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October 13, 2026London, UK
Knowledge Base
Semrush Toolkits
SEO
On Page SEO Checker
What are SEO Idea Units?

What are SEO Idea Units?

SEO Idea Units are limits for On Page SEO Checker in the SEO Toolkit.

On Page SEO Checker pairs keywords with your site's landing pages to generate recommendations to improve the SEO of the pages. Whenever you pair a keyword with a landing page, it costs one unit. If you pair two keywords to a landing page, it will cost two units.

If you have set 100 keywords in On Page SEO Checker and will analyze these ten times during one paid month, it would require 1000 units.

The general rule to remember is that one keyword entered = one SEO Idea unit.

Limits 

The limits for each account level are:

  • No SEO Toolkit: 10 units
  • Pro SEO Toolkit: 500
  • Guru SEO Toolkit: 800
  • Business SEO Toolkit: 2,000

All SEO Idea Unit limits renew on the 1st day of every month.

What can I do without the SEO Toolkit?

Even if you're not subscribed to the SEO Toolkit, you are granted 10 SEO Idea units. This limit will be for the lifetime of your account and will not refresh monthly.

Therefore, without the SEO Toolkit, you can use all 10 SEO Idea Units by tracking 10 keyword-page optimizations with On-Page SEO Checker.

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