Participants receive access to the smartphone application, a 6-week mindfulness-based behavioral intervention adapted from the FOCUS program. Caregivers begin using the app the week prior to the patient's hematopoietic stem cell transplant and continue through six weeks of daily modules that include audio meditations, videos, text-based content, and reflection exercises.

A smartphone-delivered mindfulness program providing daily modules, guided meditations, brief strategies, and reflection prompts designed to reduce caregiver burden and distress.

Recruitment will be assessed by the ability to recruit approximately 4 caregivers per month until the target sample of 30 is reached.

Percentage of enrolled participants who complete the study through the end-of-treatment.

Percentage of participants who complete the baseline REDCap survey and the end-of-treatment survey.

Usability of the app measured using the System Usability Scale.

Number of modules completed per week.