I've had a very good experience in moving from Freestar to AdPushup. There is a lot more personal attention, and their team is dedicated to your success. I'm more than a month in and so far so good. My revenue has increased significantly. I would suggest giving them a try.
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AdPushup is a leading ad revenue optimisation platform by Zelto Inc (erstwhile AdPushup Inc) that helps publishers increase their ad revenue using automated A/B testing, header bidding, innovative ad formats, and AdBlock recovery. We are a Google's Certified Publishing Partner (GCPP) and are backed by Microsoft Ventures.