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Keyword Insights vs Rank Math

Keyword Insights logo

Keyword Insights

SEO

AI keyword clustering tool that groups keywords by live SERP overlap

From
On request
Rated
-
Full reviewWebsite
Rank Math logo

Rank Math

SEO

WordPress SEO plugin with a free tier that undercuts Yoast on schema and feature count

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Rank Math has a free tier, so it costs nothing to try first.
  • Each has a real cost: Keyword Insights it has no keyword research or search volume data of its own; keywords must be exported from another tool such as Ahrefs or Search Console first.; Rank Math all paid tiers are annual-only with no monthly option, so evaluating Pro or Business month to month before committing is not possible.
  • They diverge on capability: Keyword Insights covers SERP-based clustering, Rank Math covers Free schema generator.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Keyword Insights and Rank Math actually diverge.

Attributes where Keyword Insights and Rank Math differ
AttributeKeyword InsightsRank Math
Starting priceOn requestFree
Pricing modelPer month by credit volume, with pay-as-you-go availableFreemium, paid tiers billed annually only
Free tierNoYes

Identical on both: platforms (Web), user rating (Not yet rated), category (SEO).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Keyword Insights

  • SERP-based clustering
  • Intent classification
  • Content brief generation
  • Bulk keyword upload
  • Pay-as-you-go credits
  • Competitor content gap analysis

Only in Rank Math

  • Free schema generator
  • Rank tracker
  • AI Link Genius
  • Content AI trial
  • Multi-site management
  • 404 monitor and redirections

What people use each for

The jobs each tool is most often brought in to do.

Keyword Insights

  • A content team building topic clusters for a content calendar from a large exported keyword listnot Rank Math
  • An agency needing intent classification to decide whether a keyword warrants a blog post or a product pagenot Rank Math
  • A team that wants SERP-reality clustering rather than word-embedding-based grouping that can miss what Google actually treats as one topicnot Rank Math
  • A one-off project needing to cluster a single large keyword export without committing to a monthly subscriptionnot Rank Math

Rank Math

  • A WordPress site owner who wants more schema types and keyword optimisation than Yoast's free tier provides, at no costnot Keyword Insights
  • An agency managing dozens of client WordPress sites that wants a per-site-count licence rather than per-site billingnot Keyword Insights
  • A team that wants rank tracking built into the WordPress dashboard rather than as a separate subscriptionnot Keyword Insights
  • A site migrating away from a paid competitor and wanting a free tier competitive enough to not need Pro immediatelynot Keyword Insights

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Keyword Insights

  • It has no keyword research or search volume data of its own; keywords must be exported from another tool such as Ahrefs or Search Console first.
  • SERP-based clustering requires a live Google SERP pull per keyword, which is why it is credit-metered and can get expensive fast on very large keyword lists.
  • The pay-as-you-go credit tier only covers clustering; content briefs and other features require a full subscription, which is easy to miss when comparing the entry price.
  • It has no rank tracking, backlink data or technical crawling, so it is a single-purpose tool that must sit alongside a broader SEO stack.
  • As a small, specialised vendor, its roadmap and support resourcing are thinner than a full suite like Semrush that bundles clustering as one feature among many.

Rank Math

  • All paid tiers are annual-only with no monthly option, so evaluating Pro or Business month to month before committing is not possible.
  • The advertised price is a first-year introductory rate; renewal pricing is roughly 10 to 18 percent higher across every tier, which is easy to miss when comparing sticker prices to Yoast.
  • Switching an established WordPress site to or from Rank Math risks losing accumulated redirect rules and schema configuration if the migration is not done carefully, which discourages later switching regardless of price changes.
  • It is WordPress-only, so any team running a non-WordPress CMS gets nothing from this product at all.
  • The generous free tier depends on upselling Pro and Content AI trials inside the plugin dashboard, which some users find intrusive compared to Yoast's comparatively quieter free experience.

Pricing, plan by plan

Keyword Insights

On request
  • Basic$58/month
    • 10,000 credits a month
    • Keyword clustering and intent classification
    • Content brief generation
  • Professional$99/month
    • 20,000 credits a month
    • All Basic features
    • Higher project and export limits
  • Pay As You Go$7.99/month
    • 1,000 clustering-only credits, no subscription required
    • 7-day trial available for 1 US dollar
    • Other features require a subscription plan

Rank Math

Free
  • FreeFree
    • Unlimited personal websites
    • 18 schema types and unlimited keyword optimisation
    • Google Search Console integration
  • Pro$7.99/month
    • Billed annually, renews at 8.99 euros a month
    • 500 tracked keywords, 840+ schema types
    • AI Link Genius and broken link checker
  • Business$24.99/month
    • Billed annually, renews at 27.99 euros a month
    • 100 client websites, 10,000 tracked keywords
    • Daily Google data fetching, unlimited data retention
  • Agency$54.99/month
    • Billed annually, renews at 64.99 euros a month
    • 500 client websites, 50,000 tracked keywords
    • All Business features, no data preservation limits

Which should you pick?

Choose Keyword Insights if

  • You need serp-based clustering.
  • You also want intent classification.
Keyword Insights review

Choose Rank Math if

  • You need free schema generator.
  • You want to start without paying.
  • You also want rank tracker.
Rank Math review

Questions people ask

Is Keyword Insights or Rank Math better?
Neither clearly leads. Keyword Insights starts at On request and Rank Math at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keyword Insights or Rank Math?
Rank Math has a free tier; the other does not. Paid plans start at On request for Keyword Insights and Free for Rank Math.
Does Keyword Insights or Rank Math run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Rank Math for free?
Yes. Rank Math has a free tier, so you can try it without paying. Keyword Insights starts at On request.
What is Keyword Insights best used for?
Keyword Insights is most often used for a content team building topic clusters for a content calendar from a large exported keyword list, an agency needing intent classification to decide whether a keyword warrants a blog post or a product page, a team that wants serp-reality clustering rather than word-embedding-based grouping that can miss what google actually treats as one topic, a one-off project needing to cluster a single large keyword export without committing to a monthly subscription. Of those, a content team building topic clusters for a content calendar from a large exported keyword list and an agency needing intent classification to decide whether a keyword warrants a blog post or a product page are not what Rank Math is typically brought in for.
What can Keyword Insights do that Rank Math cannot?
Keyword Insights covers SERP-based clustering, Intent classification, Content brief generation, Bulk keyword upload. Rank Math covers Free schema generator, Rank tracker, AI Link Genius, Content AI trial.

Answered from the vendors’ own pages

Keyword Insights: Do I need another SEO tool to use it?

Yes, for keyword data. Keyword Insights clusters and classifies keyword lists you supply; it does not generate keyword lists with search volume itself.

Rank Math: Is Rank Math really free?

Yes, for unlimited personal websites, with 18 schema types and unlimited keyword optimisation at no cost; client sites and rank tracking require a paid tier.

Keyword Insights: How is pricing calculated?

By credits, at 1 credit per keyword clustered, either through a monthly subscription with a credit allowance or a pay-as-you-go top-up.

Rank Math: Can I pay monthly instead of annually?

No. All paid plans are billed annually only; there is no monthly billing option.

Keyword Insights: Is there a free tier?

No permanent free tier; a 7-day trial for 1 US dollar is offered instead.

Rank Math: Does the advertised price stay the same at renewal?

No. Every paid tier renews at a higher rate than the first-year introductory price, by roughly 10 to 18 percent depending on the plan.

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