Comparison

ABG Acid vs ABGs NOW! Lite

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

Head to head
About

ABG Acid

This app guides clinicians through analyzing ABGs and electrolytes to identify acid-base disorders and diagnostic ideas for ill patients. It teaches a stepwise thinking process and provides differential diagnoses with explanations, aiding patient care and clinician learning.

Highlights
  • Stepwise ABG and electrolyte analysis
  • Identifies acid-base disorders
  • Provides diagnostic ideas
  • Teaches critical thinking process
  • Includes differential diagnoses mnemonics
  • Calculates predicted pCO2 and corrected bicarbonate
Features
Read full description

ABG Acid-Base eval walks a clinician through a stepwise approach to analyse ABG's and electrolytes in order to arrive at acid-base disorders and diagnostic ideas about ill patients. It is based mainly upon a worksheet developed by Dr. Erik Rupard from the medical literature. This tool not only yields answers, but just as importantly teaches the stepwise thinking process and the necessary concepts along the way. A clinician or learner will wind up with good information that assists patient care and should wind up a little smarter and more able to do it with less assistance the next time. It is a great support for those of us clinicians who use these tests only occasionally and don't have it memorized. The differential diagnoses include the classic mnemonics like MUDPILERS, CHAMPS, CLEVER PD, and HARDUPS, with explanations and examples. The app addresses such common questions as: * What are common causes of metabolic acidosis? respiratory alkalosis? * How do I calculate predicted pCO2? corrected bicarbonate? * What is the primary acid-base disorder? * Are additional acid-base disorders present, and if so, what are they? This app is written and intended for practicing clinicians like internists, family physicians, ER docs, cardiologists, pulmonologists, intensivists, and hospitalists; for resident physician trainees; for medical students; and of course for other clinician colleagues like NP's and PA's. As an educator and clinician, I am interested in feedback and I would be grateful for guidance on improving the tool. Notes of importance: - many thresholds and cutoffs are arbitrary and debatable, so you will have to use judgment to interpret which disorders are present and to what extent when suggested by the app - the app facilitates you to evaluate the data. If you make a mistake, the app will not argue with you. It will, at the end, offer to compare your work to the disorders that the app finds using the same algorithm - patients are more than the sums of their numbers and data, and they are often unique individuals. Use this information as a starting point in the evaluation of your patient and always do your own thinking!

About

ABGs NOW! Lite

Master arterial blood gas interpretation with this engaging medical app. It offers a calculator for quick answers, practice modes with hints, and a challenge mode to test your skills. Detailed analysis is provided for any incorrect interpretations.

Highlights
  • ABG Calculator
  • Practice Mode with Hints
  • Challenge Mode
  • Detailed Analysis
  • Knowledge Strengthening
Features
Read full description

ABGs NOW!™ is a fun, engaging way for both students and professionals to strengthen their knowledge of arterial blood gases. The app features a calculator, providing immediate answers, a practice mode that guides the learner with helpful hints, and a challenge mode where learners can put their ABG skills to the test. Both practice and challenge modes provide detailed analysis for any missed interpretations. ​ ABGs NOW!™ offers an entertaining way to learn a challenging topic.

Screenshots

ABG Acid4 screens
ABGs NOW! Lite4 screens

Verdict

The call

The clearest difference is review sentiment: ABG Acid at 63% against ABGs NOW! Lite's 0%. ABG Acid also leads on rating (4.6 vs 3.2) and ads (none vs shown). ABGs NOW! Lite's advantage is monetization model (ad-supported vs paid) and update cadence (every 2 months vs every 5 months). On price, ratings volume, in-app purchases and device support 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

ABG Acid holds the better App Store score, 4.6 against 3.2. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews point the same way: 63% of ABG Acid's written reviews are positive against 0% of ABGs NOW! Lite's.

UpkeepUpdate frequency

ABG Acid ships an update every 5 months, ABGs NOW! Lite every 2 months. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

Scorecard6 real differences · 4 level
ABG Acid versus ABGs NOW! Lite: the parameters behind the verdict, then further details
ParameterABG AcidABGs NOW! Lite
PriceFreeFree
Rating4.6 (7 ratings) — better3.2 (5 ratings)
Positive reviews63.0% of reviews — better0.0% of reviews
Number of ratings7 — better5
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.0 — better15.0
Further details — not scored
Size1 MB94 MB
Age rating17+12+
DeveloperJoshua D. steinbergBytewise Studios, LLC

Customer experience

ABG Acid

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews46 reviews
Positive63.0%
Neutral2.2%
Negative34.8%

ABGs NOW! Lite

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

ABG Acid

No in-app purchases

None

ABGs NOW! Lite

No in-app purchases

Questions

Is ABG Acid free?
ABG Acid is free to download, with no in-app purchases.
Is ABGs NOW! Lite free?
ABGs NOW! Lite is free to download, with no in-app purchases.
Which has better reviews, ABG Acid or ABGs NOW! Lite?
ABG Acid is rated higher. ABG Acid averages 4.6 out of 5 from 7 ratings, while ABGs NOW! Lite averages 3.2 from 5 ratings.
Do ABG Acid or ABGs NOW! Lite have ads?
ABGs NOW! Lite shows ads; ABG Acid does not.
Which is updated more often, ABG Acid or ABGs NOW! Lite?
ABG Acid ships an update every 5 months, and ABGs NOW! Lite every 2 months. Most recently, ABG Acid was updated on October 23, 2026 and ABGs NOW! Lite on October 27, 2026.

Other comparisons