# WUSM OB Calc vs ACOG

The clearest difference is ratings volume: ACOG at 6.3K against WUSM OB Calc's 1. ACOG also leads on update cadence (every 3 months vs every 7 months). WUSM OB Calc's advantage is iOS requirement (7.0 vs 17.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for WUSM OB Calc against 4.9 for ACOG. That said, the two scores are not equally well evidenced: ACOG has 6.3K ratings behind it against 1, so its average is the more settled of the two.

WUSM OB Calc ships an update every 7 months, ACOG every 3 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | WUSM OB Calc | ACOG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/wusm-ob-calc/id600123897/reviews)** | [4.9 (6.3K ratings)](https://appshunter.io/ios/app/acog/id616323665/reviews) |
| Number of ratings | 1 | **6.3K** |
| Positive reviews | — | 89.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 1 MB | 29 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Washington University in St. Louis](https://appshunter.io/developer/431339390) | [Fountainhead Mobile Solutions](https://appshunter.io/developer/1113758990) |

## What reviewers say

### WUSM OB Calc

[App page](https://appshunter.io/ios/app/wusm-ob-calc/id600123897)

This medical tool provides instant clinical support for OBGYNs and other healthcare professionals. It offers calculations and management guidance for common areas like VBAC success rates, Down syndrome risk, and intrauterine growth restriction. Data is evidence-based, drawn from literature and expert opinion.

**Highlights:** VBAC success rate determination, Down syndrome risk assessment, Pregnancy of unknown location management, Body surface area and methotrexate dosing, Intrauterine growth restriction calculation

**Features:** macOS Compatibility

**In-app purchases:** none


### ACOG

[App page](https://appshunter.io/ios/app/acog/id616323665)

This app provides obstetricians and gynecologists with essential tools and resources for women's healthcare. Access clinical guidelines, practice advisories, and helpful calculators to support your medical practice.

**Highlights:** EDD Calculator, Indicated Delivery tool (members only), Clinical Consensus documents, Clinical Practice Guidelines, Practice Advisories

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick access to clinical guidance
- 👍 Well-organized and easy to navigate
- 🔍 Convenient way to stay up-to-date with guidelines
- ⚡ Essential for OB-GYNs and providers
- 📚 Excellent resource for clinical reference

**What reviewers complain about**

- 🐛 Occasional crashes and compatibility issues
- 🔍 Could use more advanced search functionality
- 👨‍⚕️ Requires ACOG membership to access full features

**Reported bugs**

- App crashes on launch after updates
- Compatibility issues with older iOS versions

**Requested features**

- Bishop score calculator
- More extensive search engine
- Improved user interface


## Frequently asked questions

### Is WUSM OB Calc free?

WUSM OB Calc is free to download, with no in-app purchases.

### Is ACOG free?

ACOG is free to download, with no in-app purchases.

### Which has better reviews, WUSM OB Calc or ACOG?

WUSM OB Calc is rated higher. WUSM OB Calc averages 5.0 out of 5 from 1 ratings, while ACOG averages 4.9 from 6.3K ratings.

### Do WUSM OB Calc or ACOG have ads?

Neither WUSM OB Calc nor ACOG shows ads.

### Which is updated more often, WUSM OB Calc or ACOG?

WUSM OB Calc ships an update every 7 months, and ACOG every 3 months. Most recently, WUSM OB Calc was updated on November 1, 2026 and ACOG on November 1, 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.*