A randomized controlled trial into the effectiveness of a mobile health application (SAM) to reduce stress and improve well-being in autistic adults.

Autistic adults experience more daily stress compared to non-autistic adults. However, stress recognition is often delayed, potentially leading to chronic stress and significant (mental) health risks. We evaluated the effectiveness of Stress Autism Mate (SAM), a stress-monitoring mobile health application co-created with autistic individuals. We ran a two-arm, parallel, superiority randomized controlled trial. Autistic adults ( = 214) (mean age: 50.5 years; 66.4% female) were randomized to 1-month SAM usage or waitlist control. Participants self-reported on primary (Perceived Stress Scale; Warwick-Edinburgh Mental Wellbeing Scale), and secondary outcomes (Coping Self-Efficacy Scale) at baseline and 4 weeks later, after which the control group could start using the app. Hierarchical multiple regression analyses revealed that the intervention group had significantly lower perceived stress ( = 0.27), greater mental well-being ( = 0.35), and improved coping self-efficacy ( = 0.16) compared to the control group after 1 month. No intervention effect moderators could be identified. More frequent app usage was significantly associated with a stronger decrease in perceived stress ( = -0.293). However, 42.9% of app users indicated increased stress from app use, warranting further investigation. Our results suggest that SAM may be effective in reducing perceived stress and improving mental well-being for some autistic individuals. Further refinement and investigation are recommended.Lay abstractAutistic adults often experience more daily stress than non-autistic individuals, but they may not always recognize this stress timely, which can lead to long-term health problems. To help address this, we tested an app called Stress Autism Mate (SAM), which was designed together with autistic individuals to help autistic adults monitor and manage their stress. In our study, 214 autistic adults (average age: 50.5 years; 66.4% female) were randomly assigned to either use the app for 1 month or wait before using it. We asked participants to complete surveys before and after the 1-month period to measure changes in their stress levels, mental well-being, and confidence in coping. Results showed that participants who used the app reported lower stress, improved mental well-being, and better coping skills compared to those who did not use the app. We also found that the more often someone used the app, the more their stress levels decreased. However, 42.9% of users felt more stressed using the app, which needs further study. Overall, our findings suggest that SAM can help reduce stress and improve well-being for some autistic adults, but more work is needed to improve the app and better understand its effects. ISRCTN Registry: ISRCTN17394910.