# OB Calc (cloud) vs Gestational Age Calculator App

The clearest difference is in-app purchases: Gestational Age Calculator App at none against OB Calc (cloud)'s 2. Gestational Age Calculator App also leads on iOS requirement (14.0 vs 18.0). OB Calc (cloud)'s advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

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

OB Calc (cloud) ships an update every 3 months, Gestational Age Calculator App every 2 months. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OB Calc (cloud) | Gestational Age Calculator App |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 5 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [Ahmad Al Hariri](https://appshunter.io/developer/1648019898) |

## What reviewers say

### 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 |


### Gestational Age Calculator App

[App page](https://appshunter.io/ios/app/gestational-age-calculator-app/id6743996180)

**In-app purchases:** none


## Frequently asked questions

### Is OB Calc (cloud) free?

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

### Is Gestational Age Calculator App free?

Gestational Age Calculator App is free to download, with no in-app purchases.

### Do OB Calc (cloud) or Gestational Age Calculator App have ads?

Gestational Age Calculator App shows ads; OB Calc (cloud) does not.

### Which is updated more often, OB Calc (cloud) or Gestational Age Calculator App?

OB Calc (cloud) ships an update every 3 months, and Gestational Age Calculator App every 2 months. Most recently, OB Calc (cloud) was updated on November 7, 2026 and Gestational Age Calculator App on October 30, 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.*