# Obstetric Calculator Plus vs OB Wheel

The clearest difference is in-app purchases: Obstetric Calculator Plus at none against OB Wheel's 2. Obstetric Calculator Plus also leads on rating (4.7 vs 4.3) and iOS requirement (11.0 vs 14.0). OB Wheel's advantage is update cadence (every 4 days vs every 19 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. OB Wheel sells 2 one-off in-app purchases. Obstetric Calculator Plus asks for nothing beyond the download.

Obstetric Calculator Plus holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 7 and 10 respectively.

Obstetric Calculator Plus ships an update every 19 months, OB Wheel every 4 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Obstetric Calculator Plus | OB Wheel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (7 ratings)](https://appshunter.io/ios/app/obstetric-calculator-plus/id1606532563/reviews)** | [4.3 (10 ratings)](https://appshunter.io/ios/app/ob-wheel/id6473123188/reviews) |
| Number of ratings | 7 | **10** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 34 MB | 28 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Mehdi Taghavi](https://appshunter.io/developer/1606532565) | [Berkay Gurcesme](https://appshunter.io/developer/1618081315) |

## What reviewers say

### 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


### 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 Obstetric Calculator Plus free?

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

### Is OB Wheel free?

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

### Which has better reviews, Obstetric Calculator Plus or OB Wheel?

Obstetric Calculator Plus is rated higher. Obstetric Calculator Plus averages 4.7 out of 5 from 7 ratings, while OB Wheel averages 4.3 from 10 ratings.

### Do Obstetric Calculator Plus or OB Wheel have ads?

Neither Obstetric Calculator Plus nor OB Wheel shows ads.

### Which is updated more often, Obstetric Calculator Plus or OB Wheel?

Obstetric Calculator Plus ships an update every 19 months, and OB Wheel every 4 days. Most recently, Obstetric Calculator Plus was updated on November 3, 2026 and OB Wheel on November 4, 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.*