Comparison

ACLS Rhythms and Quiz vs arrhythmia

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

Head to head
About

ACLS Rhythms and Quiz

This app helps healthcare professionals recognize and understand ACLS arrhythmias through dynamic movies and quizzes. It provides essential information for managing cardiac arrest events and preparing for ACLS renewal exams.

Highlights
  • Dynamic movies simulating clinical practice
  • Cardioversion movies with post-cardioversion scenarios
  • Real-life rhythms with monitor alarms and sounds
  • Comprehensive ACLS Rhythms Exam
  • Details on ACLS medications
  • Guidelines for adult cardiac arrest management
Features
Read full description

"Best ACLS App for the iPhone" - ACLS RHYTHMS AND QUIZ ACLS Rhythms and Quiz is one of the first and still THE BEST ACLS App on the Apple App Store. ACLS Rhythms and Quiz - REVIEWS -Dynamic movies simulate real-life clinical practice, with all the alarms and noises to recreate a stressful environment. ACLS Rhythms is a fantastic way to learn! -The Cardioversion movies are fantastic! This app is an Excellent Reference & Teaching Aid for Adult Cardiac Life Support, ACLS Rhythms & Quiz is produced by two practicing Anesthesiologists using real-life scenarios from our 20 years of clinical experience. Not a basic ACLS algorithm app or simulator, instead ACLS Rhythms & Quiz is an App designed to help you recognize and understand ACLS arrhythmias. ACLS instructors around the country use ACLS Rhythms and Quiz to teach rhythm recognition in their classes. ACLS Rhythms & Quiz provides all the information you need at the bedside to run the code like a pro during any ACLS event. No need to carry around sets of algorithm cards or cheat sheets. Our quiz function makes test prep a breeze when it is time to renew your ACLS every two years. Purchase once and be prepared for the rest of your career as we update the app with AHA Guideline Updates. -Beautiful HD Movies designed specifically for Retina Displays -Textbook examples of common arrhythmia's -Real Life rhythms with pulse oximetry tones, defibrillation noises & monitor alarms -Each movie is complete with pearls for identification -Comprehensive ACLS Rhythms Exam to test your understanding -Details common ACLS medications, doses, & method of action -Guidelines for the management of Adult Cardiac Arrest -Comprehensive ACLS App Life-like electrocardiograms with pulse oximetry tones, defibrillation noises, and monitor alarms add realism to your interpretation and learning. Learn rhythms faster using sight and sound!! Our one of a kind cardioversion movies allows you to watch ACLS rhythms and witness post cardioversion scenarios. Soon to be your favorite ACLS app! P.S. As healthcare professionals ourselves, we will not nickel and dime you with an outrageous price or monthly subscriptions. Purchase once and get all our yearly ACLS updates and additional quiz questions free. NOTE: We have made all movies to be an accurate representation of specified arrhythmia as possible. Due to the variability of “real life” and context of the screen, there may be small variations in intervals and measurements from a textbook 12-lead ECG of these arrhythmias. Help us make this app better for you. We love feedback, and please send us your suggestions.

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
Read full description

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

Screenshots

ACLS Rhythms and Quiz4 screens
arrhythmia4 screens

Verdict

The call

The clearest difference is price: arrhythmia at Free against ACLS Rhythms and Quiz's $9.99. ACLS Rhythms and Quiz's advantage is rating (4.7 vs 4.1) and in-app purchases (none vs 3). On review sentiment, ratings volume, 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

arrhythmia is free to download; ACLS Rhythms and Quiz costs $9.99 up front. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. ACLS Rhythms and Quiz asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ACLS Rhythms and Quiz holds the better App Store score, 4.7 against 4.1. Both are backed by a comparable volume of ratings — 201 and 113 respectively. Written reviews complicate that: 39% of ACLS Rhythms and Quiz's written reviews are positive against 44% of arrhythmia's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. Both last shipped on November 1, 2026.

Scorecard5 real differences · 5 level
ACLS Rhythms and Quiz versus arrhythmia: the parameters behind the verdict, then further details
ParameterACLS Rhythms and Quizarrhythmia
Price$9.99Free — better
Rating4.7 (201 ratings) — better4.1 (113 ratings)
Positive reviews39.3% of reviews43.9% of reviews — better
Number of ratings201 — better113
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS11.0 — better17.6
Further details — not scored
Size204 MB159 MB
Age rating+1717+
DeveloperiAnesthesia LLCSingle Sail Software, LLC

Customer experience

ACLS Rhythms and Quiz

All ratings199 ratings
Positive92.5%
Neutral3.0%
Negative4.5%
Written reviews28 reviews
Positive39.3%
Neutral14.3%
Negative46.4%

arrhythmia

All ratings111 ratings
Positive80.2%
Neutral4.5%
Negative15.3%
Written reviews41 reviews
Positive43.9%
Neutral7.3%
Negative48.8%

User reviews

ACLS Rhythms and Quiz

From 201 App Store ratings

What we love

  • 👍 Great app for medical professionals
  • 👍 Helpful for ACLS class review
  • 👍 Drug section is very helpful
  • 👍 Good for nursing students
  • 👍 Organized and informative

Room to improve

  • 🐛 No 'next question' button in quizzes
  • 🐛 Spelling errors
  • 🐛 App needs updating for compatibility
  • 🐛 Crashes frequently
  • 🐛 Expensive for limited functionality

arrhythmia

From 113 App Store ratings

What we love

  • 👍 Great study tool for EKGs
  • 👍 Helpful for understanding EKGs
  • 👍 Good for practicing rhythm recognition
  • 👍 Interactive and colorful design
  • 👍 Dynamic testing

Room to improve

  • 👎 Immediately asks for paid version
  • 👎 Missing common and important rhythms
  • 👎 Rhythms are unrealistic
  • 👎 Cannot try before signing up
  • 👎 Clunky and slow horizontal scrolling

Bugs and requests

ACLS Rhythms and Quiz

Reported bugs

11 issues
  • No 'next question' button
  • Spelling errors
  • Compatibility issues with newer iOS versions
  • Frequent crashes
  • App stops working after download
Show 6 more
  • Videos do not play
  • Quiz freezes and is unresponsive
  • Cardiac rhythms are too small and lack assessment lines
  • Answers are provided prematurely
  • App does not allow image zooming
  • Inconsistent quiz results (all answers correct)

Requested features

13 requests
  • Add a 'next question' button for quizzes
  • Fix spelling errors
  • Update the app for current iOS compatibility
  • Add buttons for describing characteristics of each rhythm
  • More detailed drug information (contraindications, dosing)
Show 8 more
  • Show ECG effect of drugs
  • Show ACLS algorithm in action with patient feedback
  • More examples of each rhythm
  • Improve quiz functionality and challenge
  • Allow image zooming for rhythms
  • Include more algorithms
  • Fix video playback issues
  • Fix quiz freezing issues

arrhythmia

Reported bugs

2 issues
  • App no longer works after iOS update
  • App does not work on Apple Watch

Requested features

11 requests
  • Add more common and important rhythms (torsades, WPW, STEMI, accelerated/tachycardic idioventricular, WAP, MAT)
  • Option to read as a 12-lead instead of a single rhythm line
  • Add variations to rhythms
  • Add Left Bundle Branch Block
  • Add a 12-lead option
Show 6 more
  • Add more examples for each rhythm
  • Add a list view option for rhythms
  • Add an explanation/rationale for correct/incorrect answers
  • Add an animation showing what is happening in the heart when an answer is wrong
  • Add tutorial or information on how to use the app
  • Add 'Non-Conducted' PACs and similar rhythms

In-app purchases

None

ACLS Rhythms and Quiz

No 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

Questions

Is ACLS Rhythms and Quiz free?
ACLS Rhythms and Quiz costs $9.99, with no in-app purchases.
Is arrhythmia free?
arrhythmia is free to download, with in-app purchases available.
Which has better reviews, ACLS Rhythms and Quiz or arrhythmia?
ACLS Rhythms and Quiz is rated higher. ACLS Rhythms and Quiz averages 4.7 out of 5 from 201 ratings, while arrhythmia averages 4.1 from 113 ratings.
Do ACLS Rhythms and Quiz or arrhythmia have ads?
Neither ACLS Rhythms and Quiz nor arrhythmia shows ads.
Which is updated more often, ACLS Rhythms and Quiz or arrhythmia?
ACLS Rhythms and Quiz ships an update every 3 weeks, and arrhythmia every 3 weeks. Most recently, ACLS Rhythms and Quiz was updated on November 1, 2026 and arrhythmia on November 1, 2026.

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