Topic Clusters & Pillar Pages: Build Topical Authority
Modern SEO is won with topical authority, not single pages. Learn the pillar-and-cluster model.
Read article →How it works
- Enter your page URL and a competitor's page URL (for example two articles on the same topic).
- The tool fetches both pages and extracts their key terms and phrases from the live HTML.
- It compares the two sets to find terms the competitor uses that your page does not.
- You get a prioritized gap list — the words and topics to add to close the difference.
What it shows
- Missing keywords — terms the competitor covers but your page omits.
- Shared terms — topics you both cover, confirming common ground.
- Your unique terms — words only your page uses, showing your angle.
- Frequency signals — how often each gap term appears on their page.
- Phrase-level gaps — multi-word terms, not just single keywords.
- Coverage overview — how much topical overlap the two pages share.
Common use cases
- Improving an existing page — add the subtopics a top competitor covers.
- Competitive research — understand why a rival page outranks yours.
- Content refresh — find what to expand when updating older posts.
- Briefing writers — give a clear list of terms a draft must include.
Example
Compare your email marketing guide against a higher-ranking competitor and the tool might flag missing terms like segmentation, deliverability and A/B testing — three sections to add so your page covers the topic as fully as theirs.
Frequently asked questions
Is the Content Gap tool free?
Yes — completely free with no signup and no limits. Compare as many page pairs as you need.
Does it use real page data?
Yes. The tool fetches and parses both live pages, so the gaps reflect the actual content on each URL right now — nothing is estimated.
How do I use the gap list?
Add the missing terms where they fit naturally, then check structure with the On-Page SEO Checker (Keyword) tool. Our content refresh guide explains how to update pages without losing rankings.