Short list of the most popular keyword research tools:
- Overture – free, powered from Yahoo! search data. Heavily biased toward over representing commercial queries, combines singular and plural versions of a keyword into a single data point.
- Google – free, powered from Google search data.
- Wordtracker – paid, powered from Dogpile and MetaCrawler. Due to small sample size their keyword database may be easy to spam.
Please note that most keyword research tools used alone are going to be highly inaccurate at giving exact quantitative search volumes. The tools are better for qualitative measurements. To test the exact volume for a keyword it may make sense to set up a test Google AdWords campaign.
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