In this condition, participants will attend a 1-hour virtual ACT psychoeducational workshop where they will learn about ACT, practice the dropping anchor exercise (with a guided image sequence), and learn how to use the ACTaide mobile app, which they will be asked to use to practice the dropping anchor exercise daily for two weeks. The main feature of the ACTaide app is the annotated image sequence to guide users through the steps of the exercise. The app also features customizable reminders notifications. Participants will receive three reminders per day encouraging them to practice the exercise.

In this condition, participants will attend a 1-hour virtual ACT psychoeducational workshop where they will learn about ACT, practice the dropping anchor exercise (without a guided image sequence), and learn how to use the reminders-only mobile app, which they will be asked to use to practice the dropping anchor exercise daily for two weeks. This app will not include the annotated image sequence from ACTaide and instead will only include customizable reminders notifications. Participants will receive three reminders per day encouraging them to practice the exercise.

The 1-hour ACT psychoeducational workshop will introduce participants to Acceptance and Commitment Therapy and include guided practice of the mindfulness exercise that they will be asked to practice for two weeks.

the frequency and duration of home practice of a mindfulness exercise measured via the mobile app

an adapted version of the mHealth App Usability Questionnaire (MAUQ; Zhou et al., 2019) will be used to measure the acceptability of the app.

retention rates will be measured at the post-intervention and 2-week follow-up time points

The 21-item Depression, Anxiety, and Stress Scale (DASS-21; Lovibond & Lovibond, 1995) will be included. It is the proposed primary outcome of future efficacy trials. The DASS-21 is a self-report measure that assesses individuals' symptoms of depression, anxiety, and stress in the past week. Participants are asked to indicate the extent to which each statement applied to them over the past week from 0 (did not apply to me at all) to 3 (applied to me very much or most of the time). Sample items include: "I found it hard to wind down" and "I felt down-hearted and blue." Scores for each subscale will be computed by taking the sum of all items from each respective subscale and multiplying by two. To assess the efficacy potential of the intervention, we calculate the proportion of participants in each condition that reported clinically meaningful reductions in psychological distress at the post-intervention and follow-up time points.