# Cyl Duration vs Rapid Vent Calculator

The clearest difference is review sentiment: Rapid Vent Calculator at 100% against Cyl Duration's 42%. Rapid Vent Calculator also leads on update cadence (every 4 months vs every 49 months) and rating (5.0 vs 4.6). Cyl Duration's advantage is iOS requirement (10.0 vs 13.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Rapid Vent Calculator holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 11 and 47 respectively. Written reviews point the same way: 42% of Cyl Duration's written reviews are positive against 100% of Rapid Vent Calculator's.

Cyl Duration ships an update every 49 months, Rapid Vent Calculator every 4 months. The most recent releases landed on October 23, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Cyl Duration | Rapid Vent Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (11 ratings)](https://appshunter.io/ios/app/cyl-duration/id447311122/reviews) | **[5.0 (47 ratings)](https://appshunter.io/ios/app/rapid-vent-calculator/id6451494244/reviews)** |
| Number of ratings | 11 | **47** |
| Positive reviews | 41.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 49 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 17 MB | 48 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Responsive Respiratory, Inc.](https://appshunter.io/developer/447311125) | [JENCO LLC](https://appshunter.io/developer/1698545004) |

## What reviewers say

### Cyl Duration

[App page](https://appshunter.io/ios/app/cyl-duration/id447311122)

Calculates remaining oxygen in a cylinder for ambulatory users. Input device, liter flow, and cylinder size for precise remaining hours and minutes. Provides peace of mind for oxygen users on the go.

**Highlights:** Calculate remaining oxygen hours/minutes, Input device settings, Input liter flow, Input cylinder size, Precise readout

**Features:** macOS Compatibility

**In-app purchases:** none


### Rapid Vent Calculator

[App page](https://appshunter.io/ios/app/rapid-vent-calculator/id6451494244)

This medical app assists healthcare professionals in calculating essential ventilator settings and medication dosages for critical care. It provides rapid, accurate results for paramedics, respiratory therapists, nurses, and doctors, streamlining patient management.

**Highlights:** Effortless ventilator settings calculation, Rapid results for quick decision-making, RSI medication dosage assistant, User-friendly interface for medical professionals, Accurate patient parameter input

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

**In-app purchases:** none


## Frequently asked questions

### Is Cyl Duration free?

Cyl Duration is free to download, with no in-app purchases.

### Is Rapid Vent Calculator free?

Rapid Vent Calculator is free to download, with no in-app purchases.

### Which has better reviews, Cyl Duration or Rapid Vent Calculator?

Rapid Vent Calculator is rated higher. Cyl Duration averages 4.6 out of 5 from 11 ratings, while Rapid Vent Calculator averages 5.0 from 47 ratings.

### Do Cyl Duration or Rapid Vent Calculator have ads?

Neither Cyl Duration nor Rapid Vent Calculator shows ads.

### Which is updated more often, Cyl Duration or Rapid Vent Calculator?

Cyl Duration ships an update every 49 months, and Rapid Vent Calculator every 4 months. Most recently, Cyl Duration was updated on October 23, 2026 and Rapid Vent Calculator on October 7, 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.*