The headline number every vendor advertises—trillions of links—is the least useful thing about a backlink checker. What matters is how fresh the index is, how cleanly it scores link quality, and whether you can filter to the few hundred links that actually move rankings. Our top pick is Ahrefs, with an SR Score of 92, for a fast-refreshing crawl and the cleanest link data we tested. If you want backlinks bundled with keyword research and audits, Semrush (89) is the better all-rounder. For pure, affordable link analysis, Majestic (86) still earns its place.
The ranking
| Rank | Tool | Best for | Entry price | SR Score |
|---|---|---|---|---|
| 1 | Ahrefs | Freshest crawl + clean data | Starter ~$129/mo | 92 |
| 2 | Semrush | Backlinks inside a full suite | Pro $139.95/mo | 89 |
| 3 | Majestic | Affordable pure link analysis | Lite $49.99/mo | 86 |
| 4 | Moz Link Explorer | Brand-trust + Domain Authority | Standard ~$99/mo | 82 |
| 5 | Semrush free checker | Free spot checks | Free | 74 |
| 6 | Ahrefs Webmaster Tools | Free audit of your own site | Free (verified) | 73 |
Methodology
The Tool Score v2026 rubric weights five criteria summing to 100:
- Index size & freshness (30) — how much of the link graph the tool sees and how often it refreshes.
- Link quality metrics (25) — strength, trust, and spam scoring you can sort and trust.
- Value for money (20) — referring-domain coverage and limits at a realistic plan.
- Reporting & filters (15) — segmentation, anchor and link-type filters, exports.
- Transparency (10) — published pricing, honest data-source notes, clear limits.
Freshness and quality metrics carry the most weight because a stale or noisy index sends you chasing dead links. Re-weight freely: push Value to 30 and Majestic climbs.
Ahrefs
Ahrefs runs one of the most active crawlers in the industry, re-crawling popular pages on a roughly 15-minute cadence and surfacing new and lost links quickly. The Starter tier lists around $129/month; Standard is about $249/month and unlocks more historical data and exports. Its link database is reported at 35+ trillion links. The interface is built for link work: Referring Domains, anchor distribution, link-type filters, and a clean “best by links” view.
| Criterion | Score |
|---|---|
| Index size & freshness | 29/30 |
| Link quality metrics | 23/25 |
| Value for money | 16/20 |
| Reporting & filters | 14/15 |
| Transparency | 10/10 |
Trade-off: no free trial, and credit-style limits on lower tiers fill quickly during heavy audits.
Semrush
Semrush reports the largest raw index at 43+ trillion discovered links and folds backlinks into a full marketing suite. The Pro plan is $139.95/month; Guru is $279.95/month. Backlink Analytics, the Backlink Audit tool with a 50+ marker Toxicity Score, and real-time new/lost alerts are all here. You buy the whole platform and links are one strong module.
| Criterion | Score |
|---|---|
| Index size & freshness | 27/30 |
| Link quality metrics | 22/25 |
| Value for money | 16/20 |
| Reporting & filters | 14/15 |
| Transparency | 10/10 |
Trade-off: suite pricing is steep if you only want backlink data.
Majestic
The original link-only specialist. Lite is $49.99/month and Pro is $99.99/month. Majestic’s Trust Flow and Topical Trust Flow remain the sharpest quality signals for spotting genuinely authoritative referring domains, and the Fresh/Historic index split is unique—the Historic Index reaches back to 2006.
| Criterion | Score |
|---|---|
| Index size & freshness | 24/30 |
| Link quality metrics | 24/25 |
| Value for money | 19/20 |
| Reporting & filters | 12/15 |
| Transparency | 9/10 |
Trade-off: the interface is dated and there is no keyword or rank-tracking layer.
Moz Link Explorer
Moz Pro Standard is about $99/month and includes Link Explorer with Domain Authority, the metric many marketers still report to clients. The data set is competent and the UI is the friendliest here, but crawl freshness and discovery trail Ahrefs and Semrush.
| Criterion | Score |
|---|---|
| Index size & freshness | 22/30 |
| Link quality metrics | 21/25 |
| Value for money | 16/20 |
| Reporting & filters | 12/15 |
| Transparency | 10/10 |
Trade-off: DA is a Moz model, not a Google metric—useful for comparison, not gospel.
Semrush free backlink checker
Semrush offers a free, login-optional backlink checker that returns a domain’s authority score and a capped list of referring domains. Good for a quick competitor peek; the row limits make it unsuitable for a full audit.
| Criterion | Score |
|---|---|
| Index size & freshness | 24/30 |
| Link quality metrics | 18/25 |
| Value for money | 18/20 |
| Reporting & filters | 6/15 |
| Transparency | 8/10 |
Trade-off: hard row caps; you will hit a paywall on any serious analysis.
Ahrefs Webmaster Tools
Free for sites you verify, AWT gives you the full backlink profile of your own properties plus a site audit. It is the best free option for auditing what you own—but it will not show you a competitor’s links.
| Criterion | Score |
|---|---|
| Index size & freshness | 27/30 |
| Link quality metrics | 22/25 |
| Value for money | 19/20 |
| Reporting & filters | 9/15 |
| Transparency | 9/10 |
Trade-off: limited to verified properties; no competitor lookups.
Verification
- Ahrefs — Starter/Standard pricing, crawl cadence, and index figure verified on ahrefs.com/pricing and Ahrefs data pages.
- Semrush — Pro/Guru pricing, Backlink Audit Toxicity Score, and 43T index figure verified on semrush.com.
- Majestic — Lite/Pro pricing and Fresh/Historic index split verified on majestic.com.
- Moz — Standard pricing and Link Explorer/DA verified on moz.com.
- Semrush free checker — availability and row caps verified on semrush.com/software/backlinks.
- Ahrefs Webmaster Tools — free-for-verified terms verified on ahrefs.com.
Related rankings
- Best Backlink Monitoring Tools 2026: 6 Scored
- Best Broken Link Building Tools 2026: 7 Scored
- Best Link Building Tools 2026: 7 Platforms Scored
- Best Link Building Tools for Agencies 2026
Frequently asked questions
- What is the best backlink checker in 2026?
- In our scoring, Ahrefs takes the top spot for its fast-refreshing index and clean link data, with Semrush a close second on raw index size. Any single tool only sees part of the web's link graph, so cross-check with a second index for high-stakes audits.
- How big are these backlink indexes?
- Vendors publish very large numbers: Semrush claims 43+ trillion discovered links, Ahrefs 35+ trillion, and Moz 40+ trillion. Majestic splits a Fresh Index (refreshed continuously) from a Historic Index dating to 2006. Treat headline counts as marketing; what matters is freshness and overlap with your real profile.
- Do I need a paid backlink checker?
- For a verified site you can use Ahrefs Webmaster Tools, Semrush's free checker, and Google Search Console for free. Paid tiers are worth it for competitor analysis, full referring-domain lists, and historical data.
- Why do two tools report different backlink counts?
- Each tool crawls the web independently and de-duplicates differently. Overlap between any two indexes is partial, so counts diverge. Watch trends inside one tool and use a second only to catch links the first missed.