Treating and preventing postpartum depression is related to a number of attitudinal and practical barriers. Addressing these barriers are web-interventions using persuasive technology, aiming to identify women at risk, prevent development of depressive symptoms, and increase subjective well-being. The purpose of this study was to investigate persuasive features and acceptability among users of Mamma Mia ; a web-intervention for perinatal depression. Based on mixed-model design, semi-structured interviews were conducted on ten perinatal well-educated, employed women with partners (age 28-41). The statements derived from the interviews were unitized and coded into two theoretical and methodological frameworks; SWOT and Persuasive Systems Design (PSD) Model. Results from content and thematic analyses show that the PSD-model and SWOT framework capture significant aspects and qualities of persuasive features in explaining information systems interaction with its users. Thematic analysis indicates that the Mamma Mia intervention is perceived as acceptable, and professional, which are qualities predicting adherence. The study contributes support for assessing persuasive features to develop successful persuasive systems, utilizing specific persuasive features that predict adherence, and qualities of features to enhance user satisfaction, and effectiveness of mental health interventions.