There are no a real good software yet because of many reasons that are related to content analysis and prediction of peoples behavior/desires… So save the money and just start to follow daily the hashtags that are related to your product (best hashtags to followers are ones with less than 1M followers) and see which Influencer influences the most (by number of engagements and love back from followers?). Good idea?
Learn About the Best Tools and Chrome Extensions for Hashtags
Updated Weekly: My Suggested KPIs For Evaluating SMI (Social Media Influencers)
What a Scandal – Third Party Influencer Tools are Still Worthless
SMI* = Social Media Influencers