Learn how to optimize App Store and Google Play screenshots: first-frame promise, benefit-led captions, real UI proof, localization, testing, export rules, and the AppScreens editable-project workflow. First-screen benchmarks cite 72% of iOS product page sessions ending without scrolling, 90% of users not scrolling past the third screenshot, and only 1% reading the full description across SplitMetrics experiments. ASO testing examples range from about +4% to +61%, a +15% win is roughly 1,500 extra downloads at 10,000 monthly downloads, screenshot benchmarks cite a median winning lift around +11.8% conversion, and localization examples report +101% to +128% more downloads.