# OB Calc (cloud) vs OB Wheel

The clearest difference is rating: OB Calc (cloud) at 5.0 against OB Wheel's 4.3. OB Wheel's advantage is update cadence (every 4 days vs every 3 months) and monetization model (free vs free with in-app purchases). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

OB Calc (cloud) holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 5 and 10 respectively.

OB Calc (cloud) ships an update every 3 months, OB Wheel every 4 days. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | OB Calc (cloud) | OB Wheel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** | [4.3 (10 ratings)](https://appshunter.io/ios/app/ob-wheel/id6473123188/reviews) |
| Number of ratings | 5 | **10** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 14 MB | 28 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [Berkay Gurcesme](https://appshunter.io/developer/1618081315) |

## 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 |


### OB Wheel

[App page](https://appshunter.io/ios/app/ob-wheel/id6473123188)

This app assists expectant mothers and healthcare professionals in tracking pregnancy with accurate due date calculations and weekly fetal development updates. It offers customizable features, health tips, and tools for clinicians to support patient care throughout the journey to delivery.

**Highlights:** Accurate due date calculation, Weekly fetal development tracker, Customizable reminders and tracking, Health tips and resources, Tools for healthcare professionals, Symptom and feeling logging

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ob Wheel lifetime ad-free | $3.99 | one-time |
| Unlimited Ad-free Ob wheel | $9.99 | one-time |


## Frequently asked questions

### Is OB Calc (cloud) free?

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

### Is OB Wheel free?

OB Wheel is free to download, with in-app purchases available.

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

OB Calc (cloud) is rated higher. OB Calc (cloud) averages 5.0 out of 5 from 5 ratings, while OB Wheel averages 4.3 from 10 ratings.

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

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

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

OB Calc (cloud) ships an update every 3 months, and OB Wheel every 4 days. Most recently, OB Calc (cloud) was updated on October 24, 2026 and OB Wheel on October 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*