Key Takeaway

Competitor backlink research means identifying which sites link to your competitors so you can target the same sources for your own link building. The most practical approach combines a free link data tool with a systematic outreach process — you do not need a paid SEO platform to get useful results.

Last updated: June 2026

How to Research a Competitor's Backlinks (Without Paying for Ahrefs)

Every backlink your competitor has earned is a lead. Someone, somewhere, decided that competitor's content or product was worth linking to. That decision tells you something useful: this linking site covers your topic, and it has already demonstrated a willingness to link out. That is a warmer prospect than cold outreach to a site you found through a keyword search.

The problem most people hit is cost. The major backlink platforms — Ahrefs, Semrush, Moz — charge anywhere from $100 to $500 a month. That is reasonable if you are running a full-time SEO operation, but it is hard to justify if you are a solo site owner trying to build links methodically without burning budget on tools.

This guide walks through a practical competitor backlink research workflow that does not require a paid subscription. The data source is Common Crawl — a public, openly licensed web crawl covering billions of pages — and the process can be done with a free desktop tool that queries it directly.

Why competitor backlinks matter

Link building from scratch is hard because you are starting with no social proof and no existing relationships. You are asking a site editor to trust a source they have never heard of. Competitor backlink research short-circuits that problem by identifying sites that are already engaged in your niche and already receptive to linking.

There are three ways you can use a competitor's backlink profile. The first is direct replication — you identify a site that links to your competitor and pitch them on linking to a comparable or better resource on your site. The second is gap analysis — you compare your backlink profile against several competitors simultaneously and find sites that link to multiple competitors but not to you, which signals a pattern worth investigating. The third is content intelligence — you look at which pieces of your competitor's content attract the most links and use that to inform what you should create.

All three approaches require the same starting point: a reliable list of who links to your competitor and from where.

The free data source most people overlook

Common Crawl is a nonprofit that has been crawling the web since 2008 and makes its data freely available. The crawl covers a significant portion of the indexed web and includes link relationship data — meaning you can query it to find out which URLs link to a given domain.

The catch is that the raw data is enormous and not designed for casual use. Querying it directly requires either spinning up cloud infrastructure or knowing your way around large dataset tooling. For most site owners that is not realistic.

Tom's Link Authority solves that by packaging Common Crawl's link graph into queryable SQLite shards you can run locally on Windows. You download the shards for the letters you care about, run the tool against a competitor's domain, and get back a list of linking URLs in seconds — no cloud account, no monthly subscription, no data leaving your machine.

The link graph covers the full 4.4 billion link relationships in the crawl, split across 27 shards by the first letter of the linking domain. A single shard costs $5 per quarter, so if your competitor is in a niche where most linking sites start with a handful of common letters, you can get useful data for a few dollars rather than a few hundred.

Setting up your research

Before you start pulling data, spend five minutes defining what you are looking for. Not all backlinks are equal and not all of your competitor's links are worth pursuing. You are specifically interested in editorial links from real content pages — a site that chose to mention your competitor in the context of an article or resource page. Directory listings, forum profiles, and comment spam are generally not worth targeting because they do not signal genuine editorial endorsement, and many of them carry little to no link value.

Start by identifying two to four competitors. Ideally these are sites that rank for the same keywords you are targeting, are roughly comparable in size and authority to where you want to be, and are in the same niche rather than tangentially related. A direct competitor whose content you could plausibly replace or complement is a better research target than a large authority site in an adjacent space.

Write down your competitor domains before you start. You will be running the same process for each one and comparing the results, so keeping a simple spreadsheet open as you work will save time later.

Running the analysis

With Link Authority installed and the relevant shards downloaded, the process is straightforward. Enter a competitor domain and run the link lookup. The tool returns a list of URLs that include a link pointing to that domain, drawn from the Common Crawl data.

The raw list will include noise — low-quality directories, scraped content aggregators, and sites that no longer exist. Your job at this stage is not to scrub the list clean but to skim it for patterns. Look for recognisable publication names, topic-relevant blogs, resource pages, and industry directories that appear to be maintained. These are your priority targets.

Run the same lookup for each of your competitors. Once you have lists for two or more, you can use the link gap feature to find sites that appear in multiple competitors' profiles but not in your own. A site that links to three of your four competitors is a strong signal — it is actively engaged in your niche and has a clear pattern of linking to relevant sources.

Qualifying prospects before outreach

Not every site on your list is worth approaching. Before you spend time crafting an outreach email, do a quick manual check on each prospect. Open the actual page that contains the link to your competitor and look at a few things: is the content genuinely relevant to your topic, does the site appear to be actively maintained with recent posts or updates, does it have a real audience or does it look like a content farm, and is there a plausible reason they would link to you.

That last question is the one most people skip, and it is the most important. You are not pitching a site on linking to you in the abstract — you are pitching them on a specific reason. The most common reasons that work are: you have a piece of content that covers the same topic more thoroughly or more recently, you have a tool or resource that complements what they already link to, or you have data or original research they might find useful to reference.

If you cannot identify a concrete reason within thirty seconds of looking at the page, move on. Vague outreach emails asking for links have a near-zero response rate. Specific pitches that reference the page you found and explain exactly what you are offering convert far better.

The outreach process

Competitor backlink research gives you a list of qualified prospects, but the work of actually acquiring the links is in the outreach. Keep your emails short, specific, and low-friction. The person you are emailing is busy and has probably received dozens of generic link request emails. The ones that get responses are the ones that demonstrate you have actually looked at their site.

A workable email structure is: one sentence referencing the specific page you found, one sentence explaining who you are and what you have created, one sentence explaining why it would be useful to their readers, and a direct link. That is it. No lengthy introductions, no compliments about what a great site they run, no multiple asks in the same email.

Follow up once after a week if you get no response. If there is still no reply, move on. Chasing unresponsive prospects wastes time you could spend on the next prospect on your list.

Expect a low response rate regardless of how well you write your emails. A conversion rate of five to ten percent on qualified prospects is realistic and actually quite good by industry standards. The math works because the qualification step means everyone on your list is a plausible target — you are not spraying hundreds of cold emails at irrelevant sites.

Tracking your results

Keep a simple record of every site you contact, the date you reached out, whether you got a response, and the outcome. This does not need to be sophisticated — a spreadsheet with five columns is sufficient. The reason to track it is so you can see which types of sites and which outreach angles are converting, and adjust accordingly.

Once a link is live, note the referring domain. Over time you will accumulate a picture of which sites in your niche are genuinely willing to link out versus which ones are link-deaf regardless of what you pitch. That information is useful for future rounds of research — you can prioritise the types of sites that have actually converted for you before.

How often to run competitor research

Backlink profiles change over time. Competitors earn new links, lose old ones, and shift their content strategy. Running a fresh competitor backlink analysis every quarter gives you a steady pipeline of new prospects without turning link research into a full-time job.

The most productive time to run it is when you have a new piece of content worth linking to. Rather than doing outreach speculatively, tie each round of competitor research to a specific asset — a new article, a tool, a guide, or a data resource. That way you always have a concrete answer to the question of what you are pitching.

Over six to twelve months of consistent effort, this process compounds. Each link you earn improves your domain's authority slightly, which makes the next outreach campaign marginally easier, which improves your conversion rate over time. It is slow at the start and accelerates later — which is true of most legitimate SEO work.

What competitor research cannot do

It is worth being direct about the limits of this approach. Competitor backlink research finds you prospects; it does not guarantee links. You will contact sites that never respond, sites that respond but decline, and sites that agree but never actually add the link. That is normal and not a signal that your outreach is broken.

It also will not surface every link your competitors have. Common Crawl does not cover the entire web, and some linking pages will have been crawled before or after the data snapshot. The dataset is large enough to give you a genuinely useful picture of a competitor's link profile, but treat it as a representative sample rather than an exhaustive inventory.

What it does well is give you a structured, data-driven starting point that is significantly better than guessing. Instead of spending time cold-approaching random sites, you are working from evidence of who links in your niche — and that evidence is available without a paid tool subscription.

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