Over 700 keyword ideas based on a single keyword
If you are looking for long-tail keywords, Keyword Tool will help you find relevant opportunities. The free version of Keyword Tool generates up to 750+ long-tail keyword suggestions for every search term although it offers very little additional functionalities for free. To generate long-tail keyword suggestions, Keyword Tool uses your search term, places it into Google search box and pulls out keyword suggestions. With the paid version, you can also access the search volume, CPC and AdWords competition for each suggestion.
Completely free :)
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