App Store screenshot guides
The reference material we kept needing ourselves: the exact sizes Apple accepts in 2026, why App Store Connect rejects PNGs that look fine, and how the screenshot tools on the market actually compare.
Updated July 2026
Reference
App Store screenshot sizes (2026)
Every accepted dimension by device class, how many screenshots per locale, the ordering rule, and the naming trap between the App Store Connect API and the asc CLI.
Troubleshooting
Fixing IMAGE_ALPHA_NOT_ALLOWED
Why App Store Connect rejects a PNG whose pixels are all opaque, and the two ways to re-encode it so the upload goes through.
Roundup
Best App Store screenshot generators
The tools people actually weigh against each other, compared on the same criteria, with a verdict by buyer type.
Comparisons
ScreenshotPunch vs the alternatives
Head-to-head comparisons against AppLaunchpad, Previewed and AppMockUp Studio.
Skip the fixing — get screenshots that are right from the start
ScreenshotPunch generates your whole App Store set from your raw screenshots: art-directed layouts, headlines in every locale, exact 1320×2868 exports with no alpha channel. Pick a style and it builds the rest.