LANG is a free language learning app available for iPhone users. It is an engaging and interactive platform designed to help users learn Spanish or English. The app offers fast and playful lessons with fun characters to help users practice speaking, reading, listening, and writing, which helps build their vocabulary and grammar skills.

The app is developed by experts in the field of foreign languages who have used a scientifically proven methodology to promote long-term language memorization. The lessons are designed to help users with real-life communication, whether it's for travel, school, career, family and friends, or for brain health. Overall, LANG is an excellent app for those looking to learn a new language in an entertaining and interactive way.

It is important to note that LANG is a free app and is available on iPhone. The terms of service are available on Apple's website.