SEMrush is so feature rich it's like your most favorite desert and after dinner drink all in one - with second helpings included! The keyword data, the social posting tool, the competitor data and more is simply incredible. The training tools, special webinars, and all the support SEMrush offers clients is of tremendous value over and above all its functionality as an SEO/SEM tool.
SEMRush is one of the best solutions I have found for discovering site errors, getting a great explanation on how to fix it, and even posting for social media. It covers end to end so many of the varied areas of SEO, that it's become an invaluable part of my business. My favorite has been utilizing the ranking tools to see how we compare against competitors, and also tips on getting featured snippets (which we achieved for one client this year!)
I am using SEMRUSH for the last 3 months and found it the best keyword research online tool which every blogger and internet marketers should use. Especially after they add Indian data on their database, more and more Indian webmaster are using this amazing keyword research tool. But, in my opinion they still need to do some improvement in it, especially with the User-Interface which is cumbersome for a new webmaster.
Keyword Tool is the best YouTube keyword tool alternative. It uses YouTube autocomplete feature to generate highly relevant long-tail keywords about a particular topic. YouTube autocomplete, just as Google autocomplete, was created to make the user experience better. It helps users find videos faster by recommending related keywords when they start typing in their search query.