Development and Accessibility of the INCE App to Assess the Gut–Brain Axis in Individuals with and Without Autism

In recent years, there has been increasing interest in the study of the gut–brain axis. Furthermore, there appears to be a relationship between abdominal pain, selective eating patterns, emotional instability, and intestinal disorders in Autism Spectrum Disorder (ASD). This work describes the development and accessibility evaluation of the INCE mobile app. This mobile app allows users to obtain levels of gut–brain interaction severity using two scientifically proven scales: The Gastrointestinal Symptom Severity Scale (GSSS) and the Pain and Sensitivity Reactivity Scale (PSRS). The validity of both instruments was established in previous studies in neurotypical and autistic populations. Statistically significant improvements were found following post-design changes in the use and accessibility of the INCE app (.NET Maui 9 Software) reported by professionals (p = 0.013), families (p = 0.011), and adolescents (p = 0.004). INCE represents an important contribution to evidence-based applications and clearly translates into society.