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Articles about app store optimization from the mockiso blog: device mockups, app store screenshots and launch tips.
Most App Store screenshot rejections come from a few fixable mistakes: splash or login screens instead of the app in use, prices or "free" claims, other-platform imagery, real user data, and wrong sizes or transparent PNGs. Google Play adds bans on rankings, awards and promo text.
To submit an iPhone app, App Store Connect requires at least one screenshot for the 6.3-inch Dynamic Island class (1206 × 2622 or 1179 × 2556 px), plus a 13-inch iPad set (2064 × 2752 or 2048 × 2732 px) if your app runs on iPad. You can upload 1–10 JPEG or PNG images per size.
An App Store preview video is a 15–30 second screen recording of your app that autoplays muted on your product page. Upload up to three per device size and language, at an exact accepted resolution like 886 x 1920 px, max 30 fps and 500 MB.
A Google Play feature graphic must be a 1024 × 500 px JPEG or 24-bit PNG with no alpha channel. Keep the focal point centered, use vivid colors, skip device imagery and words like "#1" or "Free," then A/B test it in Play Console.
Good App Store screenshot captions are short, benefit-led headlines of roughly 3–7 words. They are set large and in high contrast, written for one idea per screenshot and localized for every market. On Google Play, keep taglines under 20% of the image and leave out calls to action.
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