arrhythmia vs Muru
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- EKG interpretation practice
- Lead II simulation
- Study Mode with rhythm selection
- Game Mode for random rhythm identification
- Customizable rhythm sets
- Realistic rhythm variations
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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
Muru
This app provides essential tools for medical professionals during emergencies. It offers quick access to protocols, medication dosages, and transport decisions. Users can also find detailed information on equipment and medications, with all data sourced from authorized medical professionals.
- Protocol Finder
- Dosing Information
- Medication Math Calculator
- Transportation Decision Support
- Equipment & Medication Details
- Source Verification
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Built by medics, for medics, Muru delivers you the right tools you need during a call. Intuitive, blazingly fast, and built for the mission-critical work you do. Protocol Finder ------------------------------- Find the right protocol without having to memorize the name. Just type in any medical condition and Muru will locate the correct protocol in your protocol set. Dosing ------------------------------- Get any information you need on a dose. Find out how many times you can repeat your dose, if it’s a medical control order, or its contraindications. Med Math ------------------------------- All your med math done for you with every variable accounted for. Infusion sets, concentrations, weight, 200 mg in 250 ml – it’s all taken care of. Transportation Decisions -------------------------------------------------- No second-guessing transport decisions or arguments about if a hospital recently lost its STEMI certification. Know where the closest specialty hospital is and how much farther it is than your closest hospital. Equipment & Meds ------------------------------- Dive into everything you carry on your ambulance. Know why the auto compressor is beeping twice, if you have to double or single tread your tourniquet, or everywhere ketamine is used in your protocols. Your Sources ------------------------------- All the information in Muru is from a source you are authorized to follow. Your medical director, your DOH, your officer, your manufacturer’s recommendations. You can see the source of any result with a single tap. If you have any issues when using the app, you can hit the 'Get support' button in the menu to get in touch with a member of the Muru team or email us at support@murumed.com.
Screenshots
Verdict
The clearest difference is review sentiment: Muru at 96% against arrhythmia's 44%. Muru also leads on rating (4.8 vs 4.1) and in-app purchases (none vs 3). arrhythmia's advantage is ads (none vs shown). On price, ratings volume, update cadence 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
Both are free to download. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. Muru asks for nothing beyond the download.
Muru holds the better App Store score, 4.8 against 4.1. Both are backed by a comparable volume of ratings — 113 and 132 respectively. Written reviews point the same way: 44% of arrhythmia's written reviews are positive against 96% of Muru's.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | arrhythmia | Muru |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (113 ratings) | 4.8 (132 ratings) — better |
| Positive reviews | 43.9% of reviews | 96.1% of reviews — better |
| Number of ratings | 113 | 132 — better |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | Free with in-app purchases — better |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 159 MB | 61 MB |
| Age rating | 17+ | 17+ |
| Developer | Single Sail Software, LLC | Muru, Inc. |
Customer experience
arrhythmia
Muru
User reviews
arrhythmia
From 113 App Store ratingsWhat 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
Muru
From 132 App Store ratingsWhat we love
- 👍 Easy to use and navigate
- 🚀 Quick access to information
- 💡 Comprehensive protocol information
- 💡 Accurate medication dosages
- 💡 Location sharing for hospitals
Room to improve
- 🐛 Tiny print on cell phone
- 🐛 App freezes sometimes
- 🐛 Needs work on text wrapping when zoomed
Bugs and 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
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- 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
Muru
Reported bugs
4 issues- Protocol pages display as full page with tiny print
- Text does not wrap when zoomed on protocol pages
- App freezes at times
- App goes to a 'cyber timeout room'
Requested features
2 requests- Better AI assistant for broader queries
- Integrate Siri
In-app purchases
arrhythmia
- Monthly7 Days trial$2.991 Month
- Yearly7 Days trial$19.991 Year
- Unlock All Rhythms (One-time Purchase)$4.99
Muru
No in-app purchases









