A/B testing for improving your app look on Appstore and Google Play

Hi guys...I have been using Raisemetrics.com for increasing app conversions by testing icons, descriptions, videos and prices on app store and google play. What other platforms have you guys been using ? I tried splitmetrics, testnest, optimizely but so far raisemetrics is the best! What else do you use to improve your app store?
Thanks!

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