Comparison

ABG Expert vs Rapid Vent Calculator

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

Head to head
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.

About

Rapid Vent Calculator

This medical app assists healthcare professionals in calculating essential ventilator settings and medication dosages for critical care. It provides rapid, accurate results for paramedics, respiratory therapists, nurses, and doctors, streamlining patient management.

Highlights
  • Effortless ventilator settings calculation
  • Rapid results for quick decision-making
  • RSI medication dosage assistant
  • User-friendly interface for medical professionals
  • Accurate patient parameter input
Features
Read full description

Rapid Vent Calculator is a clinician-focused field guide and reference tool for adult ventilator setting calculations, RSI medication dosing, and quick respiratory care references. Designed for paramedics, EMS clinicians, respiratory therapists, nurses, physicians, transport teams, ER teams, ICU clinicians, and hospital-based critical care providers, Rapid Vent Calculator helps organize common ventilator and airway calculations into a fast, practical workflow. Enter patient sex, height, weight, selected mL/kg, and metabolic acidosis status to generate adult starting-point ventilator values including respiratory rate, tidal volume, and minute ventilation. Calculations use ideal body weight and lung-protective ventilation principles for adult ventilator management. Rapid Vent Calculator also includes RSI medication dosing estimates, normal ventilator values, ABG/VBG blood gas reference charts, RASS reference guidance, dark and light mode, recent session resume, and shareable result snapshots. Whether used by EMS in the field, paramedics during transport, nurses and respiratory therapists in the ER, physicians in the hospital, or ICU clinicians managing ventilators, Rapid Vent Calculator is built to keep key adult ventilation references organized and easy to access. Key features: • Adult ventilator setting calculator • Ideal body weight-based tidal volume estimates • Lung-protective mL/kg selector • Respiratory rate, tidal volume, and minute ventilation results • Metabolic acidosis ventilation mode • RSI medication dosing estimates • Normal ventilator values reference • ABG/VBG blood gas reference charts • RASS reference guide • Shareable results snapshot • Dark and light mode • Clinician-focused workflow for EMS, transport, ER, ICU, hospital, and respiratory care use Rapid Vent Calculator is intended as a clinical reference and calculation aid for licensed healthcare professionals caring for adult patients. It is not a protocol, diagnosis tool, treatment directive, or substitute for clinical judgment. All values are starting-point estimates and must be verified against the patient’s condition, local protocols, institutional policy, and clinician scope of practice.

Screenshots

ABG Expert4 screens
Rapid Vent Calculator4 screens

Verdict

The call

The clearest difference is rating: Rapid Vent Calculator at 5.0 against ABG Expert's 4.8. Rapid Vent Calculator also leads on ratings volume (47 vs 9). On price, review sentiment, 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

Rapid Vent Calculator holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Rapid Vent Calculator has 47 ratings behind it against 9, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

ABG Expert ships an update every 5 months, Rapid Vent Calculator every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard2 real differences · 8 level
ABG Expert versus Rapid Vent Calculator: the parameters behind the verdict, then further details
ParameterABG ExpertRapid Vent Calculator
PriceFreeFree
Rating4.8 (9 ratings)5.0 (47 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings947 — better
Update frequencyEvery 5 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size2 MB48 MB
Age rating12+17+
DeveloperBrian Dale Vander Werf MD IncJENCO LLC

Customer experience

ABG Expert

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

Rapid Vent Calculator

All ratings47 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ABG Expert

No in-app purchases

None

Rapid Vent Calculator

No in-app purchases

Questions

Is ABG Expert free?
ABG Expert is free to download, with no in-app purchases.
Is Rapid Vent Calculator free?
Rapid Vent Calculator is free to download, with no in-app purchases.
Which has better reviews, ABG Expert or Rapid Vent Calculator?
Rapid Vent Calculator is rated higher. ABG Expert averages 4.8 out of 5 from 9 ratings, while Rapid Vent Calculator averages 5.0 from 47 ratings.
Do ABG Expert or Rapid Vent Calculator have ads?
Neither ABG Expert nor Rapid Vent Calculator shows ads.
Which is updated more often, ABG Expert or Rapid Vent Calculator?
ABG Expert ships an update every 5 months, and Rapid Vent Calculator every 4 months. Most recently, ABG Expert was updated on November 1, 2026 and Rapid Vent Calculator on November 3, 2026.

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