I was so enthused by the knowledge of such an app, but I am highly disappointed in the lack of essential questions in determining an appropriate mask. For example, I am a side sleeper, and due to significant back injuries, there is no alternative for me. Nor is side sleeping even an option in MaskFit AR‘s questionnaire. I also sleep with my mouth open, and that, too, is not possible to modify. These two issues are significantly important in choosing an appropriate mask, and I am stunned that they are not even listed as possibilities to select. One question asks a patient’s preferred sleep position, and the only three choices are a) restless (!!!), b) prone, c) back. Side sleeping is not even listed as a possibility, but should always be considered in determining an appropriate mask. I am certain that no one would choose restless as a sleeping position, and prone is questionable/non-descriptive as an option as well. Alas, i gleaned absolutely no help whatsoever from MaskFitAR. What a brilliant idea, but definitely needs to be better developed, as the potential with the artificial intelligence seems quite significant. Thank you.