Ahrefs Backlink Checker - With the world's biggest index of live backlinks (over 15 trillion), Ahrefs Backlink Checker will show you the most complete backlink profile for any website.
Holly Website Audit - Free, brandable website audit for your potential clients
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
Website Grader - Grade your website's strengths and weaknesses in seconds.
Toxic Backlink Checker - Find out what's lurking in your backlink profile.
Website Speed Ranker - Compare how fast your website loads vs your competitors