Free Backlink Checkers Compared — Ahrefs, Moz, Ubersuggest, GSC

Every major SEO tool gives away a limited, rate-capped slice of its backlink data for free — it's a proven lead-gen tactic, and a useful one if you know how to combine several free tiers into something close to a full picture. None of them alone is comprehensive. Stacked together, plus Google Search Console (which is completely free and unlimited, but only for sites you own), they cover most of what a bootstrapped founder actually needs without paying for a subscription.

This guide walks through what each free option actually shows you, where the limits kick in, and how to combine them for the best free result.

Google Search Console: The Best Free Option, With One Big Catch

If you're checking backlinks to your OWN site, Google Search Console (GSC) is the single best free source available, and it's not close. Once you verify your property, the Links report shows every backlink Google has indexed to your site — no sampling, no daily cap, no paywall on deeper results. You can export the full list, see top linking sites, top linked pages, and top linking text (anchor text).

The catch is right there in the setup requirement: GSC only shows data for properties you've verified ownership of. You cannot use it to check a competitor's backlinks, a domain you're considering acquiring, or a vendor's claimed link profile. For your own site, though, there's no better free source — third-party tools are working from their own crawl of the web and will always be sampling a subset of what actually exists; Google is showing you what Google itself has actually indexed.

How to use it: Search Console → Links (left sidebar) → "Top linking sites" and "Top linked pages." Export to CSV if you want to cross-reference against a competitor list pulled from one of the paid-tool free tiers below.

Ahrefs' Free DR Checker

Ahrefs offers a free, no-login Domain Rating checker that returns a site's current DR score plus a sample of its top backlinks. It's rate-limited — you get a capped number of lookups per day — but for a quick "how strong is this domain" gut-check on a competitor or a potential guest-post/directory target, it's genuinely useful and requires no signup at all.

Best for: fast DR comparisons across a shortlist of domains (e.g., vetting a batch of directories or guest-post targets before committing time to outreach).

Limitation: the backlink sample shown is small — it's a taste of Ahrefs' full index, not the whole picture, and daily lookup caps mean you can't run it against a long list in one sitting.

Moz's Free Link Explorer

Moz's free tier of Link Explorer returns a Domain Authority (DA) score alongside a limited list of linking root domains per search. DA is Moz's own metric, calculated differently from Ahrefs' DR (see our DR vs DA comparison for how the two differ), so it's a genuinely separate data point rather than a duplicate of what Ahrefs' checker gives you.

Best for: a second, independent authority score to cross-reference against Ahrefs' DR — useful specifically because Moz's crawler and index are separate from Ahrefs', so it occasionally surfaces links or context Ahrefs' free tier doesn't show.

Limitation: like Ahrefs' free checker, the linking-domains list is capped per search, and Moz's overall link index is smaller than Ahrefs' or Semrush's.

Ubersuggest's Free Tier

Ubersuggest offers a handful of free backlink lookups per day once you create a free account (no payment required for the free tier). It's the lightest-weight of the three paid-tool free tiers, but it's a third independent data point, and Ubersuggest's site-audit feature (also free at a basic level) is a useful bonus if you're checking a domain's overall technical health at the same time.

Best for: a third cross-check when the first two disagree, or a lightweight option if you're already inside Ubersuggest for other reasons.

Limitation: the smallest and least frequently refreshed index of the three, so treat it as a supplementary data point rather than a primary source.

How to Actually Combine These for the Best Free Result

No single free checker is comprehensive, but a simple three-step stack gets you most of the way to a paid tool's usefulness at zero cost:

1. Run the domain through Ahrefs' free checker first — get the DR score and top backlinks sample. This is usually the most complete free single data point available.
2. Run it through Moz's Link Explorer second — cross-check the Ahrefs result against Moz's DA and its own linking-domains sample. Because the two indexes don't fully overlap, this step sometimes surfaces links Ahrefs' free tier didn't show.
3. Run it through Ubersuggest third, if you want a tiebreaker — a lighter third opinion, useful mainly when the first two results seem inconsistent with what you'd expect.
4. If it's your own site, always check Google Search Console too — it's the only source of the three-plus-GSC that isn't sampling, so treat its numbers as the ground truth for your own domain even while using the others for competitor research.

For most quick decisions — is this directory worth submitting to, is this domain worth a guest post, is this competitor's link profile actually stronger than mine — two of the four sources agreeing is usually enough signal to act on. Reserve a full paid-tool audit for higher-stakes decisions (an acquisition, a major link-building budget commitment, a serious disavow-file preparation).

Why the Numbers Never Quite Match

It's worth understanding this clearly so the discrepancies don't cause second-guessing: Ahrefs, Moz, and Ubersuggest each run their own independent web crawler. None of them has indexed the entire web (nobody has), and their indexes overlap only partially. A link that exists on a small or newer site might be crawled by one tool and missed by the others, simply due to differences in crawl scheduling, crawl budget, and which parts of the web each crawler prioritizes.

This means a domain showing DR 45 on Ahrefs and DA 38 on Moz isn't a contradiction — they're two different measurement systems drawing from two different (overlapping but not identical) samples of the actual link graph. Track one consistently over time for trend purposes rather than treating any single score as an absolute truth, and don't be surprised when a "second opinion" tool shows a different number for the same site.

A Worked Example: Vetting Ten Directory Prospects

Say you're researching whether ten specific directories are worth submitting your product to — a realistic task if you're weighing DIY submission against a done-for-you service. Here's how the free-tool stack works in practice:

1. Run all ten domains through Ahrefs' free checker. In a few minutes you'll have a rough DR for each, which immediately separates the DR 70+ heavyweights from the DR 15 low-value listings.
2. Spot-check the top five through Moz's Link Explorer. For the domains that looked strongest in step one, a second DA reading either confirms the read or flags a discrepancy worth a closer look.
3. Check Ubersuggest for any domain that seems off. If a directory claims to be high-authority but both Ahrefs and Moz show modest numbers, a third check either resolves the doubt or confirms it's worth skipping.
4. Cross-reference against real submission notes, not just the score — a directory's dofollow/nofollow status, whether it actually gets crawled and indexed, and how relevant its audience is to your category all matter as much as the raw authority number. This is exactly the kind of vetting that goes into maintaining a directory database rather than relying on a score alone.

This whole process takes maybe twenty minutes for ten domains and costs nothing — a reasonable trade of a little time for a genuinely useful filter before deciding where to spend submission effort (yours or a service's).

Free Tools vs. What a Curated Directory Database Adds

There's a difference between checking whether a directory has authority and knowing whether it's actually worth submitting to. A directory can have a respectable DR and still be a poor fit — low relevance to your category, a nofollow-only link policy, a submission process that takes rejections without explanation, or an audience that never converts. Free backlink checkers tell you the authority number; they don't tell you submission difficulty, approval rates, or which directories in a given niche are actually worth your time versus which ones are just there.

That's the gap a maintained, filterable directory database closes — not by replacing the authority check, but by adding the context (dofollow/nofollow, pricing, category fit, how-to-submit notes) that authority alone doesn't capture.

When It's Time to Pay

Free tiers cover casual, occasional lookups well. They start to break down when you need:

• Complete backlink lists, not samples — free tiers cap results per search, which is fine for a quick check but insufficient for building a full link-gap analysis against multiple competitors.
• Historical trend data — seeing how a domain's link profile changed over months or years, which the free tiers generally don't expose.
• Bulk lookups — checking dozens or hundreds of domains at once (e.g., vetting a large directory list), which daily free-tier caps make impractical.
• Export and reporting features — free tiers rarely let you export full datasets for client reporting or deeper analysis.

If you've hit one of those walls, that's the point where a paid subscription to Ahrefs, Semrush, Moz Pro, or SE Ranking starts paying for itself in saved time rather than being an unnecessary expense.

Where BacklinkBot Fits

Checking backlinks — free or paid — tells you what already exists. It doesn't build anything new. BacklinkBot is a done-for-you directory submission service: we manually submit your product to 100-300+ real, indexed directories from our own database of 1,011+, and you get a full report with a live proof link for every placement. Once those links go live, any of the free checkers above (or GSC, once Google's crawled them) will show them.

Our own free Domain Rating checker adds a fourth no-login data point, pulled from Ahrefs' public API, if you want one more quick read before deciding whether a paid subscription is worth it. And if you're weighing whether to build links yourself or have them done for you, our DIY vs done-for-you comparison breaks down that trade-off directly.

Quick Reference

For a fast recap of when to reach for which free source: use Google Search Console for anything about your own site's real, unsampled link data. Use Ahrefs' free checker as your first stop for any external domain, since it's typically the most complete single free data point. Add Moz's Link Explorer as a cross-check when the decision matters enough to warrant a second opinion. Keep Ubersuggest in your back pocket as a tiebreaker or when you're already using it for other free SEO checks. None of this costs anything, and combined, it covers the large majority of what a bootstrapped founder needs before a paid subscription becomes worth the money.