b2KIT

Link Intersection Finder

Upload multiple backlink lists and find domains that link to your competitors but not to you. Prioritize by frequency and relevance.

Tested tool guide Tested browser tools Checked August 16, 2026

What Link Intersection Finder does, with a checked example

A backlink export shows where links already exist; Link Intersection Finder identifies referring domains present in competitor exports but absent from yours. Provide one list for your site and separate lists for competing sites. It compares the represented domains, excludes those already found in your list, and prioritizes the remaining opportunities by frequency and relevance. The common surprise is that absence means absent from the supplied data, not proven absent from the web. Selected files are processed in the browser and are not uploaded to a server.

Worked example

A concrete input and expected output from the current implementation.

Input

Your list:
https://source-a.example/post
https://already.example/guide

Competitor A:
https://source-a.example/a-link
https://shared.example/page-1
https://only-a.example/article

Competitor B:
https://shared.example/page-2
https://only-b.example/resources
https://already.example/another

Expected output

Opportunity domains:
shared.example - frequency 2
only-a.example - frequency 1
only-b.example - frequency 1

shared.example occurs in both competitor lists and not in yours, giving it a frequency of 2. source-a.example and already.example are excluded because your list already contains them; each remaining domain occurs once.

How the result is produced

1

Domain intersection

The comparison works at the referring-domain level. It identifies domains represented in the competitor inputs, records their repeated appearances, and removes domains represented in the list for your own site. The remainder is a prospect set, not a set of acquired links: every result still requires evaluation before outreach.

2

Opportunity ordering

Frequency helps surface domains appearing repeatedly across the competitor data, while relevance helps prioritize the resulting candidates. Neither signal establishes that a site is authoritative, receptive to outreach, or appropriate for your page. Treat the ordering as a review queue and inspect the original backlink records before deciding which domains deserve attention.

Good uses

  • Building an outreach list from backlink exports for your site and several organic-search competitors.
  • Finding publishers that cite multiple competing products but do not appear in your own supplied backlink data.
  • Narrowing a large collection of competitor backlinks to domains worth reviewing before pitching a study, resource, or product page.

Limits and checks

  • A missing domain is missing only from the uploaded list. Export limits, date ranges, filters, or stale source data can create false opportunities.
  • Hostname treatment matters. blog.example.com and www.example.com may need to be interpreted as separate hosts or as parts of the same registrable domain.
  • High frequency is not equivalent to link quality, topical fit, traffic, authority, or a realistic chance of earning a backlink.

Common questions

Does the result prove that none of these domains links to my site?

No. It proves only that the domain was not found in the backlink list you supplied. A link might be missing because the export is incomplete, filtered, outdated, or limited to a particular property. Confirm important prospects against a current backlink source and check whether alternate hostnames or site versions were omitted.

Is the domain with the highest frequency automatically the best outreach target?

No. Frequency shows repeated presence in the supplied competitor data, which can indicate a broadly relevant source, but it does not measure editorial quality or outreach feasibility. Review the linking pages, subject matter, destination types, and any duplicate records before deciding whether the domain represents a useful and attainable opportunity.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.

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