The App Store allows apps to have a main and additional locale (the language and regional settings) for a single country so users can see different app pages based on their device’s language settings. According to Apple’s guidelines, the language of a localized app is determined by:
- The country where the app is available
- The language preferences set by the user
Each country has a set of additional languages (locales) that are indexed for the main locale.
For example, if an app is available in Spain with the main locale set to Spanish (Spain), the App Store also indexes metadata in English (UK) and Catalan for the Spanish market. Localized for China, the app might have the main locale set to Simplified Chinese and those keywords will only be indexed in China, not in Spain.
Why do additional locales matter for ASO?Localization helps expand keyword coverage. While an app’s metadata is limited to 160 characters in the main locale, adding keywords in additional locales allows for:
- Increased keyword capacity (two or three times more than the main locale)
- Higher ranking potential across multiple regions
- Greater discoverability without modifying the main locale
So, how did we apply this to Voyage?For Voyage, we leveraged two additional App Store locales for Russia to expand keyword coverage.
The first was English (UK), which aligned with the developer’s goal of attracting users in the UK. By indexing English keywords, we ensured visibility in both the Russian and UK markets.
The second was Ukrainian, where, instead of using Ukrainian keywords, we strategically replaced them with additional Russian-language keywords. This allowed us to double the app’s Russian keyword coverage, maximizing its reach in the target market.
Results and best practicesUsing additional locales is an effective strategy in many verticals, and it proved right in the Voyage’s case.
- Some keywords were added exclusively in additional locales, yet they still got indexed in the main Russian locale.
- However, for the most frequent and high-value keywords, it is always best to include them directly in the main locale for stronger indexing.
“Using additional locales is effective in many verticals. We added some keys only there. The app was indexed for these in the main one. This happened with the Voyage app as well for some keywords. However, as for the most frequent and relevant keys, it is better to add those into the main one directly.Valery S., ASO Manager at LoveMobile"