Crowdin SDK allows delivering new translations from the Crowdin project to your application immediately. Using integration with Crowdin SDK there will be no need to update the application in App Store every time there is a new localization version.

The integration provides:

Over-The-Air Content Delivery – the localized files can be sent to the application from the project whenever needed Real-time Preview – all the translations that are done via Editor can be shown in the application in real-time Screenshots – all screenshots made in the application may be automatically sent to your Crowdin project with tagged source strings


Requirements to integrate an iOS application with a project in Crowdin:

Development Tool

  • Xcode version 10.2+

App Programming Language

  • Swift version 4.2+

Operating System

  • iOS version 9.0+

Distributions and Releases

Distribution is a CDN vault that mirrors the translated content of your project and is required for integration with an iOS app.

Follow these steps to configure distribution:

  1. Open the needed project and go to Project Settings > Content Delivery. Over-the-Air Content Delivery Also, you can press Get Credentials button to check the details required for the OAuth application while connecting Crowdin SDK. Over-the-Air Content Delivery

  2. Add new distribution using Add Distribution button. Choose only the files, translations for which you want to be shown in your application and click Next. Over-the-Air Content Delivery

  3. Copy distribution hash so you can use it for integration. Over-the-Air Content Delivery

  4. Сreate as many distributions as you need and choose different files for each. You’ll need to click the Release button next to the necessary distribution every time you want to send new translations to the app. Over-the-Air Content Delivery

Note! Currently Custom Languages, Dialects, and Language Mapping are not supported for IOS integration.


Required for all features
your_distribution_hashUnique hash which you can get by going to Projects Settings > Content Delivery. To see the distribution hash, click three-dot button on the needed distribution, choose Edit and copy distribution hash
localizations Target languages of your Crowdin project (e.g. ‘fr’, ‘el’). Format: osx_locale
source_languageSource language of your Crowdin project (e.g. "en"). Format: osx_locale
Required for Real-Time Preview and Screenshots
Crowdin authorization credentials. Open the project and go to Project Settings > Content Delivery, choose the feature you need and click Get Credentials
your_organization_domainThis field is not used to the Crowdin project

File Export Patterns

You can set file export patterns and check existing ones using File Settings. The following placeholders are supported for IOS integration:

Name Description
%language% Language name (e.g. Ukrainian)
%locale% Locale (e.g. uk-UA)
%locale_with_underscore% Locale (e.g. uk_UA)
%osx_code% OS X locale identifier used to name ".lproj" directories
%osx_locale% OS X locale used to name translation resources (e.g. uk, zh-Hans, zh_HK)

Crowdin SDK Installation, Setup, and Advanced Features

For more details on how to set up Crowdin SDK for your application visit our GitHub repository.

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