Your competitors are already showing you which keywords bring them customers. Every query they rank for and you do not is a piece of evidence: people search for it, Google thinks it is relevant to businesses like yours, and someone is collecting that traffic. A keyword gap analysis turns that evidence into a prioritised list of opportunities.
Unlike general keyword research, which starts from your own ideas, a gap analysis starts from what is already working in your market. It is one of the fastest ways to find missing pages, underperforming pages and topics you never thought to cover.
In this guide you will learn what a keyword gap analysis is, how it differs from a content gap analysis, how to run one step by step with paid or free tools, and how to decide which gaps are actually worth closing in 2026.
Key Takeaways
- A keyword gap analysis compares the keywords your site ranks for with those of competing domains to find missing and weak keywords.
- Pick search competitors, not just business rivals: the sites that actually rank for your target topics.
- The most useful buckets are "missing" (they rank, you don't), "weak" (you rank lower) and "untapped" (at least one competitor ranks, you don't).
- Filter gaps by intent, business value and realistic difficulty before you create anything.
- Close gaps by improving existing pages first, then creating new pages where no suitable page exists.
What Is a Keyword Gap Analysis?
A keyword gap analysis is a side-by-side comparison of the organic keywords two or more domains rank for. The output shows where your rankings overlap with competitors, where you are behind, and where you are not present at all.
It sits between two related exercises we cover elsewhere. A competitive SEO analysis looks at everything a rival does well, from links to site structure. A content gap analysis looks at whole topics and formats you are missing. A keyword gap analysis is narrower and more data-driven: it works at the level of individual queries and positions, which makes it ideal for building an action list.
The Gap Categories Explained
Most tools sort keywords into similar groups. Semrush's Keyword Gap tool, which compares your domain side by side with several competitors, uses six labels. Its knowledge base defines a "weak" keyword this way:
“keywords where you have a ranking but it is lower than all of your competitors’ rankings.”
— Semrush Knowledge Base, How to use Keyword Gap?
| Category | What it means | Typical action |
|---|---|---|
| Missing | Every competitor ranks; you do not | Highest priority to review: clear proof of demand and relevance |
| Weak | You rank, but below all competitors | Improve the existing page rather than creating a new one |
| Untapped | At least one competitor ranks; you do not | Review for niche opportunities and new angles |
| Strong | You rank above all competitors | Protect: keep pages updated and well linked |
| Shared | Every domain compared ranks | Monitor the battleground terms and positions |
| Unique | Only you rank | Understand why it works and repeat the formula |
Other tools, such as Ahrefs' Content Gap report, use different names for similar ideas. The labels matter less than the logic: separate "create" opportunities from "improve" opportunities.
How to Do a Keyword Gap Analysis: Step by Step
- Define the scope. Decide whether you are analysing the whole domain, one subfolder (for example a blog or a product category) or one market. Set the country and device that match your customers.
- Choose three to five search competitors. Search your main target keywords and note the domains that appear repeatedly. These may include publishers, directories or marketplaces, not just companies you meet in sales calls. Exclude giants like Wikipedia or Amazon unless you genuinely compete with them for the same intent.
- Run the comparison. Enter your domain and the competitors into a gap tool and export the missing, weak and untapped lists.
- Clean the data. Remove competitor brand names, irrelevant products, locations you do not serve and obvious junk queries.
- Tag intent. Label each keyword as informational, commercial, transactional or navigational. Our guide to search intent explains how to check by looking at the results page.
- Group into topics. Cluster variations that a single page could serve. Keyword clustering stops you creating near-duplicate pages.
- Score and prioritise. Rate each cluster on business value, realistic difficulty and the effort to close the gap (see the scoring table below).
- Map to pages. Assign each cluster to an existing URL to improve or a new URL to create, using your keyword map.
- Act and track. Make the changes, then track rankings and Search Console impressions for the target queries over the following months.
How to Prioritise the Gaps You Find
A gap report can easily list thousands of keywords. Most are not worth your time. Score each cluster on four questions:
| Question | High score | Low score |
|---|---|---|
| Would ranking bring customers? | Commercial or transactional intent tied to what you sell | Loosely related informational query |
| Can we realistically compete? | Competitors ranking with modest authority or weak pages | Results dominated by major brands with strong pages |
| Do we already have a relevant page? | Yes, it just needs improving | No, and it would need new expertise or products |
| Is demand stable or growing? | Steady or rising interest | One-off spike or declining topic |
Use keyword difficulty scores as a rough guide, but always open the actual results. For buyer-focused gaps, our posts on commercial investigation keywords and transactional keywords help you judge which terms deserve dedicated pages.
Free Ways to Find Keyword Gaps
Paid gap tools are the quickest option, but you can approximate the analysis without them:
- Manual SERP checks. Search your core topics and list the pages that rank. Note the subtopics and questions they cover that your pages do not.
- Competitor sitemaps and navigation. A rival's category and service structure often reveals entire sections you are missing.
- Search Console. Queries where you get impressions but rank beyond page one are your own "weak" list, straight from Google's data.
- Google Keyword Planner. Entering a competitor's URL in "Discover new keywords" generates keyword ideas based on that site. Our guide to Google Keyword Planner shows how.
- People Also Ask and related searches. These show adjacent questions competitors may be answering.
For a comparison of paid and free options, see our roundup of keyword research tools.
How to Close Keyword Gaps
- Improve before you create. If a page already targets the topic, expand it with the missing subtopics, sharpen the title and headings, and add internal links from related pages.
- Create pages that match the winning format. If the top results are comparison pages, a generic blog post will struggle. Our guides to comparison pages and alternatives pages cover two formats that often appear in gap reports.
- Add something competitors lack. First-hand experience, original data, clearer pricing information or better examples give Google and readers a reason to prefer your page.
- Strengthen authority where needed. If competitors outrank you mainly on links, pair content work with a competitor backlink analysis.
Common Mistakes in Keyword Gap Analysis
- Comparing against the wrong competitors. A national retailer and a local shop rarely share useful gaps.
- Chasing every missing keyword. Volume without relevance produces traffic that never converts.
- Creating one page per keyword. This leads to thin, overlapping pages and keyword cannibalisation.
- Ignoring the weak list. Improving pages that already rank is often faster than building new ones.
- Treating the analysis as a one-off. Competitors publish constantly; repeat the exercise every quarter or two.
- Forgetting SERP features. Some gaps are dominated by AI Overviews, local packs or shopping results, which changes the click potential.
Related Guides
- Keyword Research Tools Compared
- How to Use Google Keyword Planner for SEO
- How to Use Google Trends for SEO and Content
Frequently Asked Questions
What is a keyword gap analysis?
It compares the keywords your domain ranks for with those of competitors, showing keywords you are missing, ranking weakly for or uniquely own.
How is a keyword gap different from a content gap?
A keyword gap works at the level of individual queries and positions. A content gap looks more broadly at topics, formats and questions your site does not cover.
How many competitors should I compare?
Three to five search competitors is usually enough. Choose sites that rank for your target topics, not only your direct business rivals.
Can I do a keyword gap analysis for free?
Yes, roughly. Combine manual results checks, competitor site structures, Search Console data and Keyword Planner ideas from competitor URLs. Paid tools are faster and more complete.
How often should I run a keyword gap analysis?
Every three to six months is a sensible rhythm, or after major site changes, new competitors entering the market or a core update.
Turn Competitor Data Into Your Next Wins
A keyword gap analysis shows you exactly where competitors are earning search visibility that you are not. Choose the right competitors, filter ruthlessly for intent and value, and close gaps by improving existing pages first. If you would like an expert team to run the analysis and build the roadmap, our SEO services and content writing teams can help. Request a quote to get started.
