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App previews that earn the install: specs, rules and craft

A practical guide to App Store app previews: duration limits, autoplay rules, story structure, and the craft that turns a 30-second video into installs.

Your app preview is the first thing people actually watch on your product page — and often the only thing. It autoplays the moment your listing appears, before a single line of your description gets read. Fifteen to thirty seconds, muted, on a small screen, in a search results list full of alternatives: that is the whole arena. Get those seconds right and the preview earns installs on its own. Get them wrong and the most expensive asset on your page becomes decoration.

This guide covers the rules Apple actually enforces, a story structure that fits the format, and the craft details that separate a forgettable preview from one that converts. We build Mockpose, an in-browser studio that turns a screen recording into a cinematic 3D device video, so we'll point out where it helps — but the advice stands on its own.

Know the rules before you storyboard

App previews run between 15 and 30 seconds, and Apple enforces the range strictly: a cut that lands outside it simply won't be accepted. Plan the story for the slot from the first storyboard instead of trimming a longer film afterwards — a preview is not a compressed trailer, it's a format of its own.

Just as important: Apple expects a preview to primarily show the app itself in action. Real captured footage of your UI should be the core of the video, with device frames, camera moves and text overlays in service of the app rather than in place of it. The guidelines evolve, so check Apple's current App Preview documentation in App Store Connect before you submit.

Design for sound-off

Previews autoplay muted in search results and on the product page. That single fact should shape every creative decision:

  • The first 3–5 seconds and the poster frame do most of the work. Pick a poster frame that reads as a promise, not a random UI state.
  • Every message has to land visually. If your music or voiceover carries meaning, most viewers will never receive it.
  • Text overlays must stay readable at thumbnail size — short lines, generous type, high contrast.

Sound is still worth doing well, since some viewers do tap to unmute. Treat it as a bonus layer, never the backbone.

A structure that fits 30 seconds

  1. Hook, 0–5 seconds. Open on your strongest screen — the moment that makes people get it. No logo cards, no slow fades, no "welcome to".
  2. Two or three core moments. Show one flow done well rather than ten features at speed. Each beat should complete a thought: tap, result, payoff.
  3. Identity, the last 2–3 seconds. Close on your app name and icon, so whoever watched to the end knows exactly what to install.
The most common mistake is a preview that spends its first ten seconds warming up. In this format, the intro is the film.

One flow, told well

A preview that follows a single journey — open the app, do the thing, see the result — is easier to follow and easier to remember than a montage. Resist the checklist instinct: viewers don't install feature lists, they install outcomes. If your app has several strong flows, the App Store lets you upload multiple previews per device; give each flow its own video instead of cramming them into one.

Localize for your top markets

A preview in the viewer's own language reads faster and feels like it was made for them. At minimum, localize your text overlays for your top markets; when the UI itself is localized, capture the recording in that language too. It's routine work, which is exactly why so few developers do it — and why it stands out.

Where Mockpose fits

We built Mockpose so this entire pipeline lives in your browser:

  • Drop a real screen recording onto a 3D iPhone or iPad — it becomes a clip you can trim and fade, synced to your shot.
  • A keyframe timeline with deterministic playback: every export is frame-identical, so what you preview is exactly what you ship.
  • Cinematic camera moves that keep the screen — your app — as the subject.
  • Exports honor exact App Store preview durations (a 30-second preview exports as exactly 30 seconds) and the required output sizes.
  • Localized text variables let you export one preview per language from a single project.
  • MP4 export up to 4K/60 fps, encoded locally in the browser — no upload, no render farm.

Mockpose is free to try at 720p with a small watermark; premium unlocks full resolution. If you're starting from a raw capture, our guide to turning a screen recording into an app preview covers that first step in detail.

Your next preview is one clean recording away. Capture your best flow, open Mockpose, and build an app preview that earns the install — right in your browser.