A: Hi,
From what I can see, the other tool you're mentioning checks for links on other sites.

Our WP 301 Redirects is a plugin that helps you handle redirects primarily, with a lot of options and features, where the Link Checker is just one of the features. The Scanner allows you to check your own site and scan links, so you can find those that need to be redirected or removed; it will find bad links that may hurt your site and/or SEO, etc. Quickly check every outgoing link on your site to determine if it’s broken or leading to malicious sites, so it works quite differently from the other tool you mentioned.