Write an app store listing

Help me write an app store listing.
Inputs: app; audience; keywords; store.

1. Organize titles and descriptions around core tasks.
2. balance natural copy and keywords.
3. verify screenshot claims, locale fit and platform limits.

Deliver: Positioning, App Store, Google Play, Screenshot captions, Checks.
Clarify critical gaps, separate facts from assumptions, and do not invent data, citations or completed actions.

My material: [fill in here]

Before you start

Provide app; audience; keywords; store.