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Optimizely - A/B testing you'll actually use.
App Store Inspiration - Best iOS App icons, screenshots, landing pages & heatmaps
SplitMetrics - SplitMetrics is the A/B testing platform for App Store and Google Play page to discover the most converting icons, screenshots, video, etc.
App Icon Template - Royalty free app icon creator for iOS, OS X and Android
Evolv - Evolv is the visual editor for web-based projects that are used to find better ways to connect with customers in order to improve marketing economics.
Bjango App Icon Templates - App icon templates for PS, Ai, Sketch and Affinity Designer