  Augmented Reality (AR) based on Head-Mounted Displays (HMDs) has gained
significant traction over the recent years. Nevertheless, it remains unclear
what AR HMD-based applications have been developed over the years and what
their system performance is when they are run on HMDs. In this paper, we aim to
shed light into this direction. Our study focuses on the applications available
on the Microsoft Hololens application store given the wide use of the Hololens
headset. Our study has two major parts: (i) we collect metadata about the
applications available on the Microsoft Hololens application store to
understand their characteristics (e.g., categories, pricing, permissions
requested, hardware and software compatibility); and (ii) we interact with
these applications while running on a Hololens 2 headset and collect data about
systems-related metrics (e.g., memory and storage usage, time spent on CPU and
GPU related operations) to investigate the systems performance of applications.
Our study has resulted in several interesting findings, which we share with the
research community.
