S-Check App Trial: To determine the feasibility and efficacy of the S-Check App as a self-administered harm reduction and early intervention tool for those who use methamphetamine.

The S-Check App has been developed as a self-administered smartphone based harm reduction and early intervention application for those who use methamphetamine. The S-Check App will be provide the user with information to manage their methamphetamine use and support services available, should they need to seek help. One group will be randomize to have immediate access to the App for 28 days while the one group will be randomize to have delayed access to the App 28 days later. Both groups will be asked to complete a surveys at the start and 28 days to assess whether there has been any behavioral change in their methamphetamine use. Frequency and use of the features of the App will be at the discretion of the participant for the 28 days that they will have access to the App. The App has several sections, such as physical health, social health and psychological well being. The participant will be able to enter information into these sections and the App will be able to provide advice based on the associated risk of the information supplied. The App also has a diary section, where the participant can write and upload videos, audio and pictures to seek track of their progression. They will be awarded achievement badges upon completion of each section of the App. Internal metrics will capture which sections of the App are used, the frequency and the duration of App use. This information together with the surveys will assist the study team in determining the efficacy and feasibility of the App as a harm reduction and early intervention tool.