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.

INTERVENTION: 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. CONDITION: Mental Health ‐ Addiction Methamphetamine Use Disorder; ; Methamphetamine Use Disorder PRIMARY OUTCOME: To see whether the S‐Check App can motivate behavioural change amongst people who use methamphetamine. Participants in both arms will be asked to complete the Readiness to Change, General Help‐Seeking and Actual Help Seeking Surveys. Those who have immediate access to the App will complete the surveys at the start of the trial and 28 days following usage of the App. Those who have been randomised to having delayed access will complete the survey at the start of the trial and then again at 28 days before having access. The data from both groups will be reviewed to assess whether the App motivated change in behaviour. [28 days] INCLUSION CRITERIA: • Be aged over 18 years old • Currently residing in Australia • Report use of methamphetamine at least once within the previous month • Have access to an individualised smartphone for the duration of the study (56 days) • Be willing and able to provide informed consent (via the S‐Check App) SECONDARY OUTCOME: To assess App engagement by treatment naive people. Internal App metrics will also be collected to determine the frequency and use of the features of the App, [Days 28 and 56.] To assess App usability. Participants will be invited to participate in a telephone interview to provide feedback on the use of the App. Internal App metrics will also be collected to determine the frequency and use of the features of the App, [Days 28 and 56.] To assess App usage. Internal App metrics will also be collected to determine the frequency and use of the features of the App, [Days 28 and 56.] To assess predictors of engagement (by age, gender, sexual orientation, duration and frequency of methamphetamine use, previous or current treatment participation). Questions regarding age, gender, sexual orientation, duration and frequency of methamphetamine use, previous or current treatment participation and frequency of methamphetamine use have been included as part of the trial. The information obtained will assess predictors of engagement. [Days 28 and 56.] To understand participant experiences in using the App and factors affecting engagement and impact. Participants will be invited to participate in a telephone interview to provide feedback on the use of the App. Internal App metrics will also be collected to determine the factors affecting engagement and impact of the App, [Days 28 and 56.]