If your competitors are pulling in organic traffic that should be yours, a keyword gap analysis is the fastest way to find out exactly which queries you’re missing. It tells you what your rivals rank for, what you don’t, and where the easiest wins are hiding.
In this guide, I’ll walk you through a complete competitor keyword gap analysis using both Ahrefs and Semrush, plus a prioritization framework based on traffic potential and ranking difficulty so you act on the right keywords first.
What Is a Keyword Gap Analysis?
A keyword gap analysis compares your website’s keyword profile against one or more competitors to surface the queries they rank for that you don’t. The goal isn’t to copy their list; it’s to identify relevant gaps you can realistically close, ranked by ROI.
A solid gap analysis answers three questions:
- Which keywords are my competitors winning that I’m not?
- Which of those keywords are worth targeting?
- What content do I need to create or update to rank for them?
Why Most Keyword Gap Analyses Fail
Most tutorials hand you a giant CSV and call it done. The real work is filtering. Without prioritization, you’ll waste months chasing high-volume keywords you can’t realistically rank for. Below, every step is built around filtering for winnable, valuable opportunities.
How to Do a Keyword Gap Analysis in 6 Steps
Step 1: Identify Your Real SEO Competitors
Your business competitors aren’t always your SEO competitors. Focus on domains that rank for the same keywords you’re targeting.
In Ahrefs:
- Open Site Explorer and enter your domain.
- Go to Organic Competitors in the left menu.
- Pick 3 to 5 domains with similar size and keyword overlap.
In Semrush:
- Open Domain Overview and enter your domain.
- Scroll to Main Organic Competitors.
- Select competitors with high common keywords and authority within reach.
Tip: Mix one aspirational competitor (bigger than you) with two or three of similar size. The aspirational one shows future opportunities; the peers show realistic wins.
Step 2: Run the Gap Report
Using Ahrefs Content Gap:
- Go to Site Explorer > Content Gap.
- Add your competitors in the top fields.
- Add your domain in the bottom field with “Doesn’t rank for any of the keywords”.
- Set intersection to at least 2 targets to filter out random one-offs.
Using Semrush Keyword Gap:
- Open the Keyword Gap tool.
- Enter your domain and up to 4 competitors.
- Select Missing to see keywords all competitors rank for but you don’t.
- Then check Weak to find keywords you rank poorly for but competitors rank well for.
Step 3: Apply Smart Filters Before Exporting
This is where most people skip and regret it. Apply these filters directly in the tool before exporting anything.
| Filter | Recommended Range | Why |
|---|---|---|
| Search Volume | 100 to 10,000 | Cuts out noise and unrealistic giants |
| Keyword Difficulty (KD) | Below 40 (newer sites) / Below 60 (established) | Realistic ranking targets |
| Competitor Position | Top 20 | Removes accidental rankings |
| Word Count | 2+ words | Long-tail = better intent and lower KD |
| Exclude Branded | Add competitor brand names as negative | Brand queries can’t be stolen |
Step 4: Cluster Keywords by Intent and Topic
Don’t write one article per keyword. Group them.
- Informational: “how to”, “what is”, “guide”, “examples” – target with blog content
- Commercial: “best”, “top”, “vs”, “review” – target with comparison pages
- Transactional: “buy”, “pricing”, “tool”, “software” – target with landing pages
- Navigational: branded queries – usually skip unless you have a comparison angle
A free way to cluster fast: paste your filtered list into a spreadsheet, sort alphabetically, and group queries that share head terms. Tools like Keyword Insights or the clustering inside Semrush speed this up.
Step 5: Prioritize With a Traffic Potential Score
Volume alone lies. Use this simple priority formula:
Priority Score = (Search Volume x Avg. CTR estimate) / Keyword Difficulty
Or, even simpler, sort your filtered keyword list by these tiers:
| Tier | Criteria | Action |
|---|---|---|
| Quick Wins | KD < 25, Volume > 200, you already rank 11-30 | Update existing pages first |
| Strategic | KD 25-50, strong intent match | Create new content this quarter |
| Long Game | KD 50+, high volume | Build pillar content with link support |
| Skip | Irrelevant intent or branded | Remove from list |
Step 6: Audit the SERP Before You Write
Before producing any content, manually open the top 5 results for each priority keyword and check:
- Content format: listicle, guide, tool, video?
- Search intent match: does Google reward your planned format?
- Domain strength: if all top 10 are DR 80+, downgrade priority
- SERP features: featured snippets, People Also Ask, video carousels you can target
This 5-minute check prevents you from writing content Google will never rank.
Ahrefs vs Semrush for Keyword Gap Analysis
Both tools work well. Here’s how they compare specifically for gap analysis in 2026:
| Feature | Ahrefs | Semrush |
|---|---|---|
| Tool name | Content Gap | Keyword Gap |
| Max competitors | 10 | 5 |
| Best filter UX | Stronger intersection logic | Cleaner Missing/Weak/Untapped views |
| Difficulty metric | KD (link-based) | KD% (composite) |
| Export limits | Higher on most plans | Tied to plan tier |
Our take: Use Semrush if you want a faster Missing vs Weak split. Use Ahrefs if you want deeper intersection logic and more competitors in one view. If you only have one, either gets the job done.
Free Alternatives Worth Mentioning
If you can’t justify a paid tool yet:
- Google Search Console: Pull your existing impressions in positions 11-30. These are your fastest wins.
- Mangools KWFinder: Has a lightweight gap feature on lower-cost plans.
- Ubersuggest: Limited but free daily searches.
Common Mistakes to Avoid
- Comparing yourself to giants 50x your size
- Ignoring search intent and writing the wrong content format
- Creating new pages when updating existing ones would rank faster
- Chasing volume instead of business relevance
- Forgetting to track results – always tag gap-driven content in your analytics
FAQ
How often should I run a keyword gap analysis?
Once per quarter is enough for most sites. Run it more often if you’re in a fast-moving niche or after major Google updates.
What are the 4 steps of gap analysis?
In SEO terms: identify competitors, pull their keywords, filter by relevance and difficulty, then prioritize by traffic potential. Some frameworks expand to 6 or 7 steps by adding clustering and SERP audits, as we did above.
What are gap keywords?
Gap keywords are queries your competitors rank for in the top results that your website doesn’t rank for at all, or ranks too low to get traffic.
Can I do keyword gap analysis for free?
Yes, partially. Google Search Console plus a free tier of Ubersuggest or Mangools can surface basic gaps. For thorough analysis with reliable difficulty scores, paid tools deliver far better ROI.
How many keywords should I target from my gap list?
Start with 10 to 20 prioritized keywords per quarter. It’s better to fully cover a small cluster than to spread thin across 100 unrelated terms.
Final Thoughts
A keyword gap analysis is only as valuable as the filtering and prioritization that follow. Pull the data with Ahrefs or Semrush, but spend most of your time on Steps 3 to 6. That’s where the real SEO wins live, not in the size of your CSV export.
Ready to turn those gap keywords into rankings? Pair this analysis with quality backlinks from DigBacklink to give your new content the authority push it needs to actually compete.