Should I use the same keywords across all my App Store storefronts?

No — even within the same language, popularity and difficulty vary enough by storefront that a keyword set optimized for one market is rarely optimal, and often outright wrong, for another.

This is true even between storefronts that share a language: US and UK English, or Spain and Mexico Spanish, routinely show different difficulty for identical terms, and sometimes different vocabulary preferences entirely.

Score your core concept list separately per storefront rather than copying one market's finished keyword set into every other market's metadata. The research cost is a batch lookup per storefront, which is small compared to the cost of a mismatched keyword set sitting live for months.

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