Content Gap Analysis in Ahrefs: The 2026 Step-by-Step Tutorial

Introduction: Why Most Ahrefs Content Gap Tutorials Stop Too Early

Search for a guide on content gap analysis Ahrefs users can follow, and page one is dominated by the same formula: enter three competitors, click a button, export a list. Those tutorials get readers roughly 80% of the way there. The remaining 20% is where they fall short: the strategic decisions that determine whether the exported list becomes a growth plan or a forgotten spreadsheet.

Ahrefs’ own Academy grounds the tool in a simple definition: “Content Gap is our competitive analysis tool that lets you see keywords which your competitors’ websites rank for, but yours doesn’t.”

That definition is accurate, but it says nothing about how to choose competitors, which analysis mode to run, or how to interpret what comes back. This tutorial covers three things most guides skip:

1. Domain-level vs. URL-level use cases, and why they solve different problems.
2. Competitor selection strategy, including the Competing Domains report and the 2 to 5 competitor sweet spot.
3. The four types of content gaps, a framework for interpreting results correctly.

What follows is a mechanically accurate, step-by-step walkthrough, plus a clear-eyed look at where the tool’s job ends.

What the Ahrefs Content Gap Tool Actually Does

The Ahrefs blog defines the broader practice plainly: “A content gap analysis is the process of finding topics your competitors have covered but you haven’t.” The Content Gap tool is Ahrefs’ mechanism for doing that at scale.

It lives inside Site Explorer, under the Competitive Analysis umbrella. Its strength comes from data volume: Ahrefs’ keyword index contains 28.7 billion keywords, sourced from 217 global locations and 10 search engines.

It is important to be precise about what the tool is. Ahrefs Content Gap is fundamentally a keyword and backlink intelligence tool. It is not an AI-citation tracker, and it is not a content-creation tool. That distinction matters later, when its limitations come into focus.

How the Engine Works Under the Hood

The mechanism is straightforward. Ahrefs cross-references each entered site’s full set of ranking keywords against the target domain’s set. Any keyword that appears in a competitor’s ranking profile but not in the target domain’s profile is surfaced as an “opportunity.”

This is purely a ranking-keyword comparison. The tool has no concept of content quality, intent match, or visibility in AI engines. It only knows indexed SERP positions.

Where to Find It in Ahrefs (2026 Interface)

The navigation path is:

Site Explorer → Competitive Analysis → confirm the mode toggle is set to “Keywords.”

If a user doesn’t have a competitor list ready, Ahrefs will auto-suggest competing domains. That is a convenience, not a strategy. Relying on auto-suggestions without scrutiny is one of the most common ways the analysis goes wrong, as covered in the competitor selection section below.

Domain-Level vs. URL-Level Gap Analysis: Two Different Jobs, Not One

This is the first major distinction most tutorials blur together. The Content Gap tool can answer two very different questions:

• Domain-level analysis finds entirely new topics and pages to create.
• URL-level analysis audits an existing page for missing depth and subtopics.

Choosing the wrong mode wastes the entire exercise. Running a domain-level comparison when the real problem is one underperforming page produces thousands of irrelevant keywords and no clear fix.

Domain-Level Analysis: Finding New Topics to Cover

Domain-level analysis compares entire sites. It reveals keyword clusters a competitor owns that the target domain hasn’t addressed at all.

Best for:

• Content calendar planning
• Scoping new site sections
• Growth-stage businesses building out a content library, especially lean marketing teams of one to five people who need to prioritize carefully

URL-Level Analysis: Auditing a Single Page’s Depth

Ahrefs explicitly supports this second use case. When a page on a site “isn’t performing to its potential,” the Content Gap tool can analyze specific URLs to find topic gaps, surfacing ideas for adding depth and making the content more comprehensive.

The comparison happens at the domain level by default, but Ahrefs allows users to narrow it to specific competing URLs rather than whole sites.

Best for:

• Refreshing an underperforming cornerstone page
• Closing comprehensiveness gaps against a competitor’s single superior page

Which Mode to Run First?

A simple decision rule applies:

• Missing whole topics? Start with domain-level analysis.
• A specific page underperforms despite topical relevance? Go URL-level.

For a full-site audit, run both in sequence: domain-level for ideation, then URL-level on the top 10 to 20 existing pages to find depth gaps.

Step-by-Step: Running a Domain-Level Content Gap Analysis

The following steps reflect the core workflow in the 2026 interface.

Step 1: Open Competitive Analysis and Confirm “Keywords” Mode

From Site Explorer, open Competitive Analysis. Before entering anything, confirm the comparison mode is set to Keywords. The tool can also compare other data types, so this check prevents running the wrong report.

Step 2: Enter the Target Domain Plus Competing Domains

Enter the target domain in the first field and competing domains in the fields below. Ahrefs’ official walkthrough suggests one to three competing domains to start, and the tool supports up to 10 comparison domains.

The mechanical limit is 10, but the strategic number is lower. Competitor selection is covered in depth in its own section below.

Step 3: Click “Show Keyword Opportunities”

Clicking Show keyword opportunities populates a list of all keywords the competitors rank for that the target domain does not.

Expect volume. A first run often returns hundreds or even thousands of keywords. This is normal, not an error. The raw list should not be acted on yet.

Step 4: Apply the “Main Positions Only” Toggle

Switch on the Main positions only toggle. According to Ahrefs, this filters out rankings in alternative SERP features such as image packs, sitelinks, and carousels. Those placements rarely represent genuine content opportunities.

This toggle should be on by default for cleaner, more actionable data.

Step 5: Filter by Volume, Keyword Difficulty, CPC, and Word Count

Ahrefs offers extensive filters:

• Search volume
• Keyword Difficulty (KD)
• CPC
• Keyword word count (useful for isolating long-tail queries)
• Include/exclude phrase filters (useful for removing branded terms or irrelevant product categories)

A practical heuristic: start with moderate search volume and low-to-mid KD. This surfaces the fastest realistic wins before chasing high-volume head terms that may take months to rank for.

Step-by-Step: Running a URL-Level Content Gap Analysis

This is the second workflow, and it is the one most competing tutorials skip entirely.

When to Switch to URL Mode

URL-level analysis is the right choice when:

• A page ranks but underperforms its potential
• Traffic to a page has plateaued
• A competitor’s single page consistently outranks the target page despite similar domain authority

Entering and Interpreting URL-Level Results

Mechanics: Instead of entering whole domains, enter the specific page URL to be audited and the competing page URLs. This isolates keyword gaps tied to those exact pages rather than the entire site.

Reading the results: Look for depth signals, including:

• Missing subtopics the competing page addresses
• Related questions the competitor ranks for
• Supporting keywords that indicate broader coverage

Practical output: These results become a content brief for expanding or rewriting the existing page. They are not a prompt for a brand-new article. Creating a separate piece would split relevance and risk cannibalizing the original page.

Competitor Selection Strategy: The Step Everyone Skips

Competitor selection is the single biggest quality lever in the entire process. Poor competitor inputs produce a poor keyword list, no matter how carefully the filters are applied afterward.

Ahrefs allows up to 10 comparison domains, but more does not mean better. Including too many pulls in a wide mix of unrelated keyword intents and topic clusters.

Search Competitors vs. Business Competitors

These two lists frequently differ:

• Business competitors are the companies that compete for the same customers.
• Search competitors are the sites that actually outrank the target domain in the SERPs.

Consider the logic. A national brand may be a direct business competitor but irrelevant in search if it doesn’t rank for niche terms. Meanwhile, a niche blog with zero sales overlap may be a critical search competitor because it owns the informational queries the target audience searches for.

Using Ahrefs’ Competing Domains Report to Build the List

Inside Site Explorer, the Competing Domains report surfaces sites with the highest keyword overlap with the target domain. It reveals who actually competes for rankings, not just which brands are recognized as rivals.

The strongest approach is a blended list: cross-check the Competing Domains suggestions against known business competitors, keeping domains that appear relevant on both counts and adding high-overlap search competitors that business teams may have overlooked.

The 2-5 Competitor Sweet Spot (and Why 10 Is a Trap)

The practical best practice is two to five competitors. Beyond that, noise increases and it becomes harder to focus on the gaps that actually matter.

The mechanism is simple: each added domain widens the pool of unrelated intents and topic clusters, diluting the relevance of the opportunity list.

Recommendation: Start with three tightly matched search competitors. Expand only if the initial list feels too thin.

Interpreting the Report: Turning a Wall of Keywords Into a Plan

First-run overwhelm is expected. Even after filtering, the list should be triaged before anything goes into a content queue.

Understanding the Report Columns

The results include several key columns:

• Search volume: estimated monthly searches
• Keyword difficulty: how hard it is to rank in the top results
• Traffic potential: the estimated traffic the top-ranking page receives across all keywords it ranks for
• Number of competitors ranking: how many of the entered domains rank for the term

That last column works as a confidence signal. Terms where multiple competitors rank are often safer, more validated opportunities than one-off outliers that only a single competitor happens to rank for.

A Practical Triage Method

1. Sort by traffic potential first. It reflects the true value of a topic better than single-keyword volume.
2. Cross-check keyword difficulty against the domain’s current authority. A young site should deprioritize high-KD terms for now.
3. Export to CSV. Group keywords into topic clusters in a spreadsheet rather than treating each row as a standalone article. Many rows will collapse into a single, comprehensive page.

The Four Types of Content Gaps Ahrefs Can’t Tell Apart

This is the central limitation of the tool. The report only flags that a gap exists. It does not identify what kind of gap it is. That single fact explains why the raw export is a diagnostic, not a roadmap.

There are four distinct gap types, and each requires a different response.

Topic Gaps: Nothing Published At All

The keyword has zero corresponding content on the domain. This is the clearest and easiest gap type to act on directly from the Ahrefs export: create a new page.

Intent Gaps: Content Exists, But Doesn’t Match the Searcher

A page exists and may even rank adjacently, but it answers the wrong question format. A product page targeting an informational query is a classic example. Ahrefs’ keyword list alone won’t reveal this mismatch; it takes a manual SERP review to see what format searchers actually expect.

Quality Gaps: Thin or Outdated Coverage

A page covers the topic, but superficially or with stale data and examples. The keyword overlap may look fine in Ahrefs, yet the page still loses to a more thorough competitor.

Originality Gaps: A Page Exists But Just Echoes Competitors

The content exists and is reasonably comprehensive, but offers no unique data, perspective, or proprietary insight. It is functionally interchangeable with competing pages. This gap type increasingly matters for AI Overview and Generative Engine Optimization (GEO) visibility, where AI systems tend to cite sources that contribute something distinct.

Why a Manual, Point-in-Time Ahrefs Export Can’t Close the Loop

The limitations are worth naming specifically:

• No alerts when new gaps open
• No re-crawl triggers tied to competitor publishing
• Manual re-running is required every time
• Zero visibility into AI citation performance

The Point-in-Time Snapshot Problem

Gaps open and close constantly as competitors publish and update. A report run today is already partially stale by the time a content brief is written, approved, and published weeks later.

Industry commentary in 2026 reflects this shift: content gap analysis used to mean exporting CSVs and cross-referencing spreadsheets, but treating it as a one-time quarterly project is increasingly a liability as automated approaches turn the analysis into a continuous input layer rather than a periodic event.

No Visibility Into AI Overview or AI Citation Gaps

Ahrefs is built for keyword and backlink intelligence, not AI citation analysis. It won’t explain why a competitor’s page gets cited in Google AI Overviews or ChatGPT while another site’s page doesn’t.

This has created a new category: the AI visibility gap. These are pages that rank well in traditional search but never appear in AI-generated answers. No keyword-overlap report can see this blind spot.

Quick Context: How This Compares to Other Keyword-Overlap Tools

This limitation is not unique to Ahrefs. Other mainstream keyword-research platforms offer similar functionality: comparing the keyword portfolios of multiple domains side by side to surface terms competitors rank for that the target doesn’t, along with shared keywords and underperforming rankings.

It is structural to any static, manual keyword-overlap tool, not a flaw specific to one platform. That reframes the real question from “which tool?” to “what happens after the export?”

From Manual Audit to Always-On Gap Closure

Consider the full loop this tutorial has described. After running the report, a human still has to classify each keyword’s gap type, write the brief, produce the content, publish it, interlink it, and remember to re-run the entire process. It is repeatable, but it is entirely manual.

For teams that have validated this process but lack the bandwidth to run it continuously, KOZEC represents the logical next step. KOZEC is an AI-powered SEO content automation platform, built on agentic AI, that performs business and competitor analysis, topic discovery, and content gap identification as an ongoing background process rather than a quarterly export.

The difference is a closed loop. KOZEC doesn’t just surface gaps. It drafts, structures, interlinks, and publishes content built to close them, including GEO structuring designed for visibility in AI Overviews and generative search. The work is guided by KOZEC’s SCO (Search Compliance Optimization) framework, which focuses on Google’s recommended practices: useful content, clear pages, smart internal links, and consistent publishing, rather than algorithmic shortcuts.

In practical terms, KOZEC is what a team would build if it automated everything this tutorial just walked through manually.

The stakes are rising. AI Overviews appeared on 48% of Google queries as of April 2026, up from 31% in February 2025. Static, keyword-only gap analysis is no longer sufficient on its own when nearly half of searches surface an AI-generated answer.

Conclusion: The Ahrefs Content Gap Tool Is a Diagnostic, Not a Strategy

This tutorial delivered three things most guides leave out:

1. Domain-level vs. URL-level mechanics, and when to use each.
2. Competitor selection strategy, using the Competing Domains report and the 2 to 5 competitor sweet spot.
3. The four types of content gaps, so results are interpreted correctly.

The central thesis holds: Ahrefs tells users a gap exists. It doesn’t tell them what kind of gap it is, and it doesn’t keep working after the browser tab closes.

Disciplined manual use of the tool is a necessary first step. For teams serious about compounding organic growth in 2026, it is not a complete strategy.

Ready to Stop Running This Process Manually?

KOZEC automates business and competitor analysis, gap identification, content production, and publishing as one continuous agentic workflow.

Book a demo at kozec.ai/schedule-a-demo/ to see the full workflow in action, from gap discovery to published, interlinked content.

For lean marketing teams and growth-stage businesses, this isn’t about replacing the Ahrefs audit skillset covered here. It’s about not having to repeat it manually every quarter.