WUSM OB Calc vs ACOG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- VBAC success rate determination
- Down syndrome risk assessment
- Pregnancy of unknown location management
- Body surface area and methotrexate dosing
- Intrauterine growth restriction calculation
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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.
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.
- EDD Calculator
- Indicated Delivery tool (members only)
- Clinical Consensus documents
- Clinical Practice Guidelines
- Practice Advisories
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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
Verdict
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
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.
| Parameter | WUSM OB Calc | ACOG |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.9 (6.3K ratings) |
| Positive reviews | — | 89.6% of reviews |
| Number of ratings | 1 | 6.3K — better |
| Update frequency | Every 7 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 7.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 29 MB |
| Age rating | 17+ | 17+ |
| Developer | Washington University in St. Louis | Fountainhead Mobile Solutions |
Customer experience
WUSM OB Calc
ACOG
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
WUSM OB Calc
No in-app purchases
ACOG
No in-app purchases
Questions
Is WUSM OB Calc free?
Is ACOG free?
Which has better reviews, WUSM OB Calc or ACOG?
Do WUSM OB Calc or ACOG have ads?
Which is updated more often, WUSM OB Calc or ACOG?
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