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Looking for the best best keyword clustering tool?

It's a smart move, as traditional keyword optimization alone isn't enough to stand out in today's market.

Google now places a strong emphasis on E-E-A-T: expertise, authority, 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 8 best keyword grouping 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!

What Are The Best Keyword Clustering Tools?

Here are 8 tools to help you cluster keyword and create topical cluster:

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

1. WriterZen

WriterZen logo

Millie's Take 

I've been using WriterZen for almost a year and it's honestly made a huge difference. It's great for digging up topics and keywords that really connect with my audience. Plus, the content creation part is super user-friendly. Definitely a game-changer for my website.

Out of 10
  • Best Overall
  • Price: $23/mo
  • Annual Price: $19/mo


WriterZen is an all-in-one solution for keyword research, keyword clustering, and 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'.


Why I Recommend WriterZen

The Keyword Explorer feature lets you tap into Google's extensive keyword database, meeting customer search intent and boosting your credibility.

With advanced metrics and the Golden Filter, pinpoint high-converting, low-competition keywords and simplify the keyword grouping process based on ranking attributes.

The Revenue Forecast feature identifies keywords that not only drive organic traffic but also have the potential to increase sales, offering valuable insights for your keyword strategy.

WriterZen's Content Creator shines with its user-friendly, SEO-optimized text editor, making it easy to bring your content to life.

It also leverages competitor knowledge and keyword insights, helping you understand industry benchmarks and create outlines that support 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.

What I Like/Dislike About ElevenLabs

  • Offers a comprehensive suite of SEO and content optimization tools.
  • Allows you to uncover relevant topics and headlines from competitors.
  • Direct access to Google's keyword database, helping to uncover high-demand keywords
  • Includes a content creator for SEO content construction and team collaboration.
  • Built-in feature to check content for plagiarism.
  • Offers clear tutorials and guided workflows.
  • Includes an AI assistant for content generation.
  • The dashboard and features can initially be overwhelming for new users.
  • Certain features, like the golden filter, consume credits which are limited depending on the plan.
  • While it includes an AI writer, the content generated may be short or need further editing.
  • Requires time to fully understand and utilize all the features effectively.


writerzen pricing

WriterZen has a free trial, and after that, it starts at $19 per month (yearly plan).

2. Keyword Insights

Keyword Clustering Tool of keyword insights


Keyword Insights helps you create better content quickly, especially, for anyone who wants to be good at SEO, even if they're not an expert.

With Keyword Insights, you can come up with lots of keyword ideas, put them into groups that make sense together, and then use AI to make or improve your content without wasting time.

Now, let's talk about a special part of Keyword Insights called the "keyword clustering tool."

This tool takes your keywords and figures out which ones are similar in meaning or intent.

For example, it can tell you if the phrases "architect fees" and "how much are architects" should be in one article or two separate ones. 

Why I Recommend Keyword Insights

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.


Keyword Insights pricing

Keyword Insights offers a 4-day trial for just $1; after that, its basic plan starts at $58/month.

3. 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 SEO offers strong capabilities for keyword exploration. Enter a starting keyword, and Surfer will reveal an extensive array of insightful keyword details for you.

You can:

  • Explore related keywords
  • Analyze search volumes and search intent
  • Discover keyword competitiveness inform your content strategy effectively. 

Surfer's keyword research feature lets you 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.

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.

What I Like/Dislike About Surfer SEO

  • Offers suggestions to make your content better.
  • Can generate articles with AI.
  • Good for optimizing content already published.
  • Gives easy tips to improve content, like adding specific keywords.
  • Shows how well your content matches top-performing pages.
  • Helps find related keywords and create content around them.
  • Sends personalized recommendations based on your website data.
  • Expensive than other tools, especially when it comes to keyword keyword clustering tool

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 seo pricing

Surfer SEO starts at $199 per month.

4. Inkforall

ink homepage


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.

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.

And you can try it for free! Yeah, no credit card is 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.

Plus, 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! 


Inkforall pricing

Inkforall offers a free trial, but after that the paid plan starts at $39/month

5. 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.

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 starts at $9.99/month for 1 user account

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
  • 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.

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 free keyword clustering tool (as long as you stay using it for free) 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 or keyword grouper software 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 keyword grouping software available. 

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. 

5/5 - (1 vote)
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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