App Store Connect

Apple's developer console. Title, subtitle and keyword field are written here and go live with a version.

This is where metadata lives, and it holds a separate set per storefront. Leaving a country's fields empty means the default language applies there - that is, you are not indexed in that market's own words.

One important constraint: title, subtitle and the keyword field are version-scoped. Changing them means submitting a new version. That is the slowest feedback loop in ASO and it makes changing one variable per version close to mandatory.

rankcusp's measurement side asks for no App Store Connect access; ranking, rival and review data are read from the store's public face. Credentials are needed only to write metadata, reply to reviews and read real install counts.