# arrhythmia vs Respi

The clearest difference is review sentiment: Respi at 88% against arrhythmia's 45%. Respi also leads on monetization model (free vs subscription) and rating (4.7 vs 4.2). arrhythmia's advantage is chart position (#188 vs unranked). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. arrhythmia sells 3 in-app purchases, starting at $2.99 per month and Respi sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Respi holds the better App Store score, 4.7 against 4.2. Both are backed by a comparable volume of ratings — 111 and 118 respectively. Written reviews point the same way: 45% of arrhythmia's written reviews are positive against 88% of Respi's.

arrhythmia ships an update every 3 weeks, Respi weekly. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | arrhythmia | Respi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (111 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews) | **[4.7 (118 ratings)](https://appshunter.io/ios/app/respi-rate/id1508183194/reviews)** |
| Number of ratings | 111 | **118** |
| Positive reviews | 45.0% of reviews | **87.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Subscription | **Free** |
| Best chart rank | **#188** | — |
| Size | 159 MB | 29 MB |
| Requires iOS | 17.6 | **16.6** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) | [medappear s.r.o.](https://appshunter.io/developer/1508183193) |

## What reviewers say

### arrhythmia

[App page](https://appshunter.io/ios/app/arrhythmia/id996560473)

**Currently charting:** #188 Top Grossing · Medical (US App Store)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $19.99 | per year |
| Unlock All Rhythms (One-time Purchase) | $4.99 | one-time |


### Respi

[App page](https://appshunter.io/ios/app/respi-rate/id1508183194)

This app assists healthcare professionals in accurately measuring a patient's respiratory rate. It uses an innovative algorithm and a simple button press to calculate breaths per minute, accounting for user reaction time for precise results. Designed for regular breathing patterns, it ensures accuracy within 95% ± 1 breath/min.

**Highlights:** Accurate respiratory rate calculation, Innovative algorithm, Simple one-button interface, Accounts for user reaction time, Ensures 95% ± 1 breath/min accuracy, Designed for regular breathing patterns

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-Day Free Pro Trial | Free | one-time |
| Lifetime Pro — Intro Offer | $9.99 | one-time |
| Lifetime Pro | $12.99 | one-time |


## Frequently asked questions

### Is arrhythmia free?

arrhythmia is free to download, with in-app purchases available.

### Is Respi free?

Respi is free to download, with in-app purchases available.

### Which has better reviews, arrhythmia or Respi?

Respi is rated higher. arrhythmia averages 4.2 out of 5 from 111 ratings, while Respi averages 4.7 from 118 ratings.

### Do arrhythmia or Respi have ads?

Neither arrhythmia nor Respi shows ads.

### Which is updated more often, arrhythmia or Respi?

arrhythmia ships an update every 3 weeks, and Respi weekly. Most recently, arrhythmia was updated on September 21, 2026 and Respi on September 22, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*