Comparison

arrhythmia vs ABGs NOW!

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

Head to head
About

arrhythmia

Practice interpreting EKGs in lead II with realistic simulations. Choose rhythms to study or test your knowledge in a game mode. Ideal for healthcare professionals to hone their diagnostic skills.

Highlights
  • EKG interpretation practice
  • Lead II simulation
  • Study Mode with rhythm selection
  • Game Mode for random rhythm identification
  • Customizable rhythm sets
  • Realistic rhythm variations
Currently charting
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Practice reading EKGs in lead II Basic EKG interpretation is more accurately described as an intermediate level skill that takes time, practice and refreshing. Whether you are a doctor, nurse, EMT or tech your ability to read and pickup on basic EKG changes in real time is essential. Practice with an app that actually looks like what you see at work. Use the app’s ‘Study Mode’ to choose one or multiple rhythms to view and compare. A brief description of each rhythm is provided, you can also pause and restart rhythms. Delete and add specific rhythms as desired. Rates, amplitudes and widths of the rhythms are dynamically set which provides for a more realistic simulation and variation within each type of rhythm. Use the app’s ‘Game Mode’ to challenge yourself to identify rhythms presented randomly in lead II. If desired, you can also custom specify which rhythms to include in the game. Access to Study Mode and Game Mode requires a subscription via in-app purchase. Please Read: The purpose of this app is not to teach basic EKG interpretation but rather to practice basic EKG interpretation. If you don’t know basic EKG interpretation seek out additional resources such as classes, books, online materials and mentors to learn more and further your understanding. Note: The cardiac rhythms presented by the app are simulated approximations. There is NO guarantee to the accuracy of rhythms presented. While accuracy is not guaranteed it is a goal. Please report errors, suggestions or general feedback to: feedback@arrhythmiaApp.com. Arrhythmia uses the standard Apple Terms of Use End User License Agreement (EULA): http://www.apple.com/legal/itunes/appstore/dev/stdeula

About

ABGs NOW!

Master arterial blood gas interpretation with this interactive tool. It offers a calculator for quick answers, practice sessions with hints, and a challenge mode to test your skills. Detailed analysis is provided for any errors, making learning engaging.

Highlights
  • ABG Calculator
  • Practice Mode with Hints
  • Challenge Mode
  • Detailed Analysis
  • Knowledge Strengthening
Features
Currently charting
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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

arrhythmia4 screens
ABGs NOW!4 screens

Verdict

The call

The clearest difference is price: arrhythmia at Free against ABGs NOW!'s $0.99. arrhythmia also leads on ratings volume (111 vs 2) and update cadence (every 3 weeks vs every 2 months). ABGs NOW!'s advantage is rating (5.0 vs 4.2) and in-app purchases (none vs 3). On ads, chart position 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

arrhythmia is free to download; ABGs NOW! costs $0.99 up front. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. ABGs NOW! asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ABGs NOW! holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: arrhythmia has 111 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

arrhythmia ships an update every 3 weeks, ABGs NOW! every 2 months. The most recent releases landed on September 21, 2026 and September 5, 2026 respectively.

Scorecard7 real differences · 4 level
arrhythmia versus ABGs NOW!: the parameters behind the verdict, then further details
ParameterarrhythmiaABGs NOW!
PriceFree — better$0.99
Rating4.2 (111 ratings)5.0 (2 ratings) — better
Positive reviews45.0% of reviews—
Number of ratings111 — better2
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationSubscriptionPaid — better
Best chart rank#188 — better#194
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.610.0 — better
Further details — not scored
Size159 MB161 MB
Age rating17+12+
DeveloperSingle Sail Software, LLCBytewise Studios, LLC

Customer experience

arrhythmia

All ratings111 ratings
Positive80.2%
Neutral4.5%
Negative15.3%
Written reviews40 reviews
Positive45.0%
Neutral7.5%
Negative47.5%

ABGs NOW!

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

arrhythmia

Subscriptions2
  • Monthly7 Days trial$2.991 Month
  • Yearly7 Days trial$19.991 Year
One-time1
  • Unlock All Rhythms (One-time Purchase)$4.99
None

ABGs NOW!

No in-app purchases

Questions

Is arrhythmia free?
arrhythmia is free to download, with in-app purchases available.
Is ABGs NOW! free?
ABGs NOW! costs $0.99, with no in-app purchases.
Which has better reviews, arrhythmia or ABGs NOW!?
ABGs NOW! is rated higher. arrhythmia averages 4.2 out of 5 from 111 ratings, while ABGs NOW! averages 5.0 from 2 ratings.
Do arrhythmia or ABGs NOW! have ads?
Neither arrhythmia nor ABGs NOW! shows ads.
Which is updated more often, arrhythmia or ABGs NOW!?
arrhythmia ships an update every 3 weeks, and ABGs NOW! every 2 months. Most recently, arrhythmia was updated on September 21, 2026 and ABGs NOW! on September 5, 2026.
Which is more popular, arrhythmia or ABGs NOW!?
arrhythmia currently peaks at #188 in the App Store charts, and ABGs NOW! at #194. Chart position reflects recent download velocity rather than total install base.

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