like using.

    Then, just click "analyze," and Inkforall's AI will do all the hard work for you. It'll use the latest search results from Google to make sure your groups are accurate and up-to-date.

    Before Inkforall, creating these keyword clusters used to take hours, but now it's just a single click! Imagine all that time saved and still getting awesome results.

    Oh, and guess what? You can try it for free! Yeah, no credit card needed or anything. You get to see how it works and if it's right for you. Lots of people love it and have already created thousands of accounts in just a week.

    Inkforall is like an all-in-one tool for content planning and writing. It helps you create engaging content for your website, build authority, and win your audience's trust. Plus, it protects your brand from AI mistakes and plagiarism. No one wants to get in trouble for copying someone else's work!

    They've got amazing customer support and a friendly community to help you out too. They're always there to answer your questions and share ideas.

    Remember, you can try Inkforall for free, and who knows, it might just be the perfect tool to take your website to the next level! Give it a go and see for yourself. Happy writing!

    4. Serpstat

    Keyword Clustering Tool


    The Keyword Clustering Tool by Serpstat is a powerful solution for grouping keywords based on their similarity in search engine result pages (SERPs).

    Here's what you can do with this tool from Serpstat:

    • Group up to 50,000 keywords by their SERPs similarity
    • Customize clustering parameters to tailor the results to your specific needs.
    • Add your domain name to receive recommendations on which page a certain keyword cluster is best suited for implementation.
    • Choose the Connection Strength to create keyword clusters with closely related thematics.
    • Set the Type of Cluster to group keywords based on matching URLs in the top 30 search results.
    • By combining different settings, you can optimize your website with powerful keyword combinations.

    Key Features

    • Exports the generated keyword clusters along with a list of keywords included in each cluster.
    • Compare keyword volume and connection strength to make informed decisions.
    • You can manually add, delete, or move keywords between clusters for better organization.
    • Track your website's rankings by specific keywords in different regions.
    • Utilizing AI and machine learning for content creation and editing.


    Serpstat plans and pricing
    • Lite Plan: Monthly: $55/mo | 12 Months: $69/mo | Features: Ideal for SEO-individuals, freelancers, and SMBs with limited budgets.
    • Standard Plan: Monthly: $119/mo | 12 Months: $149/mo | Features: Suitable for established in-house teams and marketing agencies.
    • Advanced Plan: Monthly: $239/mo | 12 Months: $299/mo | Features: Best value for big marketing agencies and large in-house teams.
    • Enterprise Plan: Monthly: $399/mo | 12 Months: $499/mo | Features: Perfect for industry leaders and big enterprises.

    Besides, you can opt for a free 7-day trial of the full-featured paid plans.

    5. Keyword Insights

    Keyword Clustering Tool of keyword insights


    The powerful Keyword Clustering Tool of Keyword Insights is designed to optimize your keyword strategy. Simply upload your keyword list, and let the tool analyze the search engine result pages to group similar keywords together.

    With this tool from Keyword Insights, you can easily create content that ranks for multiple low-volume, low-difficulty keywords instead of solely focusing on high-volume ones. This approach makes content creation more manageable and organically rewarding.

    Wondering when to create separate pages or target keywords on the same blog post?

    Keyword Insights takes the guesswork out of content production. By analyzing live search results pages, Keyword Clustering Tool helps you make informed decisions in seconds, ensuring your pages stand the best chance of ranking.

    By analyzing your current rankings and ranking URLs for each cluster, you can quickly spot areas where your content is lacking then fill those gaps effectively to improve your overall content strategy.

    You can adjust the URL overlap, select the clustering algorithm that suits your needs, and set the level of strictness for the NLP analysis.

    With the topical modeling feature, you can easily organize and structure your content around specific topics, ensuring a cohesive and strategic approach.

    Besides providing actionable insights through cluster analysis, this tool's algorithm carefully examines output clusters, selects the best keyword from each one, and highlights it for
    content briefing and writing. This saves you time and effort in content creation, as you can quickly identify the most impactful keywords to target.

    This tool also ensures higher accuracy and reliability in grouping keywords together by analyzing actual Google search results, unlike other tools that rely solely on Natural Language Processing. 
    This approach ensures higher accuracy and reliability in grouping keywords together.

    Key Features

    • Analyze actual Google search results for accurate keyword grouping..
    • Optimize content for multiple low-volume, low-difficulty keywords to achieve better results.
    • Quickly determine whether to create separate sub-topics or target keywords on the same blog using live search results and keyword grouping.
    • Identify content gaps by analyzing current ranks and ranking URLs for each cluster.
    • Customize keyword clustering settings, including URL overlap, clustering algorithms, and NLP strictness.
    • Simplify topical modeling by understanding semantic relationships between keyword clusters.
    • Gain actionable insights through cluster analysis and content briefing using an in-house algorithm.
    • Access live, country-specific SERP data for each query in the clustering report.
    • Enhance the clustering report with GPT-3 technology for generating content title ideas.


    pricing - Keyword Insights

    Keyword Insights provides 4 different pricing plans to cater to various needs. By opting for an annual plan, you can enjoy a 15% discount.

    • Basic plan: $49/month, 6,000 Credits, 6,000 Keywords, 60 Content Briefs, 12,000 Searches, Public API, 3 Users, LiveChat Support, Integrations, Customer Onboarding, Team Training, Early Access Features.
    • Professional plan: $99/month, 15,000 Credits, 15,000 Keywords, 150 Content Briefs, 30,000 Searches, Public API, 5 Users, LiveChat Support, Integrations, Customer Onboarding, Team Training, Early Access Features.
    • Premium plan: $299/month, 45,000 Credits, 45,000 Keywords, 450 Content Briefs, 90,000 Searches, Public API, 10 Users, LiveChat Support, Integrations, Customer Onboarding, Team Training, Early Access Features.
    • Agency plan: $599/month, 100,000 Credits, 100,000 Keywords, 1,000 Content Briefs, 90,000 Searches, Public API, 30 Users, LiveChat Support, Integrations, Customer Onboarding, Team Training, Early Access Features.

    Keyword Insights offers subscription and "pay as you go" pricing options that provide flexibility to suit your preferences and usage patterns.

    You can also grab a free trial! It's just $1 for 750 credits. With those credits, you can:

    • Cluster up to 750 keywords
    • Or create 7 briefs
    • Or run 1500 keyword discovery searches.

    6. Keyword Cupid


    Keyword Cupid

    Keyword Cupid is designed to transform your content strategy by utilizing advanced neural network models

    It reverse engineers Google's knowledge graph in real-time, giving you unparalleled insights. 

    With live data scraping and machine learning, it empowers you with a comprehensive and optimized content strategy, placing keyword clustering at the forefront. 

    You can now say goodbye to endless hours of manual keyword research as Keyword Cupid automates the process, allowing you to focus on what truly matters. 

    By creating the right pages that align with Google's ranking criteria and implementing effective interlinking strategies, you can boost your topical authority and establish a strong online presence. 

    What sets Keyword Cupid apart is its ability to save you time and money, removing all the uncertainties that come with keyword selection. It generates perfect topical clusters effortlessly, even if you have no domain knowledge or advanced SEO experience. 

    Key Features

    • Automatic keyword clustering based on Google's algorithm
    • Efficiently cluster thousands of keywords
    • Create fully relevant content silos
    • Improve rankings on Google
    • Establish a powerful and relevant silo structure
    • Delegate content strategy and blog post creation
    • Gain on-page insights on ranking factors
    • Boost topical authority
    • Capture user search intent
    • Premier tool for keyword clustering and research


    Pricing - Keyword Cupid

    Keyword Cupid offers 4 different pricing options tailored to meet your keyword needs: 

    • STARTER: $9.99/month for 1 user account and 500 keyword credits/month.
    • FREELANCER: $49.99/month for 5 user accounts and 5,000 keyword credits/month.
    • AGENCY: $149.99/month for 10 user accounts and 20,000 keyword credits/month.
    • ENTERPRISE: $499.99/month for 20 user accounts and 80,000 keyword credits/month.

    7. SE Ranking Keyword Grouper

    SE Ranking Keyword Grouper Tool


    SE Ranking is an all-in-one SEO software that simplifies your SEO tasks and makes them easier to manage.

    SE Ranking offers a comprehensive suite of powerful tools, including keyword rank tracking, backlink monitoring, on-page SEO checker, white label solutions, keyword research, marketing plans, and social media analytics with auto-posting capabilities. 

    In addition to these features, SE Ranking also excels in keyword clustering with its advanced tool known as Keyword Grouper.

    SE Ranking's Keyword Grouper is an advanced tool for precise keyword grouping. The tool extracts highlighted keywords from SERPs, expands your semantics, and allows you to check search volumes on the fly. 

    With flexible grouping options, including country and language preferences, you can tailor the clustering process to your needs.

    The results provide grouped keywords, search volume data, and highlighted keywords from Google. 

    Key Features

    • Keyword Grouper for advanced and precise keyword grouping
    • Keyword rank tracking across major search engines
    • SEO/PPC competitive research to discover competitors' keywords and ads
    • In-depth website audit to improve rankings with on- and off-page issue identification
    • Backlink checking and monitoring for comprehensive backlink analysis
    • Page changes monitoring to receive alerts about modifications on your or your competitors' sites
    • On-Page SEO Checker for effective page optimization
    • White Label solution for creating your own professional SEO service
    • Marketing plan creation with SEO checklist, website analysis, and custom goals
    • Social media analytics and auto-posting capabilities
    • SEO reporting tools for comprehensive performance analysis
    • Traffic analysis to monitor website traffic patterns
    • Snippet crawler to preview and optimize search engine snippets
    • Mobile app for managing SEO tasks on the go


    SE Ranking Pricing Plans

    SE Ranking offers a range of pricing options to suit your needs, including a 20% discount with the annual plan:

    • Essential: $39/month or $31.20/month (annual plan)
    • Pro: $89/month or $71.20/month (annual plan)
    • Business: $189/month or $151.20/month (annual plan)

    Additionally, you can enjoy a 14-day free trial without the need to provide credit card information.

    8. Cluster AI



    ClusterAI is an amazing tool for keyword clustering that helps you achieve consistent rankings effortlessly. By harnessing data from Google's search results, ClusterAI can help you make smarter decisions about keywords and avoid costly mistakes. 

    With ClusterAI, you can slash your keyword research time by 90%, allowing you to focus on what matters most. Also, you don't even need a credit card to get started. You can try it out for free with 200 keywords and cancel anytime if it's not your cup of tea. 

    ClusterAI is trusted by top brands like MOZ and Ahrefs and it's incredibly easy to use. Simply build your keyword list using your favorite SEO tool, import it into ClusterAI, and let the tool do its magic. 

    ClusterAI crawls search engines, compares keywords, and clusters them intelligently. In just a matter of minutes to a few hours, you'll receive comprehensive keyword groupings, including variations of your main keyword and the total search volume of the grouped keywords. 

    Key Features

    • Utilize automated keyword research with data from Google SERPs
    • Import your keyword list from popular SEO tools like Ahrefs, SEMRush, or Google Search Console, ensuring compatibility.
    • ClusterAI compares keywords against each other, analyzing the number of pages that rank for both sets of keywords.
    • Identify sets of keywords where three or more pages rank together, indicating the potential to rank for those keywords with one page.


    ClusterAI offers a hassle-free free trial without the need to provide credit card information, giving you the freedom to cancel your subscription whenever necessary. Also, you can get started with 200 free keywords to experience the power of ClusterAI firsthand.

    What is a Keyword Clustering Tool?

    A keyword clustering tool is designed to help you group and organize related keywords based on their semantic similarity and search intent. It allows you to create a structured content strategy by organizing keywords into clusters, consisting of a central "pillar page" and supporting "cluster pages."

    topic clustering

    Think of the pillar page as the foundation of your content. It covers the main topic comprehensively, acting as a hub of valuable information. 

    On the other hand, the cluster pages delve into specific subtopics or aspects related to the pillar page. These pages target long-tail keywords and provide detailed insights to further establish your website's authority and relevance.

    Why Use a Keyword Clustering Tool?

    By utilizing a keyword clustering tool, you can streamline your keyword research process and effectively group keywords based on their relationships and significance. This not only saves you time but also helps you identify content gaps and create a cohesive SEO content marketing campaign.

    In summary, a keyword clustering tool is a valuable asset for any SEO practitioner or blogger. It empowers you to organize your keywords, create meaningful content clusters, and optimize your website's structure and visibility. With this tool in your arsenal, you can enhance user experience, improve search engine rankings, and drive targeted organic traffic to your site


    What is semantic clustering in SEO?

    Semantic clustering in SEO is the practice of grouping together semantically related keywords and topics based on their contextual relevance and meaning. By clustering similar terms and concepts, search engines can better understand the overall theme and intent of the content, leading to improved search visibility and rankings.

    How do you create a topic cluster?

    To create a topic cluster, start by identifying a core topic or pillar page that represents a broad subject area. Then, create subtopics or cluster pages that delve into specific aspects or related sub-themes of the main topic. Interlink the cluster pages with the pillar page using anchor text, demonstrating the relationship and signaling to search engines the comprehensive coverage of the topic.

    Final Thoughts

    In the ever-evolving world of SEO, staying ahead of the competition requires the best keyword clustering tools and strategies. When it comes to keyword clustering, Writer Zen stands out as the best keyword clustering tool available. 

    With its advanced features and intuitive interface, it empowers you to unlock the true potential of your keyword research and content optimization.

    I've personally used Writer Zen for my blog and witnessed remarkable results in my search engine rankings. The accuracy and efficiency of its keyword clustering capabilities have allowed me to target the right audience and drive organic traffic to my content.

    So, if you're serious about optimizing your website's performance and dominating the search engine results, I highly recommend trying Writer Zen. 

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    About the Author Millie Pham

    Meet Millie Pham - an SEO content marketer and video editor who loves exploring the latest tech and AI tools. She provides honest reviews and demystifies the world of AI, SEO, and blogging, making these complex topics accessible and easy to understand for everyone. Her work has been featured on Marin Software, jobillico, Nicereply, and other sites.

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