Participants in this condition were delivered 8 weeks of online intervention modules and then were invited to complete a posttest survey.

Participants in this condition received no intervention content nor communications for 8 weeks and then were invited to complete a posttest survey.

The intervention (app.striveweekly.com) delivered eight modules: introduction module, six skills modules, and wrap-up module. The two program "brand name" versions had identical content, but different aesthetic schemes. Modules were released week-by-week, and participants self-guided through content. To facilitate skills practice, every module was accompanied by: a weekly intro email and reminder emails; an "extras" section for tips/suggestions; and a weekly prize drawing. The "Dashboard" section of the intervention displayed user progress. The "Campus" section of this dashboard provided: campus-specific announcements; referrals to relevant campus wellness resources; and an anonymous livestream of all campus users' activity.

Strategies/skills included: Psychoeducation; Self-monitoring; Behavioral activation; Cognitive restructuring; Sleep hygiene; Time management; Interpersonal avoidance exposures; Physical exercise; Mindfulness; Maintenance planning.

This 21-item self-report measure assesses symptoms of depression, anxiety, and stress. Individual items are rated 0 (Did not apply to me at all) to 3 (Applied to me very much or most of the time), with total scores ranging 0 - 63. Lower scores at posttest relative to baseline indicate improvement.

This outcome was assessed based on number of modules with 1+ skills practice log. Skills practice logs were recorded as behavioral data, stored within the online platform's database of user account activity.

This 4-item self-report measure assesses subjective happiness. Individual items are rated 1 to 7, with total scores ranging 4 - 28. Higher scores at posttest relative to baseline indicate improvement.