# Perinatal Calculators vs OB Wheel

The clearest difference is rating: Perinatal Calculators at 5.0 against OB Wheel's 4.3. Perinatal Calculators also leads on in-app purchases (none vs 2). OB Wheel's advantage is update cadence (every 4 days vs monthly) and ratings volume (10 vs 2). On price, ads, monetization model and device support there is nothing between them.

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

Perinatal Calculators holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: OB Wheel has 10 ratings behind it against 2, so its average is the more settled of the two.

Perinatal Calculators ships an update monthly, OB Wheel every 4 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Perinatal Calculators | OB Wheel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/perinatal-calculators/id959395503/reviews)** | [4.3 (10 ratings)](https://appshunter.io/ios/app/ob-wheel/id6473123188/reviews) |
| Number of ratings | 2 | **10** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Free | Free |
| Size | 2 MB | 28 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [David Deschamps](https://appshunter.io/developer/959395502) | [Berkay Gurcesme](https://appshunter.io/developer/1618081315) |

## What reviewers say

### Perinatal Calculators

[App page](https://appshunter.io/ios/app/perinatal-calculators/id959395503)

This app provides essential obstetrical and perinatal calculators for healthcare providers. It aids in patient counseling with tools for assessing risks like extreme prematurity and Down Syndrome, and managing conditions like gestational diabetes. All calculations are performed locally without an internet connection.

**Highlights:** Extreme prematurity calculator, VBAC success calculators, Down Syndrome risk assessment, Gestational diabetes insulin calculation, CCAMs CVR calculator, Offline functionality

**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 Perinatal Calculators free?

Perinatal Calculators 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, Perinatal Calculators or OB Wheel?

Perinatal Calculators is rated higher. Perinatal Calculators averages 5.0 out of 5 from 2 ratings, while OB Wheel averages 4.3 from 10 ratings.

### Do Perinatal Calculators or OB Wheel have ads?

Neither Perinatal Calculators nor OB Wheel shows ads.

### Which is updated more often, Perinatal Calculators or OB Wheel?

Perinatal Calculators ships an update monthly, and OB Wheel every 4 days. Most recently, Perinatal Calculators was updated on November 1, 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.*