# Obstetrical Calculator vs OB Calc (cloud)

The clearest difference is ads: OB Calc (cloud) at none against Obstetrical Calculator's shown. OB Calc (cloud) also leads on update cadence (every 3 months vs every 20 months). Obstetrical Calculator's advantage is iOS requirement (16.0 vs 18.0). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Obstetrical Calculator sells 4 one-off in-app purchases and OB Calc (cloud) sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Obstetrical Calculator ships an update every 20 months, OB Calc (cloud) every 3 months. The most recent releases landed on September 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Obstetrical Calculator | OB Calc (cloud) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 3 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 4 MB | 14 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Manuel Posadas](https://appshunter.io/developer/528175386) | [Glen Botha](https://appshunter.io/developer/943181947) |

## 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 |


### 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 Obstetrical Calculator free?

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

### Is OB Calc (cloud) free?

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

### Do Obstetrical Calculator or OB Calc (cloud) have ads?

Obstetrical Calculator shows ads; OB Calc (cloud) does not.

### Which is updated more often, Obstetrical Calculator or OB Calc (cloud)?

Obstetrical Calculator ships an update every 20 months, and OB Calc (cloud) every 3 months. Most recently, Obstetrical Calculator was updated on September 29, 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.*