# Obstetrical Calculator vs Perinatal Calculators

The clearest difference is in-app purchases: Perinatal Calculators at none against Obstetrical Calculator's 4. Perinatal Calculators also leads on ads (none vs shown) and update cadence (monthly vs every 20 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Obstetrical Calculator sells 4 one-off in-app purchases. Perinatal Calculators asks for nothing beyond the download.

Obstetrical Calculator ships an update every 20 months, Perinatal Calculators monthly. The most recent releases landed on November 1, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Obstetrical Calculator | Perinatal Calculators |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/perinatal-calculators/id959395503/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 2 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Manuel Posadas](https://appshunter.io/developer/528175386) | [David Deschamps](https://appshunter.io/developer/959395502) |

## What reviewers say

### Obstetrical Calculator

[App page](https://appshunter.io/ios/app/obstetrical-calculator/id590285512)

This medical application provides essential calculations for obstetrics. It serves as a clinical support tool, but all results require confirmation by a healthcare professional. It is not a replacement for professional medical judgment.

**Highlights:** Obstetrical calculations, Clinical support tool, Requires professional confirmation, Supports iOS devices

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Give a little | $0.99 | one-time |
| Remove Advertisements | $0.99 | one-time |
| Give a lot | $4.99 | one-time |
| Make my day | $9.99 | one-time |


### Perinatal Calculators

[App page](https://appshunter.io/ios/app/perinatal-calculators/id959395503)

This app provides essential obstetrical and perinatal calculators for healthcare providers. It aids in patient counseling with tools for assessing risks like extreme prematurity and Down Syndrome, and managing conditions like gestational diabetes. All calculations are performed locally without an internet connection.

**Highlights:** Extreme prematurity calculator, VBAC success calculators, Down Syndrome risk assessment, Gestational diabetes insulin calculation, CCAMs CVR calculator, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Obstetrical Calculator free?

Obstetrical Calculator is free to download, with in-app purchases available.

### Is Perinatal Calculators free?

Perinatal Calculators is free to download, with no in-app purchases.

### Do Obstetrical Calculator or Perinatal Calculators have ads?

Obstetrical Calculator shows ads; Perinatal Calculators does not.

### Which is updated more often, Obstetrical Calculator or Perinatal Calculators?

Obstetrical Calculator ships an update every 20 months, and Perinatal Calculators monthly. Most recently, Obstetrical Calculator was updated on November 1, 2026 and Perinatal Calculators on September 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*