Is there a way to upgrade to a "pro" version of keyword tracker that will let you check your keywords more than once every 24hours? I don't think there is, but I just wanted to make sure.
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It depends on your number of keyword you are tracking. The tracker works off the Google API which allows for 1000 queries basically every 24 hours. I generally do not use all 1000 queries at one time; hence I can go back and run again or manually check special ones. Once ever 24 hours seems sufficient for me.