The 500 Life-studies (500LS) app, developed by LivingStream, is an educational and reference program available on the iPhone platform. It aims to assist and inspire believers in deepening their understanding of the Bible through the regular and habitual use of the Life-study of the Bible. This monumental work by Witness Lee provides a book-by-book exposition of the entire Bible, focusing on the believers' enjoyment of Christ as life for the building up of the church as the Body of Christ.

With the goal of reading at least 500 Life-study messages, the app offers customizable reading schedules that can be tailored to your reading capacity and time. It encourages users to start small to achieve better consistency in their study habits.

The app provides easy access to the Life-study messages, allowing users to read them directly within the app without the need for an internet connection. Alternatively, integration with ministrybooks.org is available, either for free or through a paid subscription. This offers users flexibility in accessing the materials according to their preference.

To help users track their progress, the app provides a visualization of both overall and recent progress. Users can work towards their goals and earn milestone badges along the way, providing a sense of accomplishment and motivation.