OB ToolBox vs Obstetrum

OB ToolBox provides a useful and quick reference values for fetal growth, estimated fetal weight, amniotic fluid and doppler indices, Bishop scores, preterm birth predictor, cesarean risk calculator, stillbirth calculator, miscarriage risk calculator, and more.

Clinical obstetric calculators for healthcare professionals — updated 2026. Gestational dating (ACOG CO 700), estimated fetal weight, fundal height, gestational weight gain, fetal Doppler, Bishop score and VBAC prediction. 100% local data. Most obstetric calculator apps on the market stopped being updated between 2014 and 2021. Obstetrum keeps its tools aligned with current international guidelines (ACOG, WHO, FIGO, NICE, INTERGROWTH-21st). PRENATAL CARE • Gestational age — ACOG CO 700 dating hierarchy (IVF > 1st trim CRL USG > LMP > 2nd/3rd trim USG) • Estimated fetal weight — Hadlock 1991, INTERGROWTH-21st percentiles (p3–p97) • Fundal height — INTERGROWTH-21st, weeks 13–40, serial trend curve • Gestational weight gain — IOM guidelines by pre-pregnancy BMI • Fetal Doppler — Umbilical fluxometry, resistance indices, FGR staging LABOR AND DELIVERY • Bishop score — Score 0–13 and cervical favorability • Labor progress — Stage diagnosis and management support • VBAC predictor — Grobman 2007, updated Grobman 2021, and Flamm-Geiger CLINICAL RECORDS & PDF Patient calculation history, professional PDF reports with plotted percentiles, record comparison, physician signature. PRIVACY Local SQLite database. No remote servers. No cloud sync. No mandatory accounts. PREMIUM • Unlimited records, PDF reports, record comparison, ad-free Not a regulated medical device. Clinical decision support tool for healthcare professionals. Always verify results against your institutional protocols and clinical judgment. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/