100 Days of Right Believing is an iPhone devotional app developed by Hachette Book Group Inc. This app aims to help users develop highly effective habits for right believing and break free from bondages to live a life of victory. The app offers a devotion search feature, customized daily push notifications, and the ability to combine favorite passages with images into beautiful shareable 'Quotos'.

Each daily experience in this app includes a scripture to meditate on, a key truth about right believing, an uplifting and powerful thought for the day, a place to journal thoughts and reflections, and a simple but powerful prayer to help express your heart to your heavenly father. The app is authored by Joseph Prince, a leading voice in proclaiming the gospel of grace around the world through his teaching resources and television ministry.

The app is an excellent resource for anyone looking to develop a daily devotional habit and improve their relationship with God. The app is available for free on the App Store and is compatible with iPhone, iPad, and iPod touch.