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App Store screenshot size reference
Choose a platform and get the current upload constraints, recommendation thresholds, and official source.
Storyboard
Give every frame a job.
Specifications change and store consoles can show additional compatible sizes. Confirm the live requirement before delivery.
How to use the result
Mechanics are the floor.
Use the output to remove preventable errors. Then return to the harder editorial question: does this listing describe a product the right person will understand, trust, and want?