Comparison

arrhythmia vs Certa Dose

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
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

About

Certa Dose

This app helps healthcare professionals confidently administer high-risk medications. It provides visual verification for each step, estimates weight-based doses, and documents sessions instantly. Designed to reduce critical dosing errors, it offers peace of mind in high-stress medical environments.

Highlights
  • Visual medication administration verification
  • Weight-based dose estimation
  • Syringe volume visualization
  • Instant session documentation
  • Medication information and contraindications
  • Virtual pediatric measuring tape
Read full description

Ease the stress and get your confidence back when administering high-risk medication with the Certa Dose App! We provide visual verifies each step of the way to secure the right outcome. Explore the features during the 14-day free trial period and add peace of mind to your daily practice. The Certa Dose app allows you to go through the process of medication administration in less than 60 seconds with a visual representation of everything that you do. You will be able to estimate weight-based dose using multiple options, choose the right syringe, visualize the correct volume of the medication concentration and document sessions seamlessly. HCPs working in emergency care are under a lot of stress—it can be easy to lose track of the various steps of proper measurement of medicine, get distracted, misplace a decimal point, and make a mistake while the patient is in a critical state and the healthcare provider is under stress—mistakes happen and these situations are one of the leading causes of critical dosing errors. That is why we believe visualization features can help medical professionals double-check their work and make sure they clearly see the amount of medicine they intend to administer. The mission of the Certa Dose app is to empower medical professionals to be aware and mindful while measuring medication so they can avoid medical dosing errors. What features do we offer our subscribers? Developed by healthcare professionals using cutting edge technology, the Certa Dose app is trustworthy and fast. We offer: - Multiple options to estimate the patient’s weight - Virtual pediatric measuring tape to assist in obtaining the length of the patient - Select from a dropdown reference of the common medication ranges appropriate for the patient's weight - Visual guide assists in the measurement of volumes by seeing an image of the selected volume - Latest medication information from the pharmaceutical manufacturers including disclaimers and contraindications - Correct medication volume shown in a syringe, visualized in-app - Instant session documentation with timestamps ready for sharing or sending as PDF How does it work? - Medical professionals can select the desired patient measurement from a menu of options - Desired medications are conveniently organized according to the medical situation the medical professional desires to address (E.g. Allergies, etc) - A drop-down reference conveniently lists appropriate dose ranges and administration information - Medical professionals are able to select the route, dose and concentration they desire to give from the reference - Once the desired information is selected the app will provide an image of the most appropriate syringe for the desired volume selected - You can visually validate the selected volume, with easy access to administration reference material and instructions - Compare physical syringe volume with the one in the application to confirm the correct dose - The app keeps track of selected medications automatically timestamps all the steps you did and you can instantly share with ease What medical situations do we cover? Provides reference material for the most common emergencies including: 1. Analgesia 2. Anaphylaxis/Allergy 3. Cardiovascular: Cardiac Arrest 4. Cardiovascular: SVT 5. Cardiovascular: Wide-QRS Tachycardia 6. Cardiovascular: Bradycardia 7. Rapid Sequence Intubation: Pre-treatment 8. Rapid Sequence Intubation: Induction 9. Rapid Sequence Intubation: Paralytic 10. Sedation 11. Seizure 12. Asthma/Croup 13. Fluid Bolus/ hypotension Our subscribers will receive regular free updates with more medical situations, more medication options and a number of new features! https://www.certadose.com/terms-of-service-app

Screenshots

arrhythmia4 screens
Certa Dose4 screens

Verdict

The call

The clearest difference is review sentiment: Certa Dose at 100% against arrhythmia's 44%. Certa Dose also leads on rating (5.0 vs 4.2) and iOS requirement (13.0 vs 17.6). arrhythmia's advantage is update cadence (every 3 weeks vs every 3 months) and ratings volume (111 vs 5). On price, ads, in-app purchases and monetization model 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. arrhythmia sells 3 in-app purchases, starting at $2.99 per month and Certa Dose sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Certa Dose 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 5, so its average is the more settled of the two. Written reviews point the same way: 44% of arrhythmia's written reviews are positive against 100% of Certa Dose's.

UpkeepUpdate frequency

arrhythmia ships an update every 3 weeks, Certa Dose every 3 months. The most recent releases landed on October 13, 2026 and October 10, 2026 respectively.

Scorecard5 real differences · 5 level
arrhythmia versus Certa Dose: the parameters behind the verdict, then further details
ParameterarrhythmiaCerta Dose
PriceFreeFree
Rating4.2 (111 ratings)5.0 (5 ratings) — better
Positive reviews43.9% of reviews100.0% of reviews — better
Number of ratings111 — better5
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionSubscription
DevicesiPhone, iPad, Mac — betteriPhone, iPod
Requires iOS17.613.0 — better
Further details — not scored
Size159 MB16 MB
Age rating17+17+
DeveloperSingle Sail Software, LLCCerta Dose, Inc.

Customer experience

arrhythmia

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

Certa Dose

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
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
2 purchases

Certa Dose

Subscriptions2
  • Monthly plan14 Days trial$3.991 Month
  • Yearly subscription14 Days trial$29.991 Year

Questions

Is arrhythmia free?
arrhythmia is free to download, with in-app purchases available.
Is Certa Dose free?
Certa Dose is free to download, with in-app purchases available.
Which has better reviews, arrhythmia or Certa Dose?
Certa Dose is rated higher. arrhythmia averages 4.2 out of 5 from 111 ratings, while Certa Dose averages 5.0 from 5 ratings.
Do arrhythmia or Certa Dose have ads?
Neither arrhythmia nor Certa Dose shows ads.
Which is updated more often, arrhythmia or Certa Dose?
arrhythmia ships an update every 3 weeks, and Certa Dose every 3 months. Most recently, arrhythmia was updated on October 13, 2026 and Certa Dose on October 10, 2026.

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