# OB Calc (cloud) vs Obstetric Calculator Plus

The clearest difference is in-app purchases: Obstetric Calculator Plus at none against OB Calc (cloud)'s 2. Obstetric Calculator Plus also leads on iOS requirement (11.0 vs 18.0). OB Calc (cloud)'s advantage is update cadence (every 3 months vs every 19 months) and rating (5.0 vs 4.7). On price, ratings volume, ads 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. Obstetric Calculator Plus asks for nothing beyond the download.

OB Calc (cloud) holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 5 and 7 respectively.

OB Calc (cloud) ships an update every 3 months, Obstetric Calculator Plus every 19 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OB Calc (cloud) | Obstetric Calculator Plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** | [4.7 (7 ratings)](https://appshunter.io/ios/app/obstetric-calculator-plus/id1606532563/reviews) |
| Number of ratings | 5 | **7** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 19 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 14 MB | 34 MB |
| Requires iOS | 18.0 | **11.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [Mehdi Taghavi](https://appshunter.io/developer/1606532565) |

## 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 |


### Obstetric Calculator Plus

[App page](https://appshunter.io/ios/app/obstetric-calculator-plus/id1606532563)

This medical app assists healthcare professionals in calculating gestational age, fetal age, and estimated due dates for pregnant patients. It also includes BMI calculation to support patient care.

**Highlights:** Gestational age calculation, Fetal age calculation, Estimated date of delivery, BMI calculation, Supports LMP and ultrasound dates

**Features:** macOS Compatibility

**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 Obstetric Calculator Plus free?

Obstetric Calculator Plus is free to download, with no in-app purchases.

### Which has better reviews, OB Calc (cloud) or Obstetric Calculator Plus?

OB Calc (cloud) is rated higher. OB Calc (cloud) averages 5.0 out of 5 from 5 ratings, while Obstetric Calculator Plus averages 4.7 from 7 ratings.

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

Neither OB Calc (cloud) nor Obstetric Calculator Plus shows ads.

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

OB Calc (cloud) ships an update every 3 months, and Obstetric Calculator Plus every 19 months. Most recently, OB Calc (cloud) was updated on October 29, 2026 and Obstetric Calculator Plus 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.*