Rosetta Stone: Fluency Builder is a mobile language learning app developed by Rosetta Stone Ltd. It is available for iPhone users and is free to download. This app provides users with a convenient way to access their language learning experience anytime and anywhere.

With Rosetta Stone: Fluency Builder, users can seamlessly transition from their computer to their mobile device and continue their lessons without losing their progress. The app offers a tailored learning experience based on the user's level and goals, ensuring that each lesson is relevant and effective.

One of the standout features of this app is its focus on communication skills. Users can practice their reading and pronunciation and receive timely feedback to improve their language proficiency. The app also provides clear markers of progress, allowing users to track their advancement towards their learning goals.

It is important to note that this app is currently only available to corporate learners. Whether you're looking to enhance your language skills for work or personal growth, Rosetta Stone: Fluency Builder offers a comprehensive and convenient language learning solution.