OB Datum: Pregnancy Dating
Transparent EDD, IVF, and gestational-age calculations
iPhone · iPadAvailable now$1.99 US · All features included
About the product
Calculate pregnancy dates from LMP, conception or ovulation, an established EDD, known gestational age, or IVF embryo transfer. Review the source, formula, equivalent dates, and calculation-engine version behind each result. Compare dating evidence while keeping an established EDD locked; the app never changes, averages, or recommends changing it.
Version 1.1 includes every feature in the paid download: all dating methods, read-only Health import, reconciliation, unlimited anonymous cases, sharing, Calendar export, and custom timeline milestones. No subscription, advertising, or separate feature purchase.
Explore the interactive pregnancy wheel and timeline. Anonymous calculations stay on your device. Independently verify inputs, results, and sources before clinical use.
In the hand
What's new
Version 1.1 — Every feature is included in the downloaded app, with no separate in-app purchase. Clinical sources appear as a non-interactive bibliography. Calculations remain private, offline, and reviewable.
Released 2026-09-15.
Key features
- 01LMP, conception, known EDD, gestational age, and IVF dating
- 02Transparent formulas and locked-EDD comparison
- 03Interactive pregnancy wheel and timeline
- 04Unlimited anonymous cases stored on device
- 05Read-only Health import, sharing, and Calendar export
- 06Every feature included in the paid download; no subscription
Product documentation
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