Explore Keywords is described as 'The Ultimate Free Keyword Research Tool for checking long tail keywords, marketing keywords, keyword volume, question keywords, unlimited keywords, instant keywords and youtube keywords'. There are more than 10 alternatives to Explore Keywords, not only websites but also apps for SaaS, Google Chrome, Mac and Windows. The best alternative is Google Search Console, which is free. Other great sites and apps similar to Explore Keywords are Moz (Paid), Semrush (Paid), ahrefs (Paid) and KWFinder (Freemium).
Google Webmaster Tools provides you with detailed reports about your pages' visibility on Google. See how Google crawls and indexes your site and learn about specific problems we're having accessing it.