Keyword Clustering Tools: 11 Stand-Out Tools

In search of the best keyword clustering tools, we asked eleven professionals from the fields of SEO and business leadership to share their favorites. 

From Keyword Insights to Keyword Cupid, discover the top tools these experts swear on for effective keyword analysis and why they love them.

  • KeywordInsights.ai: Visualized and Adjustable Clustering
  • KeyClusters: Easy, Accurate, and Affordable Tool
  • Content Curator: Detail-Oriented Keyword Clustering
  • AnswerThePublic: Visualizing Search Queries
  • NeuronWriter: AI-Driven Keyword Clustering
  • Countwordsfree.com: Simple Keyword Analysis
  • Surfer SEO: Categorizing LSIs into Clusters
  • SE Ranking: Insight-Driven Keyword Clustering
  • KWFinder: Comprehensive Data and SERP Analysis
  • Keyword Cupid: Machine Learning-Driven Clustering
  • SEMrush: Comprehensive Database for Robust Capabilities

KeywordInsights.ai: Visualized and Adjustable Clustering

KeywordInsights.ai is one of the best keyword clustering tools that helps you visualize the keyword groups based on search volume and common URLs ranking on the first page. One key feature of the tool is that you can set the keyword grouping accuracy by a specific number of URLs in the SERP. 

This means if you want to group keywords that have at least five common URLs, you can do this by setting the accuracy number. This is great for increasing accuracy as the higher the common URLs, the more topically related the topics are. 

The best part is you can export the entire data set to Google Sheets or Microsoft Excel to add additional filters and skip irrelevant keywords from the list, if any.

Harshit Gupta, Entrepreneur and Digital Marketing Trainer, GrowthAcad

SEMrush: Comprehensive Database for Robust Capabilities

As an SEO strategist, one of my favorite keyword-clustering tools is SEMrush. SEMrush offers robust keyword-clustering capabilities that help identify keyword groups and themes based on relevance and similarity.

What sets SEMrush apart is its comprehensive database and advanced algorithms. It provides a wide range of keyword suggestions, related terms, and long-tail variations, enabling thorough clustering analysis. The tool also offers features like keyword-difficulty analysis, search-volume data, and competitive insights.

By using SEMrush’s keyword-clustering feature, I can effectively organize and group keywords, optimize content strategies, and identify content gaps. This helps improve keyword targeting, content relevance, and overall SEO performance.

Lukasz Zelezny, SEO Consultant, SEO Consultant London

KeyClusters: Easy, Accurate, and Affordable Tool

KeyClusters is a favorite keyword clustering tool. This cloud-based tool allows for easy clustering of keywords into related groups. It uses a variety of factors for grouping keywords, including their search volume, their semantic similarity, and their SERP results.

Some reasons KeyClusters is preferred include:

Ease of use: KeyClusters is a very easy-to-use tool. Upload your keyword list, and KeyClusters will do the rest.

Accuracy: KeyClusters is very accurate in clustering keywords. It uses a variety of factors to group keywords, ensuring that the clusters are relevant and accurate.

Affordability: KeyClusters is very affordable. It’s possible to use KeyClusters for free, with a variety of paid plans available.

Brenton Thomas, CEO, Twibi

Content Curator: Detail-Oriented Keyword Clustering

The Content Curator’s Keyword Clustering tool is relatively new, yet the level of experience within keyword clustering and attention to detail is clear from the output. 

The tool excels at breaking down the relationships between keywords, including the filtering of duplicates and synonyms, and the grouping of keywords with high SERP similarity. 

Users can adjust the settings to their preference, and the tool offers a simple export, along with exceptional support. The tool is recommended for any SEO professional. The developer offers the first 500 keywords free for every report, which helps save on credits.

Joe Cowman, Head of SEO, FATJOE

AnswerThePublic: Visualizing Search Queries

AnswerThePublic is a favorite keyword-clustering tool because it visually represents search queries as a web of related words, providing a unique perspective on keyword clustering. 

By understanding user intent through this visual representation, businesses can create highly targeted content that addresses specific needs. For example, if a business in the fitness industry wants to optimize its content for workout routines, AnswerThePublic can cluster related queries like “best home workout routines,” “cardio workout plans,” and “strength training exercises” visually intuitively. 

This allows them to identify the exact needs and concerns of their target audience, enabling them to craft interesting content that resonates with their users’ desired outcomes.

Ben Lau, Founder, Featured SEO Company

NeuronWriter: AI-Driven Keyword Clustering

In my role as CEO of Authors On Mission, ensuring our content is accessible and impactful is a top priority. NeuronWriter has proven to be an exceptional tool for keyword clustering, enhancing our SEO strategy. 

Its innovative AI capabilities streamline the otherwise complex process of organizing keywords. Beyond its user-friendly interface, NeuronWriter’s robust data processing ensures we can handle large volumes of data effortlessly. 

What sets it apart is the frequency of its database updates; it keeps our SEO practices current and competitive. By leveraging NeuronWriter, we have optimized our digital content, connect more effectively with our target audience, and provide unrivaled support to aspiring authors globally. 

This ultimately helps us fulfill our mission: sharing globally impactful stories and empowering authors on their journey.

Vikrant Shaurya, CEO, Authors On Mission

Countwordsfree.com: Simple Keyword Analysis

A super-quick way to understand a list of keywords, and ‌build keyword clusters, is to run a word count and phrase count on keywords exported from Google Search Console. A lot of SEO audits are done at WPSpeedFix.com, and this is a very simple way to understand search intent for a site with minor work. 

Typically, the list of keywords from Search Console is exported and run through a tool like countwordsfree.com, and then that data is imported back into a Google Sheet for analysis. 

Often, this technique will surface opportunities for buying searches that hide in the long tail, e.g., searches for “price” or “how to” searches that otherwise would be missed due to low volume.

Brendan Tully, Principal Consultant, WP Speed Fix

Surfer SEO: Categorizing LSIs into Clusters

Surfer SEO categorizes LSIs into clusters, so it’s my favorite tool for filling out my topical map. Sometimes the clusters are a little far afield of my target keyword, but even when that happens, it’s not all bad because it expands my thinking on the topic. I don’t know of other tools that start with defining topical authority as the goal.

Caroline Bogart, Writer, Best Red Light Therapy

SE Ranking: Insight-Driven Keyword Clustering

One of my favorite keyword-clustering tools is SE Ranking, because of its unique, insight-driven approach. What sets SE Ranking apart is its ability to group keywords into clusters and provide valuable insights into user intent and behavior. 

By analyzing the semantic relationships between keywords, SE Ranking helps me uncover hidden patterns and untapped opportunities. Its advanced algorithms go beyond primary clustering, allowing me to understand the underlying context behind keyword searches and tailor my SEO strategies accordingly. 

The tool’s intuitive interface and detailed reporting make it easy to visualize and interpret the clustering results, empowering me to make data-driven decisions. With SE Ranking, I get comprehensive clustering capabilities and gain a deeper understanding of my target audience, giving me a competitive edge in the ever-evolving world of SEO.

Jeffrey Pitrak, Marketing Account Manager, Transient Specialists

KWFinder: Comprehensive Data and SERP Analysis

KWFinder is a preferred keyword-clustering tool. It helps locate and examine keywords for SEO and content marketing endeavors.


First, the tool delivers comprehensive data and analysis to discover valuable keyword opportunities. By inputting a topic, a list of pertinent suggestions can be generated. 

It presents diverse metrics like search volume, cost per click, and trends, enabling the identification of keywords with substantial search volume and low competition.

It features a SERP analysis function that permits the assessment of the highest-ranking pages for a specific keyword. Essential SEO metrics of these pages, including domain authority and more, can be observed. This information enhances understanding of the competition and facilitates the optimization of the content plan accordingly.

Last, KWFinder offers both free and paid plans, with the latter granting access to advanced features and higher search volume limits.

Peter Bryla, Community Manager, ResumeLab

Keyword Cupid: Machine Learning-Driven Clustering

In this 21st century, if you want to boost your online presence, rely on a keyword-cluster tool. Keyword Cupid is the best in the business because it uses machine learning to generate accurate results. This software helps users in building content that is sure to rank on Google.

Faizan Khan, PR and Content Marketing Specialist, Ubuy UK

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