Your competitors have already done the hard part of your link building for you. Every site that links to them is a site that covers your topic and is willing to link out — and you can see the entire list for free. Studying competitor backlinks is the fastest way to find realistic, relevant link prospects, because it replaces guesswork with a list of sites that have already proven they link to businesses just like yours. Here is how to find those links without paying for a tool, and how to turn the list into links of your own.
Use a free backlink checkerto see any competitor's referring domains, then use link intersect to find the sites linking to several competitors but not to you — ranked by relevance. Qualify each by authority, work out why it linked, and earn your own version.
Why competitor backlinks are the best prospect list you have
Most link building starts from the wrong question — “which authoritative sites could link to me?” — and ends in silence, because those sites have no reason to care about you. Competitor backlink analysis flips it. A site already linking to two or three of your direct competitors has demonstrated two things that cold prospects never do: it publishes about your exact topic, and it hands out links. The probability it will link to you too is an order of magnitude higher than any list built on authority alone. You are not cold-pitching a stranger; you are approaching someone who already does this, for people just like you.
Step 1: see a competitor's referring domains (free)
You do not need to own or verify a competitor's site to inspect its links — backlinks are public. Drop their domain into a free backlink checker and you get their referring domains: the unique sites pointing at them, ranked by authority. Read this the way an analyst would, not as a list to copy blindly:
- Sort by referring domain and authority. The strong, relevant domains at the top are the links doing real work and your highest-value targets.
- Look for patterns. Are the same kinds of sites recurring — industry blogs, resource pages, directories, podcasts, news? Patterns reveal repeatable link types you can pursue systematically.
- Ignore the junk. Skip the low-authority, irrelevant and clearly spammy domains; chasing those wastes time and can hurt you. (Curious whether a profile is clean? Our toxic backlink checker scores the risky patterns.)
Step 2: find the gap with link intersect
Looking at one competitor is useful; comparing several against yourself is where the real prospect list appears. That technique is link intersect, and it is the single highest-hit-rate method in link building. Enter your domain plus two or three direct competitors into link intersect, and it returns the domains linking to your competitors but not to you, ranked by how many of them each already links to.
The ranking is the magic. A site linking to all three competitors but not you is your hottest prospect — it clearly covers your niche and clearly links out, so the only reason it hasn't linked to you is that it doesn't know you exist yet. Working the list from the top down puts your outreach time where the probability of a link is highest. Seoluma also filters out platforms that link to everyone — blog hosts, social networks — so the list stays genuinely actionable.
| Prospect links to… | What it signals | Priority |
|---|---|---|
| All 3 competitors | Deeply relevant, links freely, doesn't know you | Highest — pitch first |
| 2 of 3 competitors | Relevant and reachable | High |
| 1 competitor | Possibly relevant; qualify carefully | Medium |
Step 3: qualify before you pitch
Not every gap is worth chasing. Before you spend outreach effort, qualify each prospect on two axes:
- Authority. Run the domain through the authority checker. A relevant niche site at a moderate score is often worth more than a generic high-authority directory — but you want to know what you're getting.
- Relevance. Open the site. Would its real readers plausibly care about yours? A link from a genuinely on-topic site passes far more useful signal than an equally strong link from an unrelated one.
Step 4: work out why they linked — then earn it
The last step turns a prospect into a link. For each qualified target, find the page that links to your competitor and understand the mechanism, because that tells you exactly how to get your own link:
- Resource or “best of” list → pitch your product or page for inclusion; make the case that you belong on the list.
- Editorial mention in an article → build a relationship, offer a better data point, quote or example the writer can use.
- Guest post or interview → pitch your own contribution to the same outlet.
- Directory or citation → simply get listed too, if it's a quality, relevant directory.
- They cited original data or a tool → create something equally linkable of your own — the most durable link magnet there is.
Make it a routine, not a one-off
Competitor link profiles change as they earn new links, so the gap list refreshes itself. Re-run link intersect against your top competitors every month and the new entries are fresh prospects — links your rivals just earned and you can now pursue. Pair that with a glance at your own referring domains to track your progress, and you have a complete, free link-building engine: study who links to competitors, find the gaps, qualify them, and earn your own version — on repeat. It costs nothing but attention, and it consistently outperforms buying links or cold-pitching strangers.
Frequently asked questions
How can I see my competitors' backlinks for free?
Enter a competitor's domain into a free backlink checker like Seoluma's — you don't need to own or verify their site to see its referring domains. To find opportunities rather than just audit, use link intersect: it shows the domains linking to several competitors but not to you, ranked by relevance, so you get an actionable prospect list instead of a raw dump.
What is link intersect and why is it better than a raw backlink list?
Link intersect compares several competitors' backlink profiles against yours and surfaces the sites linking to them but not you. Those domains have already proven they cover your topic and give links, which makes them far warmer prospects than a cold list of high-authority sites. A raw backlink export tells you what exists; link intersect tells you what to pursue.
Is it legal and ethical to look at competitors' backlinks?
Yes. Backlinks are public — anyone can see which sites link to a page. Analysing competitors' link profiles is standard, legitimate SEO research, not hacking or scraping private data. You're studying the open web to find where you should be earning links too.
How many competitors should I analyse?
Two or three direct competitors is the sweet spot for link intersect. Requiring a prospect to link to at least two of them filters out generic sites that link to everyone and surfaces genuinely relevant, reachable targets. More than three tends to add noise rather than better prospects.
What do I do after I find a competitor's backlink?
Qualify it, then earn your own version. Check the linking domain's authority and relevance, work out why it linked to your competitor — a resource list, a guest post, a mention, a directory — and create a reason for it to link to you too, whether that's a better resource, original data, or a genuine outreach pitch.
Every tactic here is easier when you can see your starting point. Check any domain's authority and backlinks with our free checker — no account, built on an index of 118 million domains.
We measured 118M domains: more referring domains does not mean more authority. Here is what the data says to do instead.
Link Intersect: The Fastest Way to Find ProspectsThe warmest link prospects are the sites already linking to several competitors. How to find them, qualify them, and turn the list into links.
How to Check Backlinks for Free (Without Ahrefs)You don't need a $99/month subscription to see who links to a site. How to check backlinks free, read a referring-domains report, and spot real links.