8 best keyword clustering tools in 2024 (ft. price, free trials, reviews)

Planning the keywords to target as part of a topic cluster can feel like a mammoth task – especially if you’re new to the topic cluster model.

But it doesn’t have to be that difficult.

There are lots of keyword clustering tools out there that can help make topic cluster planning much easier.

In this article we’ll take a look at 8 of the best keyword clustering tools on the market in 2024.

Keyclusters
Keyword Insights
Zenbrief
Keyword Clarity
Semrush
Ahref
SEO AI
Thruuu
Answer The Public

Keyclusters

Keyclusters is a keyword clustering tool. You upload a CSV file of all the keywords you could possibly target for your brand and Keyclusters groups those keywords together into topic clusters for you, and ensures the plan avoids keyword cannibalisation.

Keyclusters reviews

Keyclusters has a G2 rating of 5 out of 5.

Keyclusters pricing

Keyclusters is priced based on the number of keywords you upload, starting at $9 (~£7) for 1,000 keywords and going up to $129 (~£97) for 30,000 keywords.

Does Keyclusters offer a free trial?

Yes! Test Keyclusters out with 100 free credits.

Keyword Insights

Keyword Insights is an SEO tool which supports companies to build topical authority. The platform enables you to generate keyword ideas and then group those ideas into a ready-made topic cluster plan using the keyword clustering feature.

Keyword Insights reviews

Keyword insights has a G2 rating of 4.9 out of 5.

Keyword Insights pricing

Keyword Insights pricing starts at $58 (~£44) per month for 12,000 keyword credits and goes up to $299 (~£225) per month for 100,000 keyword credits.

Does Keyword Insights offer a free trial?

Keyword Insights offers a 4 day trial for $1.

Zenbrief

Zenbrief is a content optimisation tool which enables you to create customised content briefs that are optimised for SEO, and to write the content.

Zenbrief has a free keyword clustering tool – enter your list of keywords and the tool will group them into organised topics for you. It’s free, so it’s fairly basic, but it could come in useful for helping to structure and organise existing keywords into clusters.

Zenbrief reviews

Zenbrief is not currently listed on G2.

Zenbrief pricing

The Zenbrief keyword clustering tool is free. Pricing for Zenbrief as a content writing and optimisation tool starts at $195 (~£147) per month for 30 briefs.

Does Zenbrief offer a free trial?

Zenbrief does not currently offer a free trial for its paid features.

Keyword Clarity

Keyword Clarity is a keyword clustering tool. Import a list of keywords and the tool organises them into ready-made topic cluster plans which can then be exported.

Keyword Clarity reviews

Keyword Clarity is not currently listed on G2.

Keyword Clarity pricing

Keyword Clarity is free to use.

Does Keyword Clarity offer a free trial?

Keyword Clarity is free to use.

Semrush

Semrush is an SEO platform. It has a multitude of features relating to SEO and content marketing, including the Semrush Keyword Strategy Builder which is a great topic cluster tool.

With the Keyword Strategy Builder, you enter the ‘seed keyword’ i.e. the overall topic or parent keyword that you want to target with the cluster, and the tool finds all the possible keywords that you could target, grouped by topic and search intent.

Semrush reviews

Semrush has a G2 rating of 4.5 out of 5.

Semrush pricing

Semrush pricing starts at $140 (~£105) per month (5 projects, 500 keywords to track, 10,000 results per report) and goes up to $500 (~£376) per month (500 projects, 5,000 keywords to track, 500,000 results per report).

Does Semrush offer a free trial?

Yes! Semrush offers a 7 day free trial.

Ahrefs

Ahrefs is a full SEO platform with a multitude of features relating to SEO and content marketing. This includes the Ahrefs Keywords Explorer tool which enables you to enter topic ideas or parent keywords, instantly generate thousands of keyword ideas, cluster them by topic, and see the metrics to understand which have the most potential for ranking.

Ahrefs reviews

Ahrefs has a G2 rating of 4.5 out of 5

Ahrefs pricing

Ahrefs pricing starts at £99 per month (5 projects, 1 user, 500 credits, 750 tracked keywords) and goes up to £359 per month (100 projects, 3 users, unlimited credits, 10,000 tracked keywords).

Does Ahrefs offer a free trial?

Ahrefs offers some functionality for free for website owners via Ahrefs webmaster tools.

SEO AI

SEO AI is an AI-driven SEO tool which helps you to write SEO optimised content, identify gaps that could help you to rank better, and more. SEO AI’s features include a keyword research tool which can be used to develop ideas for keywords to target within your topic cluster.

SEO AI also offers a free topic cluster tool which enables you to enter a topic or parent keyword and generate ideas for keywords to target.

SEO AI reviews

SEO AI is not currently listed on G2.

SEO AI pricing

SEO AI pricing starts at $49 (~£37) per month (10 blogs, 100 tracked keywords, 1 user) and goes up to $399 (~£300) per month (250 blogs, 1,000 tracked keywords, 5 users).

Does SEO AI offer a free trial?

Yes! SEO AI offers a 7 day free trial.

Thruuu

Thruuu is an SEO platform with features including a keyword clustering tool. You simply upload a list of keywords and the Thruuu keyword clustering tool will group them to create the most effective topic cluster plan based on SEO data. Thruuu can then also be used to write SEO optimised pillar pages and cluster content for the topic cluster.

Thruuu reviews

Thruuu is not currently listed on G2.

Thruuu pricing

Thruuu pricing starts at $13 (~£10) per month for 75 credits (1500 keywords) and goes up to $66 (~£50) per month for 700 credits (14,000 keywords).

Does Thruuu offer a free trial?

Yes! Thruuu offers 10 credits for free – the equivalent of one topic cluster containing 500 keywords.

Answer The Public

Answer The Public is a search listening tool which enables you to understand all of the search terms and questions users are putting into search engines with relation to the subject area of your topic cluster. It presents this information visually which can be very helpful when planning a topic cluster, as well as listing out different types of search terms e.g. questions.

Answer The Public reviews

Answer The Public has a G2 rating of 4.5 out of 5.

Answer The Public pricing

Answer The Public pricing starts at £11 per month (1 user, 100 searches per day) and goes up to £199 per month (unlimited users, unlimited searches).

Does Answer The Public offer a free trial?

Yes! Answer The Public offer 3 free searches per day.

💪 Looking for support to plan and execute topic clusters for your website?

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