Crowdin SDK allows delivering new translations from the Crowdin Enterprise project to your application immediately. Using the integration with Crowdin SDK, you won’t need to update the application in the App Store every time there is a new localization version.

The SDK provides the following features:

  • Over-The-Air Content Delivery – Send the localized files from the Crowdin Enterprise project to your application whenever needed.
  • Real-Time Preview – Preview all the translations done in the Editor in your version of the application in real-time. You can preview already completed translations and the ones you’re currently typing in.
  • Screenshots – Automatically send all the screenshots with tagged source strings made in your application to the Crowdin Enterprise project.


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

Development Tool

  • Xcode version 10.2+

App Programming Language

  • Swift version 4.2+

Operating System

  • iOS version 9.0+

Distributions and Releases

Configure the distribution to mirror the translated content of your project and integrate with the iOS app. Read more about Distributions.

Crowdin SDK Installation and Setup

For more details on setting up Crowdin iOS SDK for your application, visit our GitHub repository.

Advanced Features

Real-time Preview

This feature allows translators to see translations in the application in real-time. Managers and the QA team can also use it to preview translations before release.

Read more about Real-time Preview.


Enable this feature if you want all the screenshots made in the application to be automatically sent to your Crowdin Enterprise project with tagged strings. This way, translators will have an additional context for the source strings.

Read more about Screenshots.

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)
%two_letters_code% Language code ISO 639-1 (e.g., uk)
%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 iOS SDK CDN feature is built with security in mind, which means minimal access possible from the end-user is required. When you decide to use Crowdin iOS SDK, please make sure you’ve made the following information accessible to your end-users.

  • We use the advantages of Amazon Web Services (AWS) for our computing infrastructure. AWS has ISO 27001 certification and has completed multiple SSAE 16 audits. All the translations are stored at AWS servers.
  • When you use Crowdin iOS SDK CDN – translations are uploaded to Amazon CloudFront to be delivered to the app and speed up the download. Keep in mind that your users download translations without any additional authentication.
  • We use encryption to keep your data private while in transit.
  • We do not store any Personally Identifiable Information (PII) about the end-user, but you can decide to develop the opt-out option inside your application to make sure your users have full control.
  • The Automatic Screenshots and Real-Time Preview features are supposed to be used by the development team and translators team. Those features should not be compiled into the production version of your app. Therefore, they should not affect end-users privacy in any way.


Q: What might cause the occasional delay in getting the latest translations in the app?
A: CDN caches all the translations in release for up to 1 hour. When new translations are released in Crowdin Enterprise, CDN may still return them with a delay.

See Also

Was this article helpful?