# Perinatal Calculators vs OB Calc (cloud)

The clearest difference is in-app purchases: Perinatal Calculators at none against OB Calc (cloud)'s 2. Perinatal Calculators also leads on update cadence (monthly vs every 3 months) and iOS requirement (15.6 vs 18.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. OB Calc (cloud) sells 2 in-app purchases, starting at $2.99 per month. Perinatal Calculators asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Perinatal Calculators against 5.0 for OB Calc (cloud). Both are backed by a comparable volume of ratings — 2 and 5 respectively.

Perinatal Calculators ships an update monthly, OB Calc (cloud) every 3 months. The most recent releases landed on September 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Perinatal Calculators | OB Calc (cloud) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/perinatal-calculators/id959395503/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 14 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [David Deschamps](https://appshunter.io/developer/959395502) | [Glen Botha](https://appshunter.io/developer/943181947) |

## What reviewers say

### 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


### OB Calc (cloud)

[App page](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465)

This medical app helps obstetricians efficiently calculate key patient test date windows. It offers multiple calculation methods and allows for saving patient data and generating PDF reports. A free trial is available, followed by a subscription for full access.

**Highlights:** LMP, EDC, Ultrasound, CRL, and IVF calculations, Customizable test date ranges, Cross-device data syncing, PDF report generation, Save individual patient data

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.99 | per month |
| Premium (Annual) | $29.99 | per year |


## Frequently asked questions

### Is Perinatal Calculators free?

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

### Is OB Calc (cloud) free?

OB Calc (cloud) is free to download, with in-app purchases available.

### Which has better reviews, Perinatal Calculators or OB Calc (cloud)?

Perinatal Calculators and OB Calc (cloud) are both rated 5.0 out of 5 on the App Store, from 2 and 5 ratings respectively.

### Do Perinatal Calculators or OB Calc (cloud) have ads?

Neither Perinatal Calculators nor OB Calc (cloud) shows ads.

### Which is updated more often, Perinatal Calculators or OB Calc (cloud)?

Perinatal Calculators ships an update monthly, and OB Calc (cloud) every 3 months. Most recently, Perinatal Calculators was updated on September 24, 2026 and OB Calc (cloud) on October 25, 2026.

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