What is the Best Keyword Tool?

Please share your experience with a keyword tool you've used. Below I've listed all the keyword tools I've used to rank for long tail keywords and had success with.

Keyword Research Tools I've Used

AnswerThePublic – I use this to discover what people are asking about and get instant, raw search insights, direct from the minds of customers. ( great for finding long tail keywords )

Jaaxy – I curreent use Jaaxy Lite and research platform that was developed by affiliate marketers for...

What is the Best Keyword Tool?