Most "free backlink checkers" show a big number and stop there. Here is the 10-minute routine I actually use to judge a site's link profile (works with any tool; I'll use the free Nuqti backlink checker since that's what I work on).
1. Ignore total backlinks, look at referring domains (RD) 1 site linking from every footer = thousands of "backlinks" but 1 RD. RD is the number that correlates with rankings.
2. Check the RD trend, not just the count Steady growth = healthy. A spike of hundreds of RD in a week from unrelated sites = often bought links or a scraper network. A sudden drop = links lost (site migration, expired guest posts).
3. Read the anchors Healthy: mostly brand name, naked URL, generic ("here", "website"). Red flag: a large share of exact-match money keywords ("best cheap shoes").
4. Dofollow vs nofollow share A natural profile has a mix. 100% dofollow from blogs is suspicious; 100% nofollow means most links are social/forums/directories.
5. Look at the top 10 linking domains by hand Open them. Are they real sites with real traffic and a topic related to yours? Ten good ones beat a thousand directory listings.
6. Compare with 2-3 competitors ranking above you The gap in RD (and which sites link to them but not you) is your outreach list.
Any number you see in a tool, including ours, is a sample of the web, not the full truth. If two tools disagree a lot on RD, trust the trend and the quality checks above over the raw count.
What's your quick red-flag check when you look at a link profile?
Source: r/NuqtiSEO · by /u/North_Pomegranate545