en عمومى General پژوهشي Research <strong>Background</strong>: Monitoring the adherence of pregnant women to taking iron supplements indicates controlling the appropriateness of taking a certain number of supplements. This increases the odds of effective iron absorption; a process that occurs by consuming at least 30 iron pills a month to prevent gestational anemia. This study aimed to determine the effects of monitoring pregnant women&rsquo;s compliance in taking up iron supplements through an Android application in Jambi City, Indonesia.&nbsp;<br> <strong>Methods</strong>: This was a quasi-experimental single group study with a pre-test-post-test design. The study subjects included a convenient sample of women in their third trimester referring to 3 maternity Hospitals in Jambi City, Indonesia, in 2020. Initial data were obtained through Hemoglobin (Hb) measurements before being given a monitoring application and subsequent Hb level checks after giving the application. The obtained data were analyzed by t-test and Mann-Whitney U test in SPSS 16. A significance level of 5% was considered.<br> <strong>Results</strong>: The results obtained in the initial examination indicated that the minimum Hb level was equal to 7.3 g/dL and the maximum level was measured as 11.2 g/dL. After the intervention, the Hb level increased to a minimum of 7.6 g/dL and a maximum of 12.2 g/dL. The Mann-Whitney U test data suggested a significant difference in the degree of compliance of pregnant women with iron supplementation (P=0.010).<br> <strong>Conclusion</strong>: Monitoring through the Android application increased pregnant women&rsquo;s compliance with taking iron supplements and presented a linear impact on increasing their Hb level. Hemoglobin, Third trimester, Pregnant women, Ferrous fumarate, Adherence 237 244 http://jccnc.iums.ac.ir/browse.php?a_code=A-10-380-1&slc_lang=en&sid=1 Enny Susilawati ennysusilawati.poltekkes@gmail.com 10031947532846007240 10031947532846007240 Yes Department of Midwifery, Health Polytechnic of Jambi, Indonesia. Yuli Suryanti nuraidah.poltekkes869@gmail.com 10031947532846007241 10031947532846007241 No Department of Midwifery, Health Polytechnic of Jambi, Indonesia. Lia Artika Sar liaartikasari57@gmail.com 10031947532846007242 10031947532846007242 No Department of Midwifery, Health Polytechnic of Jambi, Indonesia. Herinawati herinawati.poltekkes@gmail.com 10031947532846007243 10031947532846007243 No Department of Midwifery, Health Polytechnic of Jambi, Indonesia. Ika Murtiyarini ikamurtiyarini.poltekkes@gmail.com 10031947532846007244 10031947532846007244 No Department of Midwifery, Health Polytechnic of Jambi, Indonesia.