Most apps make a real effort

The average app shows 5.8 of its ten possible screenshots, so the typical listing is more than half-full. Presenting yourself properly is the norm, not the exception: most developers understand the gallery is the pitch and fill a solid stretch of it with captioned frames and feature highlights.

It is the extremes that are telling

The interesting apps sit at the two ends. 8.3% use every one of the ten slots, almost always the heavily-marketed games and subscription products that treat the listing as a conversion funnel. At the other end, 11.9% skimp with three or fewer, a mix of genuine minimalists and neglected listings that were set up once and never revisited. A near-empty gallery is a small red flag; a maxed-out one signals an app someone is actively selling.

The bottom line

Read screenshots as marketing, not documentation. A polished, full gallery tells you an app is well-resourced and wants your download; a lone blurry screenshot often signals a hobby project or a listing left to rot. Neither guarantees the app is good, but combined with the rating count and last-updated date, the effort in the shop window is a useful part of the picture.