# Preg Wheel vs OB Calc (cloud)

The clearest difference is review sentiment: Preg Wheel at 59% against OB Calc (cloud)'s 0%. Preg Wheel also leads on in-app purchases (none vs 2) and ratings volume (62 vs 5). OB Calc (cloud)'s advantage is rating (5.0 vs 4.0) and update cadence (every 3 months vs every 9 months). On price, 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. Preg Wheel asks for nothing beyond the download.

OB Calc (cloud) holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Preg Wheel has 62 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 59% of Preg Wheel's written reviews are positive against 0% of OB Calc (cloud)'s, so the app with the better star average is not the one people write more warmly about.

Preg Wheel ships an update every 9 months, OB Calc (cloud) every 3 months. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Preg Wheel | OB Calc (cloud) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (62 ratings)](https://appshunter.io/ios/app/preg-wheel/id445303968/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** |
| Number of ratings | **62** | 5 |
| Positive reviews | **58.6% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 24 MB | 14 MB |
| Requires iOS | **10.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 17+ | 4+ |
| Developer | [Andrew Yu](https://appshunter.io/developer/328693314) | [Glen Botha](https://appshunter.io/developer/943181947) |

## What reviewers say

### Preg Wheel

[App page](https://appshunter.io/ios/app/preg-wheel/id445303968)

This app provides a digital pregnancy wheel for iPhone users, eliminating the need for a physical one. It allows for quick input of key dates and offers accurate results, accounting for calendar variations. The app also saves your information for future use and includes important dates for screenings throughout the pregnancy.

**Highlights:** Input LMP, EDD, EGA, and IVF dates, Accurate date calculations with leap year support, Save and restore input dates, Track important screening test dates, View dates for 1st Trimester US, CVS, Quad Screen, and more

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Fast calculations
- ✅ Accurate results
- 👍 Great for medical professionals
- 👍 Efficient paper wheel alternative

**What reviewers complain about**

- 🐛 Not updated for latest iOS
- 🐛 Functionality issues after updates
- 🐛 IVF dating function not working
- 🐛 Inconsistent calculations
- 🐛 App crashes/shuts down

**Reported bugs**

- IVF dating function does not work
- Cannot calculate due date based on weeks and ultrasound date
- LMP does not change when due date is entered, and vice versa
- App not compatible with iOS 14
- App not compatible with iOS 11

**Requested features**

- Update for latest iOS
- Update IVF dating function
- Add FTS window
- Ensure compatibility with newer devices/OS
- Local time zone support


### 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 Preg Wheel free?

Preg Wheel 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, Preg Wheel or OB Calc (cloud)?

OB Calc (cloud) is rated higher. Preg Wheel averages 4.0 out of 5 from 62 ratings, while OB Calc (cloud) averages 5.0 from 5 ratings.

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

Neither Preg Wheel nor OB Calc (cloud) shows ads.

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

Preg Wheel ships an update every 9 months, and OB Calc (cloud) every 3 months. Most recently, Preg Wheel was updated on October 15, 2026 and OB Calc (cloud) on October 8, 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.*