Comparison

ACOG vs ABG Expert

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

Head to head
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!

About

ABG Expert

This medical tool provides accurate and flexible acid-base analysis for healthcare professionals. It offers detailed explanations, customizable ranges, and advanced features like anion gap correction and A-a gradient adjustments for various patient conditions and locations.

Highlights
  • Validated accuracy with real-world testing
  • Plausibility checks for physiologically impossible data
  • Automatic anion gap correction with albumin
  • Detailed explanations with equations
  • Separate or combined analysis of ABG, anion gap, A-a gradient
  • Customizable normal ranges for anion gap and delta gap
  • Age and barometric pressure adjustments for A-a gradient
  • Support for SI and non-SI units
  • Color-coded results and differential diagnoses
  • Adjustments for chronic respiratory conditions
Features
Read full description

ABG Expert™ is simply the best acid-base analysis tool with features available in no other app. Designed and tested by practicing physicians, ABG Expert is trusted by medical professionals for unparalleled accuracy, flexibility, and power while remaining completely intuitive to use. Whether you are a physician, nurse, respiratory therapist, paramedic, or student, ABG Expert is your ideal acid base analysis app. Accuracy- • ABG Expert has been validated using extensive testing under real-world conditions. • No need to worry about entering physiologically impossible data by mistake. Data is checked for plausibility and for internal consistency using the Henderson-Hasselbalch equation. • An accurate analysis depends on an accurate anion gap. ABG Expert has you covered with automatic correction of the anion gap when albumin is provided. • Never again wonder about how a result was obtained. Detailed explanations include easy-to-understand equations so you can be sure the calculations are correct. Flexibility- • Need the arterial blood gas analysis, but not the anion gap or A-a gradient? No problem. ABG Expert can analyze the data for all three results separately or together. • Set the normal anion gap range based on the normal range at your institution. Or, use your patient’s own baseline anion gap to maximize your sensitivity to detect disorders. • Caring for an 80-year-old patient in Denver? Provide age and barometric pressure, and ABG Expert automatically adjusts interpretation of the A-a gradient. • Need more specificity? Adjust the normal delta gap range based on the literature you follow in your practice. • ABG Expert works as well in Bangkok as it does in Boston with full support for SI and non-SI units. Power- • Color-coded results allow for rapid analysis in critical situations. One additional click gives you a detailed differential diagnosis and additional recommendations. • Concerned about a new problem in your patient with advanced COPD? ABG Expert can adjust its calculations for chronic respiratory conditions so you can detect additional disorders that are missed by other apps. • Detailed explanations of disorders integrate ABG, anion gap, and A-a gradient results providing individualized answers like no textbook can. • Refine your differential diagnosis even further with the included osmolal gap and urine anion gap calculators. • ABG Expert combines beauty and brains with optimization for iOS devices running iOS 13 and later. Disclaimer: Brian Dale Vander Werf MD Inc. has made every effort to ensure the accuracy of the information included in this product. However, the authors, developers, and Brian Dale Vander Werf MD Inc. are not responsible for errors or omissions or for any consequences from the use of this product and make no warranty, expressed or implied, with respect to the currency, completeness, or accuracy of the contents of this product. This product has been designed as a supplemental source of information for medical professionals. This product is not a substitute for clinical judgment, and the use of the information produced by this product in a particular situation remains the responsibility of the medical professional. Privacy Policy: This product does not collect, store, or transmit individually identifiable health information. References: NEJM. 2014; 371: 1434. Medicine. 1980; 59(3): 161. Kidney International. 2009; 76: 1239. Emerg Med. 1990; 19: 1310. Clin J Am Soc Nephrol. 2007; 2: 162. Nat Rev Nephrol. 2010; 6: 274. Anaesthesia. 2008; 63: 294. Clin J Am Soc Nephrol. 2012; 7: 671. The ICU Book. 3rd ed. Lippincott Williams & Wilkins; 2007.

Screenshots

ACOG4 screens
ABG Expert4 screens

Verdict

The call

The clearest difference is ratings volume: ACOG at 6.3K against ABG Expert's 9. ABG Expert's advantage is review sentiment (100% vs 90%) and iOS requirement (13.0 vs 17.0). On price, rating, update cadence and ads 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 — 4.9 for ACOG against 4.8 for ABG Expert. That said, the two scores are not equally well evidenced: ACOG has 6.3K ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 90% of ACOG's written reviews are positive against 100% of ABG Expert's.

UpkeepUpdate frequency

ACOG ships an update every 3 months, ABG Expert every 5 months. The most recent releases landed on October 18, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
ACOG versus ABG Expert: the parameters behind the verdict, then further details
ParameterACOGABG Expert
PriceFreeFree
Rating4.9 (6.3K ratings) — better4.8 (9 ratings)
Positive reviews89.6% of reviews100.0% of reviews — better
Number of ratings6.3K — better9
Update frequencyEvery 3 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size29 MB2 MB
Age rating17+12+
DeveloperFountainhead Mobile SolutionsBrian Dale Vander Werf MD Inc

Customer experience

ACOG

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

ABG Expert

All ratings9 ratings
Positive88.9%
Neutral11.1%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and 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

ABG Expert

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

ACOG

No in-app purchases

None

ABG Expert

No in-app purchases

Questions

Is ACOG free?
ACOG is free to download, with no in-app purchases.
Is ABG Expert free?
ABG Expert is free to download, with no in-app purchases.
Which has better reviews, ACOG or ABG Expert?
ACOG is rated higher. ACOG averages 4.9 out of 5 from 6.3K ratings, while ABG Expert averages 4.8 from 9 ratings.
Do ACOG or ABG Expert have ads?
Neither ACOG nor ABG Expert shows ads.
Which is updated more often, ACOG or ABG Expert?
ACOG ships an update every 3 months, and ABG Expert every 5 months. Most recently, ACOG was updated on October 18, 2026 and ABG Expert on October 3, 2026.

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