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Hello David, There are several great answers here, and I'd like to add one more option. The inbound marketing companies on the Moz Recommended List have all be vetted by Moz.com and should be reputable. If I were going to hire an agency one of the least of my concerns would be which tools they used. Do your research to find out what kind of reputation they have in the industry and trust that they know what they're doing. Good luck!