Which of the following is NOT part of the UXDI Native App Checklist?

The correct answer is that download speed is not part of the UXDI Native App Checklist. This checklist typically focuses on user engagement and the app's functionality rather than technical performance metrics like download speed.

The volume of users, unique features, and frequency of use are more relevant as they pertain to the overall user experience and how effectively an app meets the needs of its audience. Volume of users indicates popularity, unique features help differentiate the app and enhance user experience, and frequency of use reflects user engagement and satisfaction. Download speed, while important for overall performance, does not directly relate to user experience assessments as characterized by the UXDI Native App Checklist.