SEO & data

How to Do Backlink Gap Analysis: From Competitor Domains to Outreach List

From selecting comparable competitors, exporting intersecting domains, deduplication and quality filtering, to matching linkable content, finding contacts, personalized outreach, and review—build a repeatable white-hat link building workflow.

12 minSEO link buildersRelayX Editorial TeamUpdated August 23, 2026

TL;DR

Three ideas before you begin

  • Prioritize domains that link to multiple competitors
  • Pair automated metrics with manual relevance review
  • Segment by partnership reason instead of mass-sending one template

Before you start

Prepare the inputs

  • Prepare your domain and three to five content-comparable competitors
  • Define the page or topic you want to promote
  • Prepare a sheet for source pages, contacts, and status
01

Step 1

Choose competitors suitable for link comparison

Business competitors are not always the best link competitors. Choose sites with comparable topics, audiences, and page types.

  1. 1.1

    Separate business and content competitors

    Keep direct business competitors, then add publishers, tool sites, or content brands that consistently earn links in the target topic.

  2. 1.2

    Exclude incomparable giant domains

    Observe encyclopedias, social platforms, and major publishers separately so they do not overwhelm reachable niche opportunities.

  3. 1.3

    Record the target page type

    Specify whether you are promoting research, a tool page, a guide, or a resource page, then compare pages with similar linking reasons.

Checkpoint

Every competitor should have a one-sentence reason explaining why it belongs in the link comparison.

02

Step 2

Extract the gap and narrow the set

Start with intersections for stronger shared signals, then add quality and topic filters.

  1. 2.1

    Run a domain-level gap

    Enter your domain and competitors, then filter for referring domains linking to at least two competitors but not you.

    Ahrefs Backlink Checker marking the target input, domain mode, and check button
    Real product interfaceFor step 2.1 Open full-size
    Normalize every competitor domain mode before running a domain-level gap.
    Markers
    1. 1 Target domain or URL
    2. 2 Domain mode
    3. 3 Run check

    Choose the whole domain, subdomain, or exact URL before querying. This is the free checker entry; a formal backlink gap still requires a supported Link Intersect or gap report.

    Verify source: Ahrefs official Backlink Checker
  2. 2.2

    Keep the exact source pages

    Do not export root domains alone. Save the exact source page, anchor, destination, and first-seen date to understand the context.

  3. 2.3

    Pre-filter by topic and language

    Remove results clearly unrelated to the target market, language, or topic before the more expensive manual review.

Checkpoint

Reduce the initial output to a candidate set small enough for page-by-page review.

03

Step 3

Manually verify relevance and attainability

Authority metrics cannot explain why a site would link to you; that requires page-level context.

  1. 3.1

    Open the source page and verify the link

    Check that the page is accessible and maintained, whether the link sits in the body, and why the competitor was referenced.

  2. 3.2

    Assess business relevance

    Score audience overlap, topical fit, geography/language, and page quality from zero to two.

  3. 3.3

    Flag risk and unreachable prospects

    Exclude obvious link networks, expired pages, low-quality sites, and sources with no credible collaboration path.

Checkpoint

Every retained domain should have a relevance score, link context, and at least one credible partnership reason.

04

Step 4

Segment, find contacts, and design outreach

Segment prospects by why they may link so outreach can be specific.

  1. 4.1

    Segment by opportunity type

    Common groups include resource additions, data citations, content updates, expert input, tool listings, and co-created content.

  2. 4.2

    Find the most relevant contact

    Prioritize the author, section editor, or partnerships owner, recording the source and verification date without collecting irrelevant personal data.

  3. 4.3

    State a specific value exchange

    Mention the page reviewed, what you can add, and why readers benefit. Do not fabricate relationships or offer undisclosed incentives.

Checkpoint

Every high-priority prospect should have a contact, partnership reason, personalization evidence, and next follow-up date.

05

Step 5

Track outcomes and refresh priorities

An outreach list is a learning dataset, not a sheet that ends after one send.

  1. 5.1

    Track process metrics

    Track delivery, replies, positive replies, confirmed collaborations, live links, and rejection reasons.

  2. 5.2

    Compare performance by segment

    Identify which partnership reasons and source-page types perform best instead of relying on overall reply rate.

  3. 5.3

    Refresh the gap monthly

    Add new sources, remove dead pages, and feed successful patterns back into content and digital PR planning.

Checkpoint

Your list should explain what worked, why it worked, and how the next round will be more focused.

WHO · HOW · WHY

How this guide was written and reviewed

Who
Independently written and manually reviewed by the RelayX Editorial Team, with update and capture dates shown on the page.
How
Fix geography, time, device, and domain scope first, then cross-check third-party estimates with owned analytics, search-console data, or public pages. No single traffic or authority score is treated as a business result.
Why
The goal is not to restate product features but to help you produce “A verified, segmented outreach list with clear ownership”. The workflow is organized around that outcome with checkpoints, limitations, and next actions.

Interface captures come from official accessible product pages or the current browser interface. Each appears under its matching step with numbered controls and data points. When real functional UI cannot be publicly verified, the guide says so instead of using a marketing homepage as filler. No third-party tutorial text or imagery is reused; third-party brands and interface rights remain with their respective owners.

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