A spam score checker can be used for many purposes and some periodic users are listed down.

Webmasters
Webmasters use this backlink spam checker to check domain spam score and backlinks spam score.

Bloggers
Bloggers have to check the spam score of websites before taking a backlink from those sites. They can also determine the quality of their backlinks by using this tool.

SEO executives
Being an SEO executive it’s essential to keep an eye on the quality of your websites. By Checking the spam score you can find out the spam score of your domain and the quality of the backlinks.

Writers
Many times content writers have a need to check the spam score of the website just to ensure the quality of the website and its content. So they can contribute their article to authoritative sites.