Objectives The aim of this study was to elucidate the effect of application-based antenatal education based on social cognitive theory (SCT) on Health Promoting Lifestyle Profile II (HPLP II) scores, compliance with iron tablet consumption, and readiness for childbirth and complications among pregnant women in Denpasar, Bali, Indonesia. Methods: This randomized controlled trial included 71 pregnant women in the treatment group and 74 pregnant women in the control group. The treatment group application-based antenatal education based on SCT, while the control group attended a conventional pregnancy class. Iron tablet consumption was verified by counting the remaining iron tablets. Information on participants’ lifestyles was collected using the HPLP II questionnaire with the help of an assistant. The collected data were statistically analyzed using IBM SPSS ver. 24.0. Results: The antenatal education intervention effectively increased the HPLP II score by 0.32 points (2.62±0.331 before the intervention and 2.94±0.273 after). Meanwhile, the control group had a 0.13-point increase (p=0.001), from 2.67±0.336 to 2.80±0.275. There was no significant difference in iron tablet consumption (p=0.333) or readiness for delivery and complications (p=0.557) between the treatment and control groups. Conclusion: Application-based antenatal education with SCT effectively increased the HPLP II scores of pregnant women in Denpasar, Bali. Although there was no significant difference in iron tablet consumption or readiness for delivery and complications, the values increased to a greater extent in the treatment group than in the control group. This education model is more suited to urban pregnant women who employed and have good internet access.
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