What is Spam Score and How to Check It for Free

What is Spam Score?

Spam Score is a proprietary metric developed by Moz that estimates how likely a website is to be penalised or associated with manipulative practices. It is expressed as a percentage from 1 to 100, where a lower number is better.

Moz calculates Spam Score using 18 spam signals that correlate with patterns found on websites that have received Google penalties. These signals include technical factors like domain length, SSL status, top-level domain type, and linking patterns such as the ratio of external to internal links. No single signal is enough to indicate a spam site on its own. It is the accumulation of multiple spam signals together that produces a high Spam Score.

The risk interpretation broadly follows three ranges. A score of zero to 30 percent indicates low risk and suggests the site is likely trustworthy with minimal spam signals. A score of 31 to 60 percent indicates medium risk and suggests some spam indicators may be present, though the site is not necessarily problematic. A score of 61 to 100 percent indicates high risk and suggests significant spammy characteristics that warrant careful review before using the site as a link source.

Understanding what Spam Score is, and critically what it is not, is essential for real estate businesses using it as a link quality filter.

What Spam Score Is Not

Two critical limitations of Spam Score must be understood before using it in real estate link building decisions.

Spam Score is not a Google metric. Google does not use Moz’s Spam Score in its ranking algorithm, and Google has not confirmed any relationship between Moz’s Spam Score and how Google evaluates a site. Spam Score is Moz’s own estimate of spam risk based on patterns Moz has identified in its own research. A site with a high Spam Score may be perfectly legitimate and carry genuine authority in Google’s evaluation. A site with a low Spam Score may still be a low-quality or manipulative site that passes Moz’s signal checks without exhibiting the specific patterns Moz uses for its calculation.

Spam Score is not a definitive quality indicator. Some entirely legitimate websites have elevated Spam Scores because of characteristics that Moz’s signals flag as potentially spammy but that are actually benign in context. A regional property news site with a large number of outbound links to property listings may score moderately on Spam Score because of its linking pattern, even though it is a genuine editorial publication with a real audience. A high Spam Score on an otherwise authoritative site with good domain authority, real traffic, and relevant content does not mean the site is unsuitable as a link source.

How Moz Calculates Spam Score

Moz’s Spam Score is calculated using 18 specific signals derived from analysis of sites that have been manually penalised by Google. Rather than trying to replicate Google’s algorithm, Moz identified the characteristics that were disproportionately common on penalised sites and built those into its spam signal model.

The signals fall into several categories. Technical signals include factors like domain length, because spammers disproportionately use long or unusual domain names, and SSL status, because low-quality sites historically have lower SSL adoption rates. Linking pattern signals include the ratio of external to internal links, because sites built primarily for outbound link hosting often have very few internal links and very many external ones. Content signals include page count patterns and content characteristics that correlate with thin or auto-generated content.

Moz refreshes its index roughly monthly, which means Spam Score updates reflect changes from the previous month rather than current site status. If a site has recently cleaned up a toxic backlink profile or improved its content quality, those improvements will not appear in Spam Score until the next Moz index refresh.

How to Check Spam Score for Free

Several options allow real estate businesses and link building agencies to check Spam Score for potential link sources without paying for a Moz subscription.

Moz Link Explorer free tier at moz.com/link-explorer provides three free domain analysis reports per day. Each report shows the domain’s Spam Score alongside Domain Authority, Page Authority, and basic backlink metrics. This is the most accurate source for Spam Score because it comes directly from Moz’s own platform. Three reports per day is sufficient for individual checks on specific sites before pitching outreach.

Moz Bar browser extension is a free Chrome extension from Moz that shows Spam Score and Domain Authority for any website you visit. It is useful for quickly checking the Spam Score of potential link sources as you browse them during outreach prospecting, without needing to run individual searches.

Keywords Everywhere Spam Score Checker at keywordseverywhere.com/tools/spam-score-checker provides Spam Score checks using Moz’s data. It mirrors Moz’s data after each monthly refresh and offers bulk checking functionality, which is useful for auditing a list of outreach targets simultaneously.

Rankchase Spam Score tool and similar third-party tools that use Moz’s API provide free checks with varying daily limits. These are useful for bulk checking when you need to evaluate more than three sites per day without a paid Moz subscription.

For real estate link building agencies managing multiple campaigns, a paid Moz subscription provides unlimited Spam Score checks alongside fuller backlink analysis and site audit functionality. However, for most individual real estate businesses checking the quality of specific outreach targets, the free tier options are sufficient.

How to Use Spam Score in Real Estate Link Building

Spam Score is most useful as a quick filter during the outreach prospecting process, not as a definitive quality gate that determines whether a site is acceptable as a link source.

The practical workflow for using Spam Score in real estate link building quality assessment involves three steps. First, identify a potential link source through competitor backlink analysis, Google search, or a publisher network. Second, check the site’s Spam Score using one of the free tools above. Third, combine the Spam Score with organic traffic data and a manual content quality check to make a holistic quality assessment.

A site with a Spam Score below 5 percent and genuine organic traffic and relevant property content is a strong link source candidate. A site with a Spam Score below 30 percent and good Domain Authority is generally acceptable for link building even if the Spam Score is not at the lowest end. A site with a Spam Score above 60 percent warrants careful review, but not automatic rejection. If the site has a high Spam Score alongside very low organic traffic, thin or auto-generated content, and an obviously commercial link-selling structure, it is likely unsuitable regardless of its domain authority metrics.

The combination of Spam Score with organic traffic is more reliable as a quality signal than either metric alone. A site with a Spam Score of 8 percent and zero organic traffic has likely inflated its metrics through link manipulation. A site with a Spam Score of 35 percent and 20,000 monthly organic visitors from UK property audiences is probably a legitimate publication with some link pattern characteristics that elevated its Moz score without indicating actual spam risk.

Spam Score Thresholds for Real Estate Link Vetting

Based on the risk ranges Moz defines and the practical experience of real estate link building campaigns, the following thresholds provide a useful starting framework for quick Spam Score assessments.

Sites with a Spam Score of zero to five percent are the most straightforward to approve as link sources, assuming the rest of their metrics and content quality are appropriate. These sites exhibit very few of the signals Moz associates with spam and are unlikely to carry penalty risk for the real estate websites that earn links from them.

Sites with a Spam Score of six to 30 percent are generally acceptable for real estate link building. This range includes many legitimate publishers that have slightly elevated Spam Scores due to benign characteristics like high external link counts on resource pages or specific domain name features. Review organic traffic and content quality alongside the Spam Score before accepting these sites.

Sites with a Spam Score of 31 to 60 percent require manual review. Do not reject them automatically, but check the specific characteristics contributing to the elevated score. A legitimate regional property news site might sit in this range due to its external linking patterns, while a genuine link farm might also sit here. Traffic data, content quality, and manual site inspection are the deciding factors.

Sites with a Spam Score above 60 percent should be approached with significant caution. Most sites in this range exhibit multiple serious spam signals that make them risky as link sources for real estate websites. The exception is if the site has substantial organic traffic, clear editorial content, and an obvious explanation for the elevated Spam Score that does not indicate manipulation.

Spam Score vs Spam Score: The Email Confusion

One important clarification for real estate businesses evaluating link source quality: the SEO Spam Score from Moz is completely different from email domain reputation scores used to evaluate whether outreach emails land in recipients’ inboxes.

Some guides conflate these two distinct metrics, causing confusion about which tool to use for which purpose. Moz’s Spam Score evaluates a website’s backlink profile risk. Email domain reputation scores from tools like Google Postmaster Tools evaluate whether Gmail trusts the email domain enough to deliver messages to the inbox rather than the spam folder.

For real estate link building outreach, these are two separate concerns. Moz’s Spam Score tells you whether a potential link source carries penalty risk. Google Postmaster Tools tells you whether your outreach emails are being delivered to the editors you are trying to reach. Both matter, but they measure completely different things and require different tools to evaluate.

Frequently Asked Questions

Using Spam Score Effectively in Real Estate Link Quality Assessment

Spam Score is a useful tool when used correctly as part of a broader quality assessment process. It provides a quick first-pass indication of whether a potential link source exhibits characteristics associated with spam patterns, which can flag sites for more detailed manual review or confirm that a site is clean enough to proceed with outreach.

The mistake that reduces Spam Score’s usefulness is treating it as a binary gate that either approves or rejects a link source automatically. Used alongside organic traffic data, Domain Authority, manual content quality assessment, and topical relevance evaluation, Spam Score adds a meaningful signal to the overall picture of a site’s quality without carrying the full weight of a decision that several factors should inform.

At The Core SEO, Spam Score is one of the checks in our publisher vetting process for real estate link placements. We combine it with organic traffic verification, content quality assessment, and topical relevance evaluation to ensure every placement site meets the quality standards that produce genuine ranking benefit for our real estate clients.

Talk to us about how we vet real estate link sources for quality and safety.