Backlink Gap Analysis: Find Links Your Competitors Have and You Don't

The hardest part of link building is knowing where to start. A backlink gap analysis removes the guesswork. Instead of hunting for sites that might link to you, you find the sites that already link to your competitors but not to you. Those are the most qualified targets you can get.

This guide explains what a backlink gap analysis is, how to run one for free, and how to turn the results into a practical outreach shortlist.

What is a backlink gap analysis?

A backlink gap analysis compares your backlink profile against several competitors to find the referring domains they have and you do not. Each of those domains has already shown it will link to content in your niche, so it is a warm prospect rather than a cold one. The "gap" is the set of links standing between your profile and theirs.

It is sometimes called a link gap or link intersect analysis. The most valuable gaps are domains that link to two or three of your competitors at once, because a site linking to several players in your space is very likely to consider you as well.

Why is a link gap the fastest way to build links?

Cold outreach is slow because most recipients have no reason to care. A gap analysis fixes the targeting problem before you send a single email.

• The intent is proven. A site that links to a competitor has already decided your topic is worth linking to. You are not persuading them to care, only to include you.
• The format is proven. The pages earning those links, resource lists, roundups, comparison posts, tell you exactly what kind of content attracts links in your niche.
• The shortlist is finite. Rather than an endless web of possibilities, you get a defined list of domains ranked by how many competitors they already link to.

This is why a gap analysis consistently beats guessing. You are copying a link-building pattern that already works for sites ranking where you want to rank.

How do you run a backlink gap analysis for free?

You can do this without a paid tool. The process has three stages.

1. Choose your link-building competitors. These are the sites ranking for your target keywords, which are not always your direct business rivals. Search your main keyword in Google and note the top five or so results.
2. Compare profiles in one pass. Enter your domain and your competitors into the backlink gap checker. It pulls every referring domain for each site and shows which ones link to competitors but not to you.
3. Find the overlap targets. Use the link intersect tool to surface domains that link to multiple competitors at once. These sit at the top of your list because they are the most likely to link to you too.

If you want to inspect a single competitor in depth first, run it through the standard backlink checker to see its referring domains and top links by authority before you compare.

How do you prioritise the gaps?

A raw gap list can be long. Sort it before you start outreach.

1. Domains linking to the most competitors. A site linking to three of your five competitors is a stronger, warmer target than one linking to a single competitor. Work top down.
2. Quality over quantity. One link from a respected industry publication is worth more than dozens from thin directories. Use the quality ratings to skip low-value domains, and cross-check anything questionable against a backlink audit mindset so you are not chasing links you would later disavow.
3. Repeatable formats. Resource pages, "best tools" lists, and link roundups are the easiest wins because inclusion is often a simple, low-friction request rather than a pitch for a new article.

How do you turn gaps into links?

The gap analysis gives you the shortlist. Converting it takes the same outreach discipline as any link campaign: find the right contact, lead with why your page genuinely improves theirs, and keep the ask specific.

The most reliable pattern is to match or beat the content that earned the competitor its link. If a domain links to a competitor's guide, a more current or more thorough version of that guide gives them a concrete reason to add or switch the link. Our guide on how to find competitor backlinks covers the outreach process in full, from identifying contacts to writing the pitch.

Treat the gap list as a living document. Re-run the analysis every quarter, because competitors earn new links constantly and each fresh batch is a new set of proven targets. Combined with a steady flow of link-worthy content, a repeated gap analysis is one of the most efficient link-building routines you can run.

Frequently asked questions

What is the difference between a backlink gap analysis and competitor backlink analysis?

Competitor backlink analysis looks at one competitor's links at a time. A backlink gap analysis compares several competitors against your own profile at once, so it surfaces the domains that multiple rivals share but you are missing. The gap version is better for prioritising, because shared links are the warmest targets.

How many competitors should I include?

Three to five is the practical sweet spot. Too few and you miss shared patterns, too many and the list becomes noisy. Choose the sites genuinely ranking for the keywords you want, not just the biggest brands in your industry.

Can I run a backlink gap analysis for free?

Yes. Crawly's backlink gap checker and link intersect tool are free with no account, and compare your referring domains against several competitors to show exactly which links you are missing.

What is a link intersect?

A link intersect is the set of domains that link to two or more of your competitors at the same time. These are the highest-priority prospects in a gap analysis, because a site already linking to several sites in your space is the most likely to link to you as well.

How often should I repeat a gap analysis?

Every quarter is a sensible cadence for most sites, plus after any major competitor campaign. Backlink profiles change constantly, so a quarterly re-run keeps your outreach shortlist current without becoming busywork.