Keyword Gap: Finding Keywords Your Competitors Rank For (and You Don’t)

Keyword Gap is the Semrush tool that compares your domain against competitors and shows you keywords they rank for that you don’t. You enter your domain plus competitor domains, read the gap views, and pick gaps you can realistically serve. HowToSemrush is an independent guide and is not affiliated with or endorsed by Semrush.

Key takeaways

Keyword Gap compares your site against competitors to reveal keywords they rank for and you don’t — plus where you’re weak, strong, or facing untapped demand.
Pick competitors that actually resemble your site — similar topics, similar size. Comparing yourself to a giant produces noise, not a plan.
The gap views are concepts, not permanent labels — Semrush updates its interface, so check the current names in the tool and its help center.
A gap is only an opportunity if you can serve the search intent better than the pages already ranking for it.
Prioritize by relevance first, difficulty second — a relevant, winnable keyword beats a high-volume trophy term you can’t hold.

What Keyword Gap actually does

Most keyword research starts from your own head: you type a seed keyword and explore what comes back. Keyword Gap starts from the opposite direction. It asks, “What are my competitors already ranking for that I’m missing?” and answers with a side-by-side comparison.

Here is the basic shape. You give the tool your domain and up to a few competitor domains. It pulls each domain’s recorded ranking keywords and lays them out so you can see the overlaps and the holes. The holes — keywords competitors rank for and you don’t — are the “gaps.”

Why this matters for a beginner: guessing keywords from scratch is hard because you don’t know what the market actually searches for. Competitors who already rank are a proof-of-demand signal. If three similar sites all rank for a keyword, people are clearly searching for it, and there is clearly a page-shaped hole you could fill — provided you can build a better page.

One honest note: Keyword Gap compares recorded rankings, not promised traffic. A keyword your competitor ranks for might bring them almost nothing — which is why reading and prioritizing the results matters more than running the tool.

Picking the right competitors

The tool lets you enter several competitor domains alongside yours. The instinct is to type the biggest names in your niche. Resist it — at least at first.

A gap against a giant is often a mirage: compare a small blog against a media company and the “missing” list will be enormous but almost entirely unwinnable. Volume of gaps is not the goal; winnable gaps are.

Pick competitors using three filters:

Same topic neighborhood. They write about the same things you do (or want to). A direct topical rival, not a general encyclopedia that happens to rank for one of your terms.
Similar or slightly larger size. Sites a step or two ahead of you are the sweet spot — they prove what is achievable, and their gaps are often realistic for you to close.
Genuinely ranking. Don’t include a domain because you admire it; include it because it actually shows up in search results for your topic. If you never see them in results, the comparison is empty.

Two to four competitors is the practical range — one gives a narrow view, five or more produce a spreadsheet you’ll never finish. You can always run a second comparison later.

Practical tip: if you already know who outranks you, start with them. If you don’t, our guide to competitor analysis in Semrush walks through finding your real search competitors using Domain Overview and Organic Research — worth doing before you ever open Keyword Gap.

Running your first comparison, step by step

Open Keyword Gap. Find it among the competitive research tools in the Semrush sidebar. (Semrush updates its interface — if a label moved, search Semrush’s help center for the current name.)
Enter your domain. Type it as your site resolves — the bare domain usually works. This is the “you” in the comparison.
Enter your competitor domains. Add the two to four rivals you picked in the previous section.
Choose your location. Keyword Gap compares rankings in a specific country database — pick the one matching your audience, since a gap in one market may not exist in another.
Run the comparison. The tool generates the gap report. Depending on the size of the domains, this can take a moment.
Start with the Missing view. This is the discovery view for beginners: keywords competitors rank for and you have no recorded ranking for. The next section explains each view in full.

One note on data: new or very small sites may show few of their own rankings, making some views thin. That’s normal — run the comparison anyway; the Missing view still shows what the neighborhood ranks for.

Reading the gap views

The report organizes keywords into gap views. The concept behind each one:

Missing. Keywords at least one competitor ranks for and you don’t. This is the discovery view — the raw material of the whole exercise.
Weak. Keywords where you rank, but competitors rank higher. You’re in the race but losing. These are often the fastest wins: you already have a page; it needs to be better, not built from nothing.
Strong. Keywords where you outrank the competitors. Your confirmed strengths. Read this view to understand what is already working — and to protect it.
Untapped. Keywords none of the entered domains serve well — demand the neighborhood hasn’t captured yet.

A note on labels: Semrush renames views over time. The concepts above are stable; the exact tab names may not be. If what you see differs, read the view descriptions inside the tool — same comparisons, current wording. Concepts are durable, labels move.

Within each view, you will see the usual keyword columns — volume, difficulty, and intent signals — which you can sort and filter. Don’t try to read every row. In the next section, we shrink the list to the ones worth your time.

Prioritizing gaps like a grown-up

A raw Missing list can run to thousands of keywords. Chasing all of them is how beginners burn out. Run every candidate through four filters, in this order:

1. Relevance: does this keyword belong on your site?
If the keyword has nothing to do with what you do, skip it — even if the volume is tempting. A cooking blog ranking for a plumbing term helps nobody, and readers who bounce teach search engines the page was a mismatch. Relevance is a yes/no gate, not a sliding scale.

2. Intent: can you serve what the searcher wants?
Check the ranking results’ intent: if it’s “buy a product” and you only publish guides, that gap isn’t yours. The honest test — could you build a page that genuinely satisfies the searcher? — decides. Our Keyword Overview guide teaches this judgment call in depth.

3. Difficulty: is this winnable for your site right now?
Check the keyword difficulty signal. A brand-new site shouldn’t open with the hardest terms in the niche. Early wins come from specific, lower-competition keywords where your page can plausibly be the best answer. Harder terms go on a later list, not this quarter’s.

4. Business value: does ranking here help you?
A keyword can pass the first three filters and still be worthless to you — for instance, a term that attracts an audience you’d never serve. Ask what a visitor from this keyword would do next on your site. If the answer is “nothing useful,” deprioritize it.

Work in batches of ten to twenty, marking each: pursue now, pursue later, or skip. You’ll end with a short, honest shortlist instead of a thousand-row fantasy.

Turning gaps into a content plan

A prioritized gap list is research, not a plan. Here is how to convert it:

Group gaps by topic. Several gaps usually cluster around the same subject. One cluster means one strong page (or a small set of pages), not five thin articles. This is where the Keyword Magic Tool helps — feed your gap keywords in as seeds to expand each cluster with variants and questions.
Match clusters to pages. “Weak” maps to existing pages to improve; “Missing” maps to pages to create.
Sequence the work. Start with Weak keywords (improve existing pages — the fastest path), then Missing keywords with low difficulty (new pages with a real shot), then the harder Missing terms.
Set a review rhythm. Competitor rankings shift. Re-run the comparison every few months — quarterly is plenty for most sites — and treat it as a fresh prioritization, not a fresh panic.

Gaps feed the Keyword Magic Tool for expansion, vetting happens in Keyword Overview, and clustering happens in the Keyword Strategy Builder. Research is a pipeline, not a single tool.

Mistakes to avoid

Comparing against giants and calling the result a strategy. A 5,000-row Missing list against a giant is not a content plan. Keep comparisons neighborhood-sized.

Chasing volume, ignoring intent. The highest-volume gap is often the worst fit. A smaller keyword with matching intent brings the right readers; a big one with mismatched intent brings bounces.

Treating every gap as a new article. Some gaps are answered by improving an existing page (especially Weak ones). Building a new thin page when you could strengthen an old one fragments your effort.

Copying the competitor’s angle. The gap tells you the keyword is contested, not how to win it. Winning means serving the intent better — clearer, more complete, more current — not paraphrasing the page that ranks.

Running the tool once and filing the export. Rankings and competitors change. A gap analysis is a snapshot with an expiry date; re-run it on a schedule or it quietly rots.

Frequently asked questions

How many competitor domains should I enter in Keyword Gap?
Two to four is the practical range. One competitor narrows your view too much; five or more produces a report too large to act on. Pick rivals similar in topic and size to your site, run the comparison, and re-run with a different set later if you want a second angle. Quality of competitors beats quantity — one truly comparable rival teaches you more than five mismatched ones.

What does “Missing” mean in the Keyword Gap report?
Missing keywords are ones where at least one entered competitor has a recorded ranking and your domain doesn’t. Think of it as the discovery view: demand your rivals are capturing that you’re absent from. Treat the list as raw material, not a to-do list — every candidate still needs the relevance, intent, difficulty, and value filters before it earns a place in your content plan.

Can Keyword Gap help a brand-new website with no rankings?
Yes, with adjusted expectations. With no rankings of your own, the Weak and Strong views will be thin — normal. The Missing view is still useful: it shows what the neighborhood ranks for, which tells you where the demand is. Use it as market research for your first content, but be extra strict on difficulty — a new site should start with the most specific, least competitive gaps.

Should I target every keyword in the Missing view?
No. A Missing list can contain thousands of terms, and most won’t fit your site, your intent capabilities, or your current authority. Filter ruthlessly: relevance first, intent match second, difficulty third, business value fourth. A shortlist of ten to twenty honest opportunities beats a thousand-row export you’ll never open again. Remember the tool shows recorded rankings, not traffic — a competitor may rank for a term that earns them nothing. Your judgment, not the row count, decides what becomes content.

How often should I re-run a Keyword Gap analysis?
Quarterly is plenty for most sites. Rankings shift, competitors publish, and new gaps appear — but the underlying picture rarely changes week to week. Re-running on a fixed schedule keeps the data fresh without turning research into procrastination. Each re-run is a fresh prioritization exercise: some old gaps will be closed, some new ones will appear, and your shortlist gets an honest refresh.

Your concrete next step

Run one Keyword Gap comparison today against two real competitors. Pull the Missing view, filter the first twenty rows, and write down the five survivors — your first honest shortlist.

HowToSemrush publishes independent educational guides about SEO tools. HowToSemrush is not affiliated with or endorsed by Semrush. Semrush updates its features and interface over time — verify current details on semrush.com before relying on them.