Key Takeaways - Backlink gap analysis identifies domains linking to your competitors but not you — these are pre-validated link opportunities in your niche - Semrush's Backlink Gap tool lets you compare up to 5 domains simultaneously; Ahrefs' Link Intersect filters by domains linking to multiple competitors (highest-priority targets) - Domains linking to 3+ of your competitors are significantly more likely to link to you than cold prospects - Per Editorial.link's 2026 State of Link Building, only 21.8% of SEOs consider competitor backlink replication "effective" — but those who do it *systematically* rather than sporadically report strong results - Run this analysis quarterly — your competitors are building new links every month
Your Competitors Already Did the Hard Part
Every link your competitor has earned represents a publication that: - Covers your topic area - Has editorial standards (or at least link policies) - Already decided that a site like yours is worth linking to - Would plausibly link to you if you gave them a compelling reason
That's three qualification steps that cold link prospecting normally requires — handled already. Backlink gap analysis is the practice of systematically identifying these pre-qualified opportunities: domains that link to your top competitors but haven't linked to you yet.
The concept is simple. The execution — knowing which competitors to analyze, how to filter the data for actionable targets, and how to prioritize the gap list — is where most practitioners lose the efficiency gains.
This is the step-by-step process I use for SaaS clients targeting 10–25 new referring domains per month, with specific tool instructions for Ahrefs and Semrush and a prioritization framework that translates a raw gap list into a link-building roadmap.
Step 1: Choose the Right Competitors to Analyze
The instinct is to analyze direct business competitors. That's wrong for link building purposes.
For backlink gap analysis, you want SERP competitors — the sites that rank in the top 10 for your primary keywords — not necessarily the companies selling similar products.
Why the distinction matters: a SaaS tool competing with Asana doesn't need Asana's links. It needs links from the publications that cover project management, productivity, and team collaboration for the audiences it's trying to reach. A 10-year-old company with DR 80 and 15,000 referring domains isn't a useful gap analysis subject — the gap is too large and the sources too hard to replicate.
How to Identify SERP Competitors
Run a Google search for your 3–5 primary keywords. Note the top 10 organic results (excluding ads, featured snippets, and Google-owned properties). These are your SERP competitors. Three to five competitors is the optimal number for gap analysis — enough to find overlapping link sources without drowning in data.
Filter criteria for competitor selection: - Similar or achievable DR — If your site is DR 25, analyze sites in the DR 25–55 range, not DR 80+ sites - Similar domain age and content volume — Sites that scaled from similar starting points have more replicable link profiles - Active link growth — Check Ahrefs' referring domain growth graph. You want competitors actively acquiring links in the same channels you'll target
For a new SaaS tool at DR 20 competing in a productivity vertical, analyzing a DR 45–55 competitor with 1,200 referring domains is more actionable than analyzing the DR 75 category leader with 18,000 referring domains.
Step 2: Run the Gap Analysis
Method A: Ahrefs Link Intersect
Ahrefs' most powerful gap analysis feature is Link Intersect (under the "More" dropdown in Site Explorer, or directly at ahrefs.com/link-intersect).
Process: 1. Enter your domain in the "But doesn't link to" field 2. Add 3–5 competitor domains in the "Show pages that link to" fields 3. Set the mode to "All targets" to find domains linking to ALL selected competitors, or "At least one target" for a broader list 4. Run the report
The "All Targets" filter is the prioritization hack: domains linking to all 3 of your competitors and not you are the highest-conviction targets in your gap list. They've already demonstrated they link to multiple sites in your niche — they're not single-company brand advocates, they're topical references. Their linking to you is a plausible extension of existing behavior.
Filter the output: - Set DR minimum to 30 (below this, links provide minimal authority transfer) - Filter by "Dofollow only" — nofollow links from gap analysis are less valuable - Sort by DR (descending) to prioritize highest-authority targets
Export to CSV. This is your gap prospect list.
Method B: Semrush Backlink Gap Tool
Semrush's Backlink Gap tool (under the Link Building section) allows comparison of up to five domains simultaneously — a significant advantage over Ahrefs' Link Intersect for competitive categories.
Process: 1. Navigate to Semrush → Link Building → Backlink Gap 2. Enter your domain and up to 4 competitor domains 3. Click "Find Prospects"
Semrush outputs a table showing each referring domain, its Authority Score, which competitors it links to (marked with colored indicators), and whether it links to your domain. The visual overlap display makes it immediately clear which domains are linking to 3–4 competitors but not you.
Filter and sort: - Authority Score minimum: 20+ - Sort by "Best" (Semrush's default relevance ranking) or manually sort by Authority Score - Filter to show domains linking to 2+ competitors but not to you
One Semrush advantage over Ahrefs for gap analysis: Authority Score incorporates organic traffic alongside backlink signals, which means it filters out DR-inflated link farms more reliably. A site with DR 40 but near-zero organic traffic won't appear as high-priority in Semrush's gap output the way it might in Ahrefs' Link Intersect.
Method C: Manual Gap Analysis (Free)
For sites under DR 20 with limited tool budgets, a manual gap analysis process works:
- Export competitor backlinks using Ahrefs' free tier (limited to top 100) or Moz's free Link Explorer
- Build a spreadsheet with columns: Domain, Competitor A, Competitor B, Competitor C, Links to You
- For each referring domain, manually check whether it links to your site
- Flag domains linking to 2+ competitors but not you
This takes 2–4 hours versus 20 minutes with paid tools, but the output is identical. For early-stage sites running gap analysis quarterly, the manual method is a reasonable starting point.
Step 3: Score and Prioritize the Gap List
A raw gap list might contain 200–2,000 domains depending on your competitive set. Not all are worth pursuing. Prioritization requires scoring across three dimensions:
| Dimension | Signals | Weight | |---|---|---| | Authority | DR/Authority Score of referring domain | 35% | | Relevance | Topical alignment between source and your site | 40% | | Linkability | # of competitors they link to; type of link (editorial vs. directory) | 25% |
Relevance is the highest-weight factor. A DR 50 site in your exact vertical is worth more than a DR 70 generic news aggregator. The Ahrefs best practices guide on backlink gap analysis explicitly recommends filtering for topical relevance before authority — a high-DA link from an irrelevant source provides minimal ranking value for targeted keywords.
Practical Triage Process
Batch your gap list into three tiers:
Tier 1 — High Priority (immediate outreach) - Links to 3+ of your competitors - DR/AS 40+ - Topically relevant (covers your niche or adjacent topics) - Link type: editorial, resource page, or roundup (not paid/sponsored)
Tier 2 — Medium Priority (outreach in next 60 days) - Links to 2+ competitors - DR/AS 25–40 - Reasonably topically relevant
Tier 3 — Monitor Only - Links to only 1 competitor - DR below 25 or topically tangential - Not worth outreach investment currently; re-evaluate after gap closes
For most sites, Tier 1 contains 20–80 domains — a manageable outreach target for 30 days of focused link building.
Step 4: Classify the Link Type to Pick the Right Tactic
Each gap domain requires a different acquisition approach depending on how they linked to your competitor. Open each Tier 1 domain in Ahrefs or Semrush and look at the specific page that links to your competitor:
If it's a resource/tools roundup page: Pitch to be added to the list. Your email is brief: "I noticed you've listed [competitor] on your [page title]. We offer similar functionality with [differentiator]. Would it make sense to add us?"
If it's an editorial mention in a blog post: Pitch original content for a future post. Don't ask them to edit the existing post — that's an unusual request that usually gets rejected. Instead, pitch a new article where your site is the natural reference.
If it's a guest post from someone in your niche: Contact that author (who may publish elsewhere) rather than the site editor. The author with established relationships at that publication is a warm introduction pathway.
If it's a directory or citation listing: Submit directly without personalized outreach. Use Backlynk's submit tool to submit to structured directories systematically — manual submission to 50+ directories is time-consuming and error-prone when done one at a time.
If it's a PR mention or news article: This is the hardest type to replicate on demand. Prioritize digital PR campaigns (original research, data studies, product launches) that can generate similar coverage organically.
Step 5: Execute Outreach With Gap Context
The most powerful thing about gap-derived prospects versus cold prospects: you have specific context for your outreach email.
Instead of: *"Hi [Name], I noticed you cover [topic] and wanted to pitch a guest post..."*
You can write: *"Hi [Name], I noticed you referenced [Competitor] in your piece on [specific article title]. We've built [Your Product] to solve the same problem — and we have [specific differentiator or data point] that might be useful for your readers if you ever revisit that topic."*
This framing does three things cold outreach can't: 1. Proves you've done research (you know they link to a competitor) 2. Signals legitimate relevance (you're in the same category they already cover) 3. Creates a logical editorial hook (updating or extending existing coverage)
Gap-informed outreach combined with the personalization templates from our link building outreach guide is the combination that pushes acceptance rates into the 12–20% range.
A Real-World Gap Analysis Example
To make the process concrete, here's a simplified case from a B2B SaaS analytics client (anonymized):
Starting point: DR 28, 180 referring domains Competitors analyzed: 4 SaaS tools in the same analytics category (DR 42–58) Gap analysis tool: Semrush Backlink Gap
Raw output: 1,847 domains linked to competitors but not to the client.
After filtering (Authority Score 30+, dofollow, topically relevant): 218 actionable domains
After tiering: - Tier 1: 34 domains (3–4 competitor links, AS 40+, editorial links) - Tier 2: 89 domains - Tier 3: 95 domains (monitor only)
60-day outreach campaign targeting Tier 1: - 34 personalized outreach emails sent - 6 accepted (17.6% acceptance rate — above the 7–12% moderate personalization benchmark because of gap-informed context) - 6 new referring domains at AS 38–62 average - DR lifted from 28 to 34 over the following 90 days
That result — 6 high-quality links from 34 emails — required approximately 15 hours of work: 2 hours for gap analysis and triage, 8 hours for personalized outreach writing, 5 hours for follow-ups and communication. Cost of equivalent DR 40+ links via paid placements: approximately $500–$900 each, or $3,000–$5,400 for 6 links. The organic approach produced comparable authority links at a fraction of the cost.
Competitive Intelligence Beyond Links
Backlink gap analysis produces a valuable secondary output: a map of where your competitors are getting coverage.
When you examine your gap list, patterns emerge: - Publication clusters — 5 of the 34 Tier 1 domains above were productivity-focused media publications. This identifies a content vertical worth pursuing systematically through editorial pitching. - Industry association sites — Multiple competitors had links from trade associations. Membership (if available) provides automatic citation links. - Podcast mention links — Several gap domains were show notes pages. Podcast guest appearances are a high-leverage approach in SaaS categories. - Review and comparison sites — Competitors appearing on G2, Capterra, and similar platforms suggest review site optimization as a parallel link acquisition channel.
The gap list isn't just an outreach list — it's a strategic intelligence document about how your category earns media attention. Use it to shape content strategy, PR outreach priorities, and partnership development alongside direct link acquisition.
How Often to Run Gap Analysis
Your competitors are building new links every month. A gap analysis run once and never revisited produces a list that decays rapidly.
Recommended cadence: - Monthly for aggressive link building campaigns (10+ new referring domains/month target) - Quarterly for steady-state link building programs (3–8 new referring domains/month) - Ad-hoc after a competitor's notable content launch or PR event (use Ahrefs' "New Backlinks" alert on competitor domains to detect spikes)
Ahrefs and Semrush both support competitor backlink monitoring with email alerts. Set alerts on your top 3–5 competitors to receive notifications when they acquire new referring domains — this creates a real-time gap list that surfaces fresh opportunities before they become stale.
Use Backlynk's backlink analyzer to monitor your own referring domain growth and cross-reference it against your competitor tracking on a monthly basis.
Frequently Asked Questions
What is a backlink gap analysis?
Backlink gap analysis is the process of comparing your site's backlink profile against competitors to identify domains that link to them but not to you. These gap domains are pre-qualified link prospects — they've already demonstrated they link to sites in your niche. The analysis typically uses tools like Ahrefs Link Intersect or Semrush Backlink Gap and produces a prioritized list of domains to target for outreach or submissions.
How many competitors should I include in the analysis?
Three to five SERP competitors is the sweet spot. Fewer than three produces a small gap list that may miss important opportunity clusters. More than five creates data overload and includes too many competitors at different DR levels to produce clean prioritization. Choose competitors with similar or slightly higher DRs than yours — not category-dominant sites with 10x your referring domains.
Which tool is best for backlink gap analysis — Ahrefs or Semrush?
Both are excellent. Ahrefs' Link Intersect is more granular for filtering by "links to ALL competitors" — the highest-conviction gap signal. Semrush's Backlink Gap tool allows comparison of up to 5 domains simultaneously and uses Authority Score (which factors in organic traffic) for better quality filtering. If you have both subscriptions, run the analysis in both and cross-reference: domains appearing in both tools' gap outputs are the most reliable targets.
How do I turn gap domain data into actual links?
Identify the specific page on each gap domain that links to your competitor, classify the link type (editorial, resource page, directory, etc.), and tailor your outreach approach accordingly. Resource pages get short "please add us" pitches. Editorial links require content pitches with full topic proposals. Directories get direct submissions via Backlynk's submit tool. The gap context ("I noticed you linked to [competitor] in [specific article]") dramatically improves outreach acceptance rates versus cold pitching.
What DR filter should I apply to the gap list?
For sites under DR 30, target gap domains at DR 25+. For sites with DR 30–50, focus primarily on DR 35+ targets. For DR 50+ sites, prioritize DR 50+ gap domains but don't ignore DR 30–49 targets in highly relevant publications. The Ahrefs best practices guide recommends removing DR below 20 from gap analysis lists — links from those domains provide minimal authority transfer and represent a poor time investment.
How is backlink gap analysis different from a standard competitor backlink analysis?
Standard competitor backlink analysis shows you everything a competitor has — all 2,000 of their referring domains. Gap analysis filters to only the domains you don't already have. It's a subset of competitor analysis focused specifically on actionable acquisition targets rather than competitive intelligence broadly. Gap analysis is the first step in building a targeted outreach list; standard competitor analysis is the first step in understanding overall competitive positioning.
How long does a backlink gap analysis take?
With Ahrefs or Semrush, the raw analysis takes 15–20 minutes. Filtering, tiering, and prioritizing a list of 200–500 raw gap domains takes 60–90 minutes. For a well-structured campaign, allocate half a day to run the full analysis, triage the list, and prepare outreach context notes for Tier 1 targets. This investment typically yields 30–80 qualified outreach targets — enough for a full month of focused link building.
Can I do a backlink gap analysis without paid tools?
Yes, with limitations. Ahrefs' free tier provides up to 100 backlinks per domain — enough for early-stage analysis if competitors have fewer than 300 total referring domains. Moz's free Link Explorer provides similar data. The manual process (exporting competitor backlinks, cross-referencing in a spreadsheet) takes 3–5x longer than paid tools but produces the same output. If you're running gap analysis more than once per quarter, a paid Ahrefs or Semrush subscription pays for itself in saved time within 1–2 analyses.
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*Backlink gap analysis is most powerful as the first step in a structured link-building workflow: identify the gap domains, categorize the link types, and then execute targeted outreach or submissions. For the directory-type gaps — where competitors are listed in business directories you're not — Backlynk's submit tool handles systematic submissions across 200+ quality directories so you can close the directory gap at scale while focusing your manual effort on the editorial targets that require personalized outreach. Start your backlink analysis to see where your profile stands relative to competitors.*