Rankfill

Search Competitor Keywords to Uncover Your Traffic Gaps

You check your analytics and traffic is flat. You're publishing content, you have a real product, your site isn't new — and yet competitors you know are weaker somehow rank for terms you've never even targeted. You Google one of those terms and there they are, sitting on page one. You didn't miss the keyword because it was hard. You missed it because you never knew to look.

That's the gap this article closes.

What It Means to Search Competitor Keywords

"Searching competitor keywords" means finding every search term that sends traffic to a competing site — terms they rank for, terms they're building content around, terms their audience is using to find them. The goal isn't to copy their content. It's to identify where they're capturing organic traffic that your site could be capturing too.

Most sites have hundreds, sometimes thousands, of these gaps. You just can't see them by browsing a competitor's website. You need to look at the keyword data behind it.

The Right Way to Frame This Exercise

Before you open any tool, get clear on what you're actually looking for:

Keywords they rank for that you don't. These are your gaps. They represent traffic you're losing not because you tried and failed, but because you never competed.

Keywords where they rank higher than you. You're in the game but losing. These are worth noting, but they're a different problem than a complete absence.

Keyword clusters that reveal their content strategy. Competitors don't usually rank for random isolated terms. They've built out topical authority in specific areas. The clusters tell you where they've invested and where you haven't.

Start with gaps. That's where the fastest wins are.

How to Actually Do It

Step 1: Identify Your Real Competitors

Your SEO competitors and your business competitors are not always the same. A business competitor sells what you sell. An SEO competitor ranks for the keywords your customers search. Sometimes they overlap. Often they don't.

The fastest way to find SEO competitors: take three or four keywords you already rank for, search them, and note who consistently appears alongside you. Those are your search competitors. You can also use tools like Ahrefs, Semrush, or Moz — enter your domain, navigate to the "Competing Domains" or "Organic Competitors" section, and they'll show you which sites share your keyword space.

List five to ten of them. You'll work through them systematically.

Step 2: Pull Their Keyword Lists

Every major SEO tool has a version of this feature. In Ahrefs it's called "Organic Keywords" under Site Explorer. In Semrush it's "Organic Research." In Moz it's "Top Ranking Keywords." Enter a competitor's domain and export every keyword they rank for in positions 1–20.

Do this for your top three to five competitors. You'll end up with large lists — thousands of rows is normal. Don't panic. You're about to filter them down.

Step 3: Find the Gap

Now you need to subtract your own rankings from theirs. The keywords they rank for that you don't appear for at all — those are your gaps.

In Ahrefs, the "Content Gap" tool does this directly: enter multiple competitor domains and your own, and it returns keywords competitors rank for that you don't. Semrush has a "Keyword Gap" tool that works the same way. If you're working with exported spreadsheets, you can use VLOOKUP or a pivot table to cross-reference the lists manually — it takes longer but the logic is identical.

This is the core of competitor keyword analysis: you're not guessing what to write about, you're reading what's already working for sites in your exact market.

Step 4: Filter for What's Worth Targeting

Your gap list will have junk in it. Brand terms from competitors, terms tied to their specific product names, navigational queries that only make sense for their site. Filter those out.

What you're left with should be prioritized by:

For a deeper process on filtering and scoring these gaps, the keyword competitive analysis guide covers prioritization in more detail.

Step 5: Map Gaps to Content

Now you have a filtered list of keywords competitors rank for that you don't target. Each one either needs:

  1. A new page built specifically for it
  2. An existing page on your site updated to target it
  3. An internal link structure that surfaces an existing page to Google more clearly

Most gaps require option one — you simply don't have the content. Build a spreadsheet: keyword, estimated monthly volume, difficulty score, content type needed, existing page (if any), priority tier. This is your content plan. It came directly from your competitor's traffic data, which means it's grounded in what people actually search, not what you think they might search.

The step-by-step keyword research competitor analysis guide walks through building this kind of plan in detail if you want to go further.

Common Mistakes to Avoid

Targeting only high-volume terms. A keyword with 200 monthly searches that you can rank for in three months beats a 5,000-search keyword you'll never crack. Stack the smaller wins.

Ignoring informational content. Many site owners only want to build "bottom-funnel" pages. But competitors building top-of-funnel content are capturing awareness and building topical authority that compounds over time. The gap analysis will show you this — don't ignore it.

Running the analysis once. Competitors keep publishing. Do this quarterly, or at minimum twice a year. New gaps open constantly.

Confusing ranking with traffic. A keyword in position 11 gets almost no clicks. When you're pulling competitor data, filter for positions 1–10 for realistic traffic estimates — and be even tighter (positions 1–5) for high-value terms.

Scaling This Work

If you're working on a relatively small site, doing this manually in Ahrefs or Semrush is reasonable. Export the data, build the spreadsheet, prioritize the list, start writing.

If your site has significant domain authority and you're trying to map gaps across dozens of competitors and hundreds of keywords simultaneously, a tool like Rankfill can handle the full mapping — competitors identified and scored, every gap surfaced, traffic potential estimated, and a content plan built from it — in about 24 hours.

Either way, the underlying method is the same. The tools change, the logic doesn't.

What to Do Right Now

Pick one competitor. The one you respect most, or the one that consistently outranks you. Open Ahrefs, Semrush, or even a free tool like Ubersuggest. Enter their domain. Pull their top 100 organic keywords. Cross-reference against your own rankings. Find five keywords they rank for that you don't target at all.

Those five keywords are your starting point. Write five pages. Measure what ranks. Then do it again with the next competitor.

That's the whole system. The sites winning in organic search aren't doing something mystical — they've just methodically built content for every keyword their market searches. You can see exactly what that looks like by looking at what your competitors already built.

FAQ

What tools can I use to search competitor keywords for free? Ubersuggest offers limited free competitor keyword data. Google Search Console shows your own rankings but not competitors'. For real depth, Ahrefs and Semrush both offer trial access. Semrush has a free tier with limited daily queries. For serious ongoing work, a paid tool is necessary.

How many competitors should I analyze? Three to five is a practical number. More than that creates diminishing returns unless your market is very fragmented. Focus on the competitors who consistently rank in your keyword space, not just business competitors.

What if I don't have a domain authority high enough to rank for these keywords? Start with lower-difficulty terms. Most gap analyses will surface a mix of competitive and accessible keywords. Filter for difficulty scores your domain can realistically target, build those first, and your authority grows as you accumulate rankings.

How often should I run competitor keyword research? Quarterly is a good cadence for most sites. Competitors publish new content continuously, and new gaps open up. If you're in a fast-moving category, monthly checks on your top two or three competitors make sense.

Is it enough to just look at what keywords competitors rank for, or do I need to read their actual content? Both. The keyword data tells you where to compete. Reading the ranking content tells you what quality level you need to beat it. Before you write, check what's currently ranking for that term and understand why it's there.

Can I target the same keywords as a competitor even if they have more authority than me? Yes, but be strategic. Go after terms where their content is thin, outdated, or poorly matched to the search intent. A weaker domain with a better page beats a stronger domain with a lazy page more often than people assume.