Competitor Keyword Gap Analysis Step by Step

Why Competitor Keyword Gaps Are the Best Content Opportunities

A competitor keyword gap is a keyword where one or more competitors rank in the top 100 but your site does not appear at all. These gaps are higher-quality opportunities than general keyword research because they represent proven demand -- real traffic flowing to competitors in your space that you are not capturing.

Sites that systematically close keyword gaps typically see 30-50% organic traffic growth within 6-12 months.

Running the Gap Analysis

Ahrefs Content Gap Tool

1. Open Ahrefs Site Explorer and enter your domain
2. Navigate to Content Gap in the left sidebar
3. Add 3-5 SERP competitors (not business competitors) in the comparison fields
4. Set the filter to show keywords where at least 2 competitors rank but your site does not
5. Export the results -- expect 500-5,000+ keywords for most niches

Semrush Keyword Gap Tool

1. Open the Keyword Gap tool under Competitive Research
2. Enter your domain and up to 4 competitors
3. Select "Missing" to find keywords only competitors rank for
4. Select "Weak" to find keywords where competitors rank significantly higher than you
5. Apply the "Top 20" position filter to focus on keywords competitors actually get traffic from

Choosing the Right Competitors

Use SERP competitors, not business competitors. In Ahrefs, the Competing Domains report shows which sites share the most organic keywords with you. In Semrush, the Organic Research competitors tab provides the same data. Pick domains with a similar or slightly higher Domain Rating (DR within 10-15 points of yours) for the most actionable gaps.

Filtering for Actionable Keywords

Raw gap reports are too large to act on. Apply these filters sequentially:

Volume Filter

Remove keywords below 50 monthly searches unless they are high-intent transactional terms. For most sites, the sweet spot is 100-5,000 monthly searches per keyword.

Difficulty Filter

Filter by Keyword Difficulty appropriate to your domain authority. As a guideline: DR 20-30 sites should target KD 0-20. DR 30-50 sites can target KD 0-35. DR 50+ sites can target KD 0-50. Exceeding these ranges requires a strong backlink acquisition strategy for each piece of content.

Intent Filter

Manually review the top 50-100 remaining keywords and remove any that do not match your business offering. A SaaS company should skip informational keywords about topics they do not cover. An ecommerce site should skip purely informational queries where product pages cannot rank.

Existing Coverage Check

Cross-reference gap keywords against your existing content. Some gaps exist because you cover the topic but do not rank -- these need optimization, not new content. Use site:yourdomain.com "keyword" searches to check.

Prioritization Framework

Score each gap keyword on three dimensions:

• Traffic potential (1-3): Based on search volume and expected CTR for achievable positions
• Business relevance (1-3): How closely the keyword relates to your product or service
• Difficulty feasibility (1-3): Whether the KD score is within your domain's realistic reach

Multiply all three scores. Keywords scoring 18-27 go in your first production sprint. Keywords scoring 8-17 are second priority. Below 8, deprioritize or skip.

Execution Strategy

For Missing Keywords (No Existing Page)

Create new content specifically targeting the gap keyword. Match the format and depth of the top-ranking competitor pages. Aim to publish content that is measurably better -- more thorough, more current, or more actionable.

For Weak Keywords (Existing Page Ranks Poorly)

Analyze why the competitor page outranks yours. Common issues include thinner content, fewer internal links, weaker backlink profiles, or intent mismatches. Optimize the existing page rather than creating a competing one.

Measuring Gap Closure

Re-run the gap analysis monthly. Track the total count of "Missing" keywords -- this number should decrease by 10-15% each month if you are publishing consistently. In Semrush Position Tracking, monitor the Share of Voice metric against your competitors to visualize competitive gains over time.