Comparison

ECG Challenge vs arrhythmia

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

Head to head
About

ECG Challenge

This app offers over 150 real-world ECG strips for medical professionals and students to practice and improve their interpretation skills. It provides detailed rationales and personalized study options to build confidence and enhance patient care.

Highlights
  • 150+ real-world ECG strips
  • Detailed rationales
  • Personalized study options
  • Progress tracking
  • Clinically obtained ECGs
Features
Currently charting
Read full description

Sharpen Your ECG Interpretation Skills – Anytime, Anywhere Master the art of ECG interpretation with ECG Challenge, the go-to app for paramedics, nurses, medical students, and physicians. Created by Dawn Altman, a highly respected nurse, paramedic, and the ECG Guru, this app features over 150 real-world, clinically obtained ECGs to help you build confidence, improve accuracy, and enhance patient care. Why Choose ECG Challenge? Real-World Practice – Work with authentic ECG strips based on actual clinical cases. Smart Learning Tools – Gain deeper understanding with detailed rationales and helpful hints. Personalized Study Experience – Choose between random review or structured challenges to match your learning style. Track Your Progress – The “Mastered It” feature allows you to focus on areas that need more attention. Built with Limmer Education’s trusted review technology, ECG Challenge delivers a dynamic, effective, and engaging way to refine your ECG interpretation skills—so you can make confident, accurate decisions in real-world scenarios. Download today and take your ECG skills to the next level.

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

ECG Challenge4 screens
arrhythmia4 screens

Verdict

The call

The clearest difference is review sentiment: ECG Challenge at 100% against arrhythmia's 44%. ECG Challenge also leads on rating (5.0 vs 4.1) and in-app purchases (none vs 3). arrhythmia's advantage is price (Free vs $5.99) and update cadence (every 3 weeks vs every 11 months). On ads, device support and iOS requirement 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; ECG Challenge costs $5.99 up front. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. ECG Challenge asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ECG Challenge holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: arrhythmia has 113 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of ECG Challenge's written reviews are positive against 44% of arrhythmia's.

UpkeepUpdate frequency

ECG Challenge ships an update every 11 months, arrhythmia every 3 weeks. The most recent releases landed on October 22, 2026 and October 21, 2026 respectively.

Scorecard8 real differences · 3 level
ECG Challenge versus arrhythmia: the parameters behind the verdict, then further details
ParameterECG Challengearrhythmia
Price$5.99Free — better
Rating5.0 (1 ratings) — better4.1 (113 ratings)
Positive reviews100.0% of reviews — better43.9% of reviews
Number of ratings1113 — better
Update frequencyEvery 11 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
Best chart rank#43 — better—
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS17.617.6
Further details — not scored
Size51 MB159 MB
Age rating17+17+
DeveloperLimmer CreativeSingle Sail Software, LLC

Customer experience

ECG Challenge

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

arrhythmia

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

Bugs and requests

ECG Challenge

Not enough reviews yet to summarise bugs or requests.

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

ECG Challenge

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 ECG Challenge free?
ECG Challenge costs $5.99, with no in-app purchases.
Is arrhythmia free?
arrhythmia is free to download, with in-app purchases available.
Which has better reviews, ECG Challenge or arrhythmia?
ECG Challenge is rated higher. ECG Challenge averages 5.0 out of 5 from 1 ratings, while arrhythmia averages 4.1 from 113 ratings.
Do ECG Challenge or arrhythmia have ads?
Neither ECG Challenge nor arrhythmia shows ads.
Which is updated more often, ECG Challenge or arrhythmia?
ECG Challenge ships an update every 11 months, and arrhythmia every 3 weeks. Most recently, ECG Challenge was updated on October 22, 2026 and arrhythmia on October 21, 2026.

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