Autism Spectrum Disorder (ASD) refers to a neurodevelopmental disorder which is characterized by repetitive patterns, and difficulties with social interaction and communication. People with ASD have, an affinity with technology; many studies designed and/or developed specific systems for this kind of users. Some studies have evaluated the usability and UX of such systems through general evaluation methods. It is important to consider adaptations to the UX evaluation methods when evaluating systems designed for people with ASD, because these users have a diversity of characteristics, affinities and needs that traditional methods do not consider. Given the need for specific evaluation methods, in this paper we propose a property checklist for interactive systems designed for people with ASD, based on our previous proposal of 9 UX factors. Two versions of the property checklist are proposed, a full version and a compact version, which include 9 categories (directly related to the 9 UX factors), and 50 and 24 items, respectively. These property checklists are intended to assess compliance with specific recommendations and may help evaluating UX in systems designed for people with ASD.