How to Do a Content Gap Analysis (Step-by-Step)

What is a content gap analysis?

A content gap analysis is the process of finding topics, keywords, and entities your competitors rank for that you don't cover — or don't cover well enough. The "gap" is the difference between what your audience is searching for and what your site currently provides.

It's one of the highest-ROI activities in SEO because it tells you exactly where to invest your content effort. Instead of guessing what to write, you're filling proven demand that your competitors have already validated.

Three types of content gaps

1. Keyword gaps

Keywords your competitors rank for in positions 1–10 that you either don't rank for or rank outside the top 20. These represent direct opportunities where there's proven search demand and your competitors have demonstrated it's achievable.

2. Topic gaps

Broader subject areas your competitors cover in depth that you haven't addressed at all. A competitor might have a full "SEO for e-commerce" section with ten interlinked articles while you have none — that's a topic gap, not just a keyword gap.

3. Entity gaps

Specific entities — people, tools, concepts, organisations — that an authoritative resource on your topic would naturally cover. If your article on "content marketing tools" doesn't mention HubSpot, Ahrefs, or Semrush, AI models and Google may judge it as incomplete.

Step-by-step content gap analysis process

Step 1: Define your comparison set

Choose 3–5 competitors to analyse. These should be:

• Direct search competitors — sites that consistently appear in SERPs for your target keywords, even if they're not business competitors
• Similar domain authority — sites in a comparable range to yours (±20 DA points) are more useful benchmarks than major publications
• Focused on the same audience — a site writing for CMOs and one writing for solo bloggers have different content strategies even if they cover similar topics

Step 2: Map the competitor content landscape

For each competitor, identify:

• Their top-performing pages by estimated organic traffic
• The keyword clusters those pages target
• Topic categories they cover consistently
• The content types performing best (guides, comparison pages, case studies, tools)

Step 3: Audit your own content

Before comparing, know what you have. Export all your indexed pages and tag them by topic. Look for:

• Topics with thin coverage (one short article vs. a competitor's in-depth hub)
• High-priority keywords where you rank positions 11–20 (close to the first page — worth updating)
• Content that's outdated or hasn't been touched in 18+ months

Step 4: Identify the gaps

Compare your content map against your competitors'. The gaps fall into three buckets:

• Not covered at all — topics competitors rank for that you have zero content on
• Covered but thin — you have an article but it's 500 words vs. a competitor's 3,000-word comprehensive guide
• Missing entities — your content exists but doesn't cover the key concepts, tools, or references that would make it complete

Step 5: Prioritise by opportunity

Not every gap is worth filling. Prioritise based on:

• Search volume — higher volume gaps first
• Keyword difficulty — gaps where competitors ranking have similar or lower authority to yours
• Business relevance — topics that attract your target customer, not just any traffic
• Content investment required — quick wins (adding entities to existing articles) vs. large investments (building a new content hub)

How to fill the gaps efficiently

Once you've identified the gaps, there are three ways to close them:

1. Update existing content — add missing entities, expand thin sections, add FAQ content. Often delivers faster results than creating new pages.
2. Create net-new content — for topics you have zero coverage on. Plan these as part of a topical cluster, not standalone articles.
3. Build content hubs — for large topic gaps, create a pillar page that links to multiple supporting articles. This builds topical authority faster than individual disconnected articles.

Automate the analysis

Manual content gap analysis is time-consuming. Optmizly's Content Gap tool analyses your content against your topic area and surfaces specific gaps — missing entities, uncovered subtopics, and competitor content themes — in under a minute. Use it after running a content analysis to turn your score breakdown into a specific action list.

How often to run a content gap analysis

Content gaps change as competitors publish new content and search trends shift. A quarterly analysis is sufficient for most sites. If you're in a fast-moving niche (AI, finance, health), monthly makes sense for your highest-priority topic clusters.

The bottom line

Content gap analysis turns "what should I write?" from a guessing game into a data-driven process. The sites growing fastest in organic search are the ones that systematically identify and fill gaps rather than publishing random articles based on gut feel. Start with your three most important topic areas, find the five biggest gaps in each, and work through them in priority order.