You can try SplitMetrics.
SplitMetrics is a platform for mobile marketers to A/B test and optimize app store pages for maximum conversion. The world’s largest mobile publishers like Rovio, Rakuten, Wargaming, and hundreds of other companies use SplitMetrics to test their app store pages and optimize conversion.
Hello guys! What A/B testing are you using for optimizing your app look in App Store & Google Play?
I have tried several - optimizley, testnest . I found that the best one, which is free at the moment is raisemetrics.com
What other platforms are out there?