Weight management during pregnancy is critical to health of both mothers and infants. Online weight management interventions have advantages of convenience, accessibility, and flexibility. Objective: This paper examines the satisfaction of pregnant women with the weight management online intervention in the e-Moms of Rochester project and evaluates the satisfaction level by study arm and by demographic characteristic. Methods: e-Moms of Rochester is a randomized controlled trial designed to help pregnant women achieve a recommended weight gain during pregnancy via an online intervention. The satisfaction survey was available online to the participants after their delivery. 942 out of 1512 pregnant women completed the satisfaction survey. Among the 942 participants, 621 women were in the intervention arm while the other 321 were in the control arm. The satisfaction level was measured on a 10-point Likert-scale from “0-strongly disagree” to “10-strongly agree”. A score of 0-4 was counted as low satisfaction, 5-7 as medium satisfaction and 8-10 as high satisfaction. Chi-square test and Mann-Whitney U test were used for evaluating representativeness, satisfaction level across website features, and comparison of satisfaction by study arm and by demographic characteristic. Results: 70%-91.2% participants had a moderate to high satisfaction with different website features. However, 59.3% participants rated social support negatively. The Resources (mean=7.29) and Articles & FAQ (mean=7.28) had the highest satisfaction levels on helpfulness. The weight gain tracker was rated highest in terms of ease of use (mean= 8.35). The satisfaction levels of helpfulness of Resources and Reminder were significantly different by arm (p= 0.035; p= 0.002). Satisfaction levels for some website features were significantly different as well by demographic characteristic. Conclusion: Overall, participants felt satisfied with the project website except for the aspect of social support. The sections of Articles & FAQ and Resources were the most helpful. Weight gain tracker was the easiest to use in the intervention group. The intervention group had higher satisfaction level with Resources and Reminder. Pregnant women, who were low-income, young, Hispanic, African American or had a lower education level, were more satisfied with the website features. And these women who were African American, young, with lower education, or with lower income, had significantly higher ratings of social support in this e-Moms Roc project.