The Aura App will typically use less than 50MB of space on your iPhone or Android device. During the initial analyzing process, the Aura App may temporarily use up to 1GB of your free disk space. This may be temporarily reflected in the app storage settings, but it's really just the size of your photo library as Aura is sorting your photos. After your library is analyzed, your storage settings will update to reflect the actual size of the Aura App. The app will never use the the last 100MB of free space on your device.