# OB Calc (cloud) vs Simple Pregnancy Wheel

The clearest difference is review sentiment: Simple Pregnancy Wheel at 100% against OB Calc (cloud)'s 0%. Simple Pregnancy Wheel also leads on in-app purchases (none vs 2) and ratings volume (127 vs 5). OB Calc (cloud)'s advantage is rating (5.0 vs 4.7). On price, update cadence, 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. Simple Pregnancy Wheel asks for nothing beyond the download.

OB Calc (cloud) holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Simple Pregnancy Wheel has 127 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 0% of OB Calc (cloud)'s written reviews are positive against 100% of Simple Pregnancy Wheel's, so the app with the better star average is not the one people write more warmly about.

OB Calc (cloud) ships an update every 3 months, Simple Pregnancy Wheel every 6 months. Both last shipped on November 11, 2026.

## The numbers

| Metric | OB Calc (cloud) | Simple Pregnancy Wheel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** | [4.7 (127 ratings)](https://appshunter.io/ios/app/simple-pregnancy-wheel/id1568798323/reviews) |
| Number of ratings | 5 | **127** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 14 MB | 4 MB |
| Requires iOS | 18.0 | **12.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [David Patton](https://appshunter.io/developer/576122096) |

## 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 |


### Simple Pregnancy Wheel

[App page](https://appshunter.io/ios/app/simple-pregnancy-wheel/id1568798323)

Easily calculate gestational age and due dates based on your last menstrual period or due date. This app provides simple, straightforward tools for pregnancy tracking.

**Highlights:** Calculate gestational age, Determine due date, Track pregnancy dates, Simple interface

**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 Simple Pregnancy Wheel free?

Simple Pregnancy Wheel is free to download, with no in-app purchases.

### Which has better reviews, OB Calc (cloud) or Simple Pregnancy Wheel?

OB Calc (cloud) is rated higher. OB Calc (cloud) averages 5.0 out of 5 from 5 ratings, while Simple Pregnancy Wheel averages 4.7 from 127 ratings.

### Do OB Calc (cloud) or Simple Pregnancy Wheel have ads?

Neither OB Calc (cloud) nor Simple Pregnancy Wheel shows ads.

### Which is updated more often, OB Calc (cloud) or Simple Pregnancy Wheel?

OB Calc (cloud) ships an update every 3 months, and Simple Pregnancy Wheel every 6 months. Most recently, OB Calc (cloud) was updated on November 11, 2026 and Simple Pregnancy Wheel on November 11, 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.*