5 Best Keyword Clustering Tool 2023: Best SEO Keywords Grouping Tools

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Several thousand relevant keywords have been collected for your site. Your list may have been compiled by researching keywords for which your site already ranks.

It is also possible that you have checked your competitors’ keywords using popular keyword tools such as SEMrush and Ahrefs. It’s now time to build a content strategy based on those keywords.

Clustering keywords, or simply grouping keywords, become useful in this case.

Semantically-related keywords can be grouped, allowing you to organize your site into logical content silos or keyword clusters. You can gain more traffic from Google by following an approach like this.

When you’re trying to group thousands of keywords manually, it can be quite challenging. To make that process easier, you can use a few tools.

I have compared five of the best tools for grouping SEO keywords.

5 Best Keyword Clustering Tool 2023

Let’s talk about some of the best keyword clustering tools now:

1. SE Ranking

SE Ranking includes keyword clustering as one of its many features. SE Ranking is undoubtedly one of the best tools for carrying out this task for you.

Possibly the most accurate keyword clustering tool on the market is SE Ranking’s Keyword Grouper.

SE Ranking compares the top ten search results for two keywords during the clustering process. It will group them in the same topic if they have the same search listings, then repeat the process for the remaining keywords.

To enhance clustering accuracy, you can also specify how many similar listings to use, unlike other keyword clustering tools.

SE Ranking Home - Best Keyword Clustering Tool

It is possible to set the minimum number of matching URLs to 3, which will prevent keyword searches from showing more than three similar URLs.

A fascinating aspect of SE Ranking is that you can specify a grouping. In this case, you can choose the search engine you want, as well as the country, location, and language.

Thus, it is extremely useful for creating keyword clusters for phrases that aren’t in English, which is excellent for multilingual websites.

As a final feature, SE Ranking provides an option to add search volume to each keyword in the cluster. By using this feature, not only can you see the monthly search volume of keywords in the cluster, but also an aggregate search volume for the cluster you want to target.

If you want to import data from other sources, you can do so from Google Search Console, Google Keyword Planner, or other SEO tools such as Ahrefs and SEMRush.


You must subscribe to SE Ranking’s paid plan to use its Keyword Grouper. As low as $18.60 per month is the lowest possible price. A separate fee of $0.004 per keyword is also required to use the Keyword Grouper.

According to this example, clustering all 1,000 keywords will cost $4, which is neither cheap nor overly expensive. It costs an extra $0.005, however, if you want to know the search volume for every individual keyword.

SE Ranking Pricing

If you upload your keyword list (for example, from another SEO tool such as Ahrefs), which already includes search volume information, then this add-on isn’t necessary.

Pros & Cons

Here are some of the pros and cons of SE Ranking:


  • A tool for clustering keywords accurately
  • Keywords other than English can be clustered
  • Accurately cluster locations, languages, etc.
  • User-friendly


  • The tool is not part of the regular plans, so users must pay extra if they wish to use it.
  • The cost of searching volume data is high.

2. Serpstat

Another leading SEO tool, Serpstat, provides features that help you create keyword groups and clusters to improve the structure of your site’s content.

Using a list of keywords, Serpstat will create clusters that include long-tail and short-tail keywords. To ensure accurate results, semantics and keyword intent, as well as the top 30 search listings, will be taken into account during the creation process.

Serpstat Home - Best Keyword Clustering Tool

Additionally, clustering settings can be customized. If you choose weak, medium, or hard clustering, for example. Despite the lower degree of customization than SERanking, you can still change the results to suit your needs.

I find that the best feature of Serpstat is that it can analyze your published posts and create keyword groups relevant to those posts. By avoiding cannibalization issues, you can construct an effective site structure.


The keyword clustering tool is available to all Serpstat plans. Customers can choose from four different plans provided by Serpstat:

Serpstat Pricing

  • Lite – $69 per month
  • Standard – $149 per month
  • Advanced – $299 per month
  • Enterprise – $499 per month

The Lite plan allows you to cluster up to 1,500 keywords. As you upgrade, this number will rise. In addition to keyword research, backlink analysis, site audits, rank tracking, and more, all plans include other SEO features.

According to my experience with keywords, 1,500 per month is too few, especially if you have a long list (one short-tail, general keyword search, such as “bicycle”, could produce thousands of variations.)

You should therefore select at least the Standard plan (6,000 keywords per month). Otherwise, the quota should only be used on specific keywords that describe your niche.

You may be required to pay additional fees if you require search volume data. If you would like to inquire about pricing, contact SerpStat directly.

Pros & Cons

Here are some of the pros and cons of Serpstat:


  • Up to 30 top search queries will be gathered
  • Create topical clusters from published posts relevant to the page
  • The grouping of keywords can be customized
  • Consider semantics as well as user intent
  • Regular SEO plans include keyword clustering (without extra charge)


  • Search volume data must be paid for separately (not recommended)
  • It is difficult to use Serpstat’s user interface.

3. Surfer SEO

Using Surfer SEO, you can optimize your content for search engines. The developers of the software have recently introduced a feature allowing users to create topic clusters using a fully automated process. Using this keyword clustering tool is the most useful thing I do as a Surfer SEO customer.

Let’s see how it goes.

You need to start by inserting the main keyword. It should be broad and general. Your website plans to cover a major topic or category extensively, in my opinion.

Your content planner will be ready in a few minutes, thanks to artificial intelligence. The keyword “artificial intelligence” is associated with 159 clusters on Surfer SEO.

The topics in Surfer SEO are sorted by relevance by default. Search volume is also available as a sorting option.

Surfer SEO Home - Best Keyword Clustering Tool

There are so many topics that you may feel overwhelmed by. You can, however, filter your results based on your search intent (customer investigation, local, shopping, and informational.)

Since the other two do not apply to my niche, I tend to target clients with “customer investigation” and “informational” skills.

Data on monthly search volumes will be attached to each keyword. SE Ranking and Serpstat are free.

Surfer SEO does not disclose how its keywords are clustered. Results appear relevant, however. The most popular keyword for that topic (with the highest search volume) will be used for the topic name.

A content editor can then be created to optimize that along with other keywords on the topic.

This tool has only one disadvantage – external data cannot be imported. Surfer SEO’s keyword tool offers decent data, which you should use. You may also find more keywords at Ahrefs. Still, I consider the topic clusters Surfer SEO provides to be more than adequate.


Surfer SEO plans include the content planner. Prices start at $29. Surfer SEO also comes with fantastic features such as content editor, SERP Analyzer, and many more.

Surfer SEO Pricing

No hidden fees apply. You only pay this amount. A keyword clustering plan starting at $29 per month is more than sufficient if that is all you need. There is no free trial for Surfer SEO. Nonetheless, you can get your money back within 7 days.

Pros & Cons

Here are some of the pros and cons of Surfer SEO:


  • Easy to use
  • Providing accurate results based on search intent and search volume
  • Faster than other tools at clustering multiple keywords
  • Fees are not hidden. Keyword clustering is available to all plans.
  • The content optimization tool integrates well with it.


  • Keyword clustering cannot be customized
  • Uploading your keywords is not possible

4. WriterZen

Content optimization is a highly competitive industry, and WriterZen is a new entrant. The tool not only provides an excellent keyword clustering tool with extremely generous resources but also aims to help content writers optimize their content.

Using this feature is straightforward. Simply use it as you would any traditional keyword tool.

The topic clusters will appear after a while.

WriterZen Home - Best Keyword Clustering Tool

Since WriterZen compares results from Google SERPs with other keyword grouping tools, it’s not surprising that the results are quite accurate.

There are a lot of great features in this package, including keyword trends, monthly search volume, PPC competition, CPC, and Allintitle ratio for each keyword in each topic.

Unlike Surfer SEO, this tool, however, does not allow you to import your keywords for WriterZen to group them for you. Due to WriterZen’s limited keyword data, the number of topics may be a bit limited.


Every WriterZen plan includes keyword clustering. The following are the two paid plans available:

WriterZen Pricing

  • Premium – $49 per month
  • Platinum – $70 per month

Using the Platinum plan, you can cluster up to 1,000,000 keywords per month. This is more than enough for content marketers.

Creating content briefs and discovering topics are also included in all plans, which can be useful in producing high-ranking content.

Pros & Cons

Here are some of the pros and cons of WriterZen:


  • Results that are precise and fast
  • Easy-to-use interface
  • Value for money + affordability
  • Keyword clustering resources are abundant
  • Rich data is provided for each keyword


  • Clustering on site is not possible with your keyword collection

5. Cluster AI

The Content Distribution tool Cluster AI only performs keyword clustering for its users. By reducing keyword research time by up to 90%, the company claims its software helps users make better keyword decisions.

Here’s what you’ll have to do.

With Cluster AI, you won’t receive keyword data like with other tools. It will be your responsibility to import the keyword data from third parties.

Cluster AI

In the keyword list type box, Google AdWords, Ahrefs, and SEMRush are mostly supported. If you can export the data in a CSV file, you may be able to use data from any keyword tool.

Afterward, you will need to import the CSV file into Cluster AI, choose the country you wish to search in, and add your email address so that you will be notified when the search is complete.

For Cluster AI, the first ten search results will be crawled and keyword data gathered. For keywords that rank for more than three pages, Cluster AI will group them. Consequently, it is more or less the same as SE Ranking and Serpstat.

Cluster AI spent almost an hour processing 700 Ahrefs keywords. A download link will be provided.

The results show the main keywords (serving as the topic name), monthly search volume, and variations for each keyword. You can target the main keyword for this particular blog post since you can rank it for other variations as well.

Results are useful, but underwhelming, unfortunately. Other tools offer more detailed information and features, so I expect more from this one.


Cluster AI offers customers a variety of plans.

  • Hobbyist – $39 per month
  • Consultant – $89 per month
  • Team – $179 per month
  • Team+ – $249 per month
  • Agency – $389 per month
  • Enterprise – $699 per month

There is a single feature in the tool for all plans, which means they all have the same features. Plans with more resources will be able to cluster keywords more effectively. This will result in lower costs per keyword.

Users on the Agency plan, for example, can cluster up to 50,000 keywords per month. Keywords cost $0.008 each.

Cluster AI doesn’t offer the best value for money based on its pricing. They are more expensive than most of their competitors, while their features are limited. Hence, using another tool, such as SE Ranking, would be a better option at this point.

Pros & Cons

Here are some of the pros and cons of Cluster AI:


  • Adaptable to any search country
  • Easy-to-use, straight-forward
  • Useful results


  • Cluster AI does not provide keywords. You must import keyword lists from other SEO tools.
  • The features are limited. It only performs keyword clustering.
  • Costly

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Conclusion: Best Keyword Clustering Tool 2023

I have found something useful in all the tools I examined. But what were the top tools? Well, SE Ranking and ClusterAI were both stellar.

SE Ranking’s Keyword Grouper may be the most accurate tool on the market for clustering keywords.

Using SERP as a basis for creating variations is what makes Cluster AI stand out.

All in all, keyword clusters remain the most relevant way to create pages that are relevant to a search term and maybe a better strategy than focusing purely on one keyword.

If combined with a search volume analysis, it’s a powerful content planning tool. Consider the case of extracting thousands of keywords from Google Search Console. Then you can group them and identify the major groups of keywords.

Now, not every keyword group is created equal. Certain keywords will drive more traffic to your website. By using a keyword tool, you could find out what keyword groups receive the most searches, and choose which ones to target. 

Sonia Allan

Sonia Allan has an excellent and surprisingly equal command over both editing and writing. She’s venerated for her flexibility, research skills, understanding of SEO, organizational skills, and communication. She keeps pace with the latest writing trends and she’s known for her patience exhibiting formidable editing skills. She is known for her intense proofreading and editing capacity that makes her the cornerstone of AffiliateBay.

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