Rankfill

Competitor Keyword Research: Find Every Gap They Exploit

You publish a post. It sits on page three. Meanwhile, a competitor you've never heard of ranks first for the exact term you wanted — and has been ranking there for two years. You check their site. It's not better than yours. The writing is mediocre. Their product is roughly equivalent. But they're getting the traffic, and you're not.

That gap almost always comes down to one thing: they figured out which keywords to target, and you're still guessing.

Competitor keyword research is the process of finding exactly what search terms are driving traffic to your rivals — then deciding which of those terms you can go after. Done right, it removes most of the guesswork from content strategy. Done wrong (or not done at all), you spend months writing content that never ranks because you picked topics based on intuition rather than evidence.

This guide walks through the full process.

Why Your Own Keyword Research Isn't Enough

Most people start keyword research by brainstorming topics, typing them into a tool, and filtering by search volume. That tells you what people search for. It doesn't tell you what's actually working in your specific market.

Your competitors have already run that experiment. They've published, tested, earned backlinks, and built topical authority around certain keyword clusters. Their traffic data is a map of what works. Ignoring it means you're doing the research from scratch when someone else already did it for you.

The other problem with starting from scratch: you tend to overestimate how competitive a space is in some areas and underestimate it in others. A competitor's keyword profile shows you the actual distribution — where the real volume lives, which terms convert (you can infer this from what competitors prioritize with landing pages vs. blog posts), and where the gaps are that nobody has filled yet.

Step 1: Identify Your Real Competitors

Your search competitors are not necessarily your business competitors. A direct competitor in your industry might have a terrible website and rank for nothing. A tangentially related site might dominate ten keywords you desperately want.

Start by searching for three to five of your target keywords and noting who shows up consistently on page one. These are your search competitors. List ten to fifteen of them.

Then separate them into tiers:

You'll approach each tier differently. Direct competitors tell you what's working for businesses like yours. Indirect competitors (especially content-heavy sites) reveal the full keyword landscape. Aspirational competitors show you what the ceiling looks like.

Step 2: Pull Their Keyword Data

You need a tool for this. The major options:

Ahrefs — The most complete keyword database. Enter a competitor's domain, go to "Organic keywords," and you see every term they rank for, their position, estimated traffic, and the URL that ranks. Export this. It's the most useful raw material you'll work with.

Semrush — Similar capability. Strong on position tracking and the "Keyword Gap" tool, which lets you compare up to five domains simultaneously and see which keywords one domain ranks for that yours doesn't.

Moz — Less comprehensive than the above two but useful for smaller budgets. The "Top Pages" report shows which pages drive the most traffic, which helps you reverse-engineer their content strategy.

Google Search Console — Free, but only shows your own data. Use it to see what you currently rank for so you can identify the delta when you compare against competitors.

For each competitor, export their full keyword list. You're looking for:

Step 3: Run a Keyword Gap Analysis

A keyword gap is any term a competitor ranks for that you don't. Finding gaps is the core deliverable of competitor keyword research.

In Semrush, the Keyword Gap tool does this automatically. You enter your domain and up to four competitors, and it shows you:

In Ahrefs, you can do this manually by exporting competitor keyword lists and running a VLOOKUP (or using the Content Gap tool under Site Explorer).

The missing and untapped categories are your starting point. For a deeper look at structuring this analysis, Keyword Competitive Analysis: How to Find Ranking Gaps walks through the methodology in detail.

Step 4: Filter for Winnable Keywords

A raw gap list might contain thousands of terms. Most of them aren't worth pursuing — at least not yet. Filter aggressively.

Filter 1: Search Intent Match

Does the keyword match what you actually offer? If a competitor ranks for "what is project management software" and you sell project management software, that's worth pursuing. If they rank for "project management certification exam tips" and you're a SaaS tool, that's probably not your audience.

Categorize by intent:

Match intent to your content capabilities and goals. Transactional terms drive direct revenue. Informational terms build authority and capture early-funnel traffic.

Filter 2: Keyword Difficulty vs. Your Domain Authority

A keyword with difficulty 70/100 when your site has a Domain Rating of 25 is not a near-term opportunity. Focus on keywords where your domain authority is competitive. If you're a smaller site, prioritize:

Filter 3: Topical Clusters

Don't pick keywords in isolation. Group related terms into clusters. A cluster might be "project management templates" — with a pillar page and supporting posts on specific template types. Targeting a cluster builds topical authority faster than targeting scattered individual terms.

Filter 4: Business Value

Traffic that doesn't convert is vanity. Ask: if we ranked for this and got 500 visitors a month, would any of them become customers? Keywords that attract your buyer at any stage of the funnel have business value. Keywords that attract people with no connection to your offer don't.

Step 5: Analyze Their Best-Performing Pages

Keywords tell you what to target. Competitors' top pages tell you how to beat them.

For each priority keyword you identify, look at the page that currently ranks. Ask:

The goal isn't to copy the ranking page. It's to understand what the search engine is rewarding, then create something that serves the searcher better. Competitor Keyword Analysis: Uncover What You're Missing goes deeper on interpreting what competitor pages reveal about ranking requirements.

Step 6: Map Gaps to Content Types

Once you have your filtered keyword list, you're building a content plan. Different keywords warrant different content types:

Keyword Type Best Content Format
"How to X" Step-by-step guide with clear structure
"Best X for Y" Comparison post with genuine evaluation
"X vs Y" Direct comparison with honest assessment
"X pricing / cost" Transparent pricing or cost breakdown post
"What is X" Clear explainer, often with examples
"[Tool/Product] alternatives" Alternatives roundup (high commercial intent)

Don't force one format. Let the intent of the keyword dictate the format. A searcher asking "how to export Notion to PDF" wants a quick answer, not a 3,000-word essay. A searcher asking "best CRM for small business" wants depth, comparison, and evidence.

Step 7: Prioritize and Sequence

You can't publish everything at once. Build a sequence based on:

  1. Quick wins first: Keywords where you're already ranking 11–30 and can push into page one with a content update or link push
  2. High-value clusters next: Build out topical clusters systematically so you build authority in a theme before jumping to another
  3. Long-tail before head terms: Rank for the easier long-tail variations first. Those rankings build authority that eventually helps you compete for the head terms.

For a step-by-step sequencing process, Keyword Research Competitor Analysis: A Step-by-Step Guide covers how to prioritize across a large gap list.

Step 8: Track and Adjust

Competitor keyword research isn't a one-time project. Competitors publish new content. New players enter your space. Search rankings shift constantly.

Set a recurring schedule:

If you find a competitor suddenly ranking for twenty new keywords in a cluster you haven't covered, that's a signal — they may have identified something about buyer behavior you haven't addressed yet.

Scaling the Process

The process above is doable manually if you're a solo operator with one site and a few dozen target keywords. It gets unwieldy fast when you have a large site, multiple product lines, or dozens of competitors to track.

At scale, you have a few options: hire an SEO analyst whose job is to run this process continuously, use tools like Ahrefs or Semrush with automated alerts and reporting, or use a service that maps the entire competitive landscape for you. Rankfill, for example, identifies every keyword your competitors are capturing that your site is missing and delivers a prioritized content plan — useful if you want the full picture without building the analysis infrastructure yourself.

For most sites, the combination of a solid tool and a quarterly review cadence is sufficient. The discipline of doing it consistently matters more than the sophistication of your setup.

Common Mistakes That Waste the Work

Chasing volume without checking intent. A 10,000-search-per-month keyword that doesn't match what your site offers is worth zero.

Targeting the same keywords as the biggest competitor in your space. If a site with DR 85 and 200 referring domains owns a keyword, you're not displacing them this quarter. Find their blind spots — lower-competition terms they've ignored.

Publishing once and forgetting it. A post that hits position 15 isn't a failure. It's a starting point. Update it, build links to it, and it often moves to page one over time.

Ignoring SERP features. If a keyword is dominated by featured snippets, videos, or local packs, a standard blog post may never reach the visibility you want. Check the SERP before you commit to a format.

Treating gaps as automatic opportunities. If five competitors don't rank for a term, it might mean the term has no real search demand (data discrepancies in tools are common at low volumes) or that everyone has tried and failed. Verify before investing.

If you want to go deeper on execution — specifically how to read what you find and turn it into actual rankings — How to Find and Target Your Competitor Keywords and How to See Competitor Keywords and Rank for Them Too both cover the tactical side in more detail.

FAQ

How many competitors should I analyze? Five to ten is usually enough for a thorough picture. More than that and you start getting diminishing returns — the same keywords keep appearing. Focus on the competitors who consistently appear on page one for your target terms, not just anyone in your industry.

Do I need a paid tool, or can I do this free? You can do limited analysis free with Google Search Console (for your own data) and limited lookups in Ahrefs or Semrush's free tiers. For a complete picture — exporting full keyword lists, running gap analyses — you need a paid tool. Ahrefs starts around $99/month. If you're serious about SEO, it pays for itself quickly.

What if my competitors are massive sites with huge authority? Don't try to match them across their full keyword profile. Look for their gaps — topics they haven't covered, long-tail variations they've ignored, angles where their content is thin or outdated. Competing on the edges of a large competitor's territory is usually more productive than frontal assault on their core keywords.

How long does it take to see results after targeting competitor keywords? For a new piece of content on a competitive term: three to six months before you see meaningful ranking movement on a healthy domain. For content updates to pages already in positions 11–30: sometimes weeks. Set expectations accordingly and track consistently.

Should I target keywords my competitor ranks for even if I don't have the same product features? Only if the searcher's need is something you can genuinely address. If a competitor ranks for a feature you don't have, targeting that keyword will frustrate visitors and hurt your conversion rate. Target the keywords where you can actually deliver what the searcher is looking for.

What's the difference between competitor keyword research and regular keyword research? Regular keyword research starts from your ideas or a seed topic and expands outward. Competitor keyword research starts from proven traffic — terms already driving visitors to real sites in your space. The second approach is faster and has a higher hit rate because you're building on validated demand rather than predictions.

How do I know which competitor keywords actually convert, not just drive traffic? You can't see their conversion data. But you can infer it from their content investment: if a competitor has a highly polished, regularly updated page targeting a specific keyword, they're probably getting ROI from it. Terms they've built dedicated landing pages around (rather than blog posts) almost always have higher commercial intent.