Game Play Console (Android)
When I publish apps I use the following screenshot sizes: Phone: 1080 x 1920 Tablet 7": 1200 x 1920 Tablet 10": 1800 x 2560
App Store (iOS) Screenshots
iPhone 6.5 inch : 1242 x 2688 pixels
iPhone 5.5 inch : 1242 x 2208 pixels
iPad 12.9 inch : 2048 x 2732 pixels
App Store (iOS) Previews
iPhone 6.5 inch : 886 x 1920 pixels
iPhone 5.5 inch : 1080 x 1920 pixels
iPad 12.9 inch : 1200 x 1600 pixels
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