Cost: $24.99
Immigration Law text
Cross references the INA with the CFR

Cost: Free
News app includes immigration news sources as a legal topic. Don't really need an app, works on a browser

Cost: Free
Word Lens is no more, try Google Translate instead. Summary of features include:

• Converse naturally and let Google translate
• Translate with your voice, camera, keyboard or handwriting
• Star your favorite translations for quick access even when you’re offline
• View dictionary results for single words or phrases