Google Keyword Planner measures the keyword competitiveness by calculating "the number of advertisers bidding on each keyword relative to all keywords across Google" - according to the big G. However, I find this measurement way is suitable for ones who use Google Adwords, not for SEO-ers. Other software has the measurement function, too. For example, you have to pay 17$/mo in order to get Long Tail Pro calculate the competitiveness (Platinum features). Does paid software measure the competitiveness the same way as GKP does ? I have heard somewhere that those software takes information by crawling from GKP... Since I haven't purchase any paid software yet so I cannot test the function myself. Anyone has an idea ?