Available for free on the Apple App Store.
To use without Wi-Fi or mobile data, follow these steps within the app: Google Translate - Apps on Google Play
You can download language packs (e.g., Spanish, French, Chinese) to translate text without an active internet connection.
Download directly from the Google Play Store. It is often pre-installed on many Android tablets and phones.
Copy text in any other app on your phone and tap the Google Translate icon to see the translation without switching apps. How to Download Languages for Offline Use
Near real-time bilingual voice translation for 70+ languages.