Do App Store keywords need to be lowercase?

No. App Store search is not case-sensitive, so 'Fitness' and 'fitness' are matched identically — capitalization in the keyword field has no effect on indexing.

This means capitalizing keywords for readability in App Store Connect costs nothing and changes nothing about how they're matched against search queries.

Case does matter for the visible title and subtitle from a branding and readability standpoint, just not for search indexing itself.

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