Comparison

WUSM OB Calc vs ACOG

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

WUSM OB Calc

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
Read full description

There are few clinical decision support tools available for OBGYNs. Those that exist remain web-based and have little value beyond gestational age or Bishop score calculation. To compliment our WUSM OB GUIDE, we introduce the WUSM OB CALC, which provides instant clinical support for five common areas: 1) Determining a patient’s success rate for VBAC 2) Determining the risk for Down syndrome based on the presence of ultrasound markers 3) Management for pregnancy of unknown location 4) Body surface area calculation and methotrexate dosing 5) Intrauterine growth restriction calculation and management As with the WUSM OB GUIDE, the data to support these models are evidence based and are drawn from the literature and expert opinion. Ultrasound technicians, triage nurses and providers of ALL levels will find this tool useful, not just in OBGYN but also in emergency medicine. Copyright 2013: The WUSM OB Calculator is a copyrighted instrument of Washington University, St. Louis , Missouri and the developer Muhammad H. Alsharif. Permission Statement: Washington University grants permission to use and reproduce the WUSM OB Calculator exactly as it appears here without modification or editing of any kind solely for end user use in clinical care or research in clinical care or research (the “Purpose”). For the avoidance of doubt, the Purpose does not include the (i) sale, distribution or transfer of the WUSM OB Calculator or copies thereof for any consideration or commercial value; (ii) the creation of any derivative works, including translations; and/or (iii) use of the WUSM OB Calculator as a marketing tool for the sale of any drug. Disclaimer: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, OR THAT THE USE OF THE SOFTWARE WILL NOT INFRINGE ANY PATENT COPYRIGHT, TRADEMARK, OR OTHER PROPRIETARY RIGHTS ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Medical Contributors: Dr. Anthony Shanks, MD, Assistant Professor, Maternal Fetal Medicine Dr. Kenan Omurtag, MD, Fellow, Reproductive Endocrinology and Infertility Medical References: VBAC calculator: Grobman WA, et al. Development of a nomogram for prediction of vaginal birth after cesarean delivery. Obstet Gynecol. 2007;109:806-12. Down Syndrome: Nyberg DA et al. Isolated Sonographic Markers for Detection of Fetal Down Syndrome in the Second trimester of pregnancy. 2001;20:1053-63. Ectopic Calculator: Condous G, Okaro E, Khalid A, Bourne T. Do we need to follow up complete miscarriages with serum human chorionic gonadotrophin levels? BJOG 2005;112:827- 829. Barnhart KT, Sammel MD, Gracia CR, Chittams J, Hummel AC, Shaunik A. Risk factors for ectopic pregnancy in women with symptomatic first- trimester pregnancies. Fertil Steril 2006;86:36-43. Barnhart KT. Clinical practice. Ectopic pregnancy. 2009;361:379-87 Barnhart KT, Sammel MD, Rinaudo PF, Zhou L, Hummel AC, Guo W. Symptomatic patients with an early viable intrauterine pregnancy: HCG curves redefined. Obstet Gynecol 2004;104:50-5 Additional – See in app data BSA /MTX Calculator: The Mosteller Formula: http://www.halls.md/body-surface-area/refs.htm ACOG Practice Bulletin. Medical management of ectopic pregnancy. Obstet Gynecol 2008; 111:1479-85.

About

ACOG

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
Read full description

The American College of Obstetricians and Gynecologists Ob-Gyns: Download the ACOG app and stay connected with authoritative information from the leading experts in women’s health care. Get valuable tools, resources, and clinical guidelines to help you in your practice. • EDD Calculator – Calculate the due date according to guidelines jointly developed by ACOG, AIUM, and SMFM • Indicated Delivery (ACOG members only) – Provides members with suggestions related to the timing of delivery based on selected conditions, the patient’s EDD/EGA, and ACOG’s clinical guidance • Clinical Consensus, Clinical Practice Guidelines, and Practice Advisories – Get the latest on techniques, clinical management issues, and emerging issues in obstetric and gynecologic practice • And more!

Screenshots

WUSM OB Calc4 screens
ACOG4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard3 real differences · 7 level
WUSM OB Calc versus ACOG: the parameters behind the verdict, then further details
ParameterWUSM OB CalcACOG
PriceFreeFree
Rating5.0 (1 ratings) — better4.9 (6.3K ratings)
Positive reviews—89.6% of reviews
Number of ratings16.3K — better
Update frequencyEvery 7 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS7.0 — better17.0
Further details — not scored
Size1 MB29 MB
Age rating17+17+
DeveloperWashington University in St. LouisFountainhead Mobile Solutions

Customer experience

WUSM OB Calc

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

ACOG

All ratings6,335 ratings
Positive99.2%
Neutral0.5%
Negative0.3%
Written reviews48 reviews
Positive89.6%
Neutral4.2%
Negative6.3%

Bugs and requests

WUSM OB Calc

Not enough reviews yet to summarise bugs or requests.

ACOG

Reported bugs

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

Requested features

3 requests
  • Bishop score calculator
  • More extensive search engine
  • Improved user interface

In-app purchases

None

WUSM OB Calc

No in-app purchases

None

ACOG

No in-app purchases

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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