# O2 Duration vs BloodCOMM

The clearest difference is price: BloodCOMM at Free against O2 Duration's $2.99. BloodCOMM also leads on rating (5.0 vs 1.0) and update cadence (every 2 weeks vs every 15 months). O2 Duration's advantage is iOS requirement (7.0 vs 15.6). On ratings volume, ads, in-app purchases and device support there is nothing between them.

BloodCOMM is free to download; O2 Duration costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BloodCOMM holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

O2 Duration ships an update every 15 months, BloodCOMM every 2 weeks. Both last shipped on October 15, 2026.

## The numbers

| Metric | O2 Duration | BloodCOMM |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/o2-duration/id556420187/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bloodcomm/id6467690971/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 weeks** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 98 MB |
| Requires iOS | **7.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Advanced Aviation LLC](https://appshunter.io/developer/540245667) | [Delta Development Team, Inc.](https://appshunter.io/developer/1689268727) |

## What reviewers say

### O2 Duration

[App page](https://appshunter.io/ios/app/o2-duration/id556420187)

Calculate the approximate remaining oxygen in portable cylinders. Select your tank size, input current pressure and desired flow rate to see duration in minutes. Features a timer with alerts for low pressure.

**Highlights:** Oxygen cylinder duration calculation, Supports multiple cylinder sizes (A, B, D, E, G, H, K, M), Input current tank pressure, Input desired flow rate, Displays duration in minutes, Running timer with remaining time, Low pressure alerts (500lbs and 0lbs)

**Features:** macOS Compatibility

**In-app purchases:** none


### BloodCOMM

[App page](https://appshunter.io/ios/app/bloodcomm/id6467690971)

This application allows users to wirelessly monitor and manage the temperature of blood products stored in compatible portable medical refrigerators and smart blood coolers. It provides real-time data, historical records, and alerts for temperature excursions, ensuring compliance and product integrity.

**Highlights:** Real-time temperature monitoring, Bluetooth and cellular monitoring, Temperature history and graphs, Excursion alerts and recording, Downloadable PDF/CSV reports, Unit nickname assignment, Low battery notifications

**In-app purchases:** none


## Frequently asked questions

### Is O2 Duration free?

O2 Duration costs $2.99, with no in-app purchases.

### Is BloodCOMM free?

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

### Which has better reviews, O2 Duration or BloodCOMM?

BloodCOMM is rated higher. O2 Duration averages 1.0 out of 5 from 1 ratings, while BloodCOMM averages 5.0 from 1 ratings.

### Do O2 Duration or BloodCOMM have ads?

Neither O2 Duration nor BloodCOMM shows ads.

### Which is updated more often, O2 Duration or BloodCOMM?

O2 Duration ships an update every 15 months, and BloodCOMM every 2 weeks. Most recently, O2 Duration was updated on October 15, 2026 and BloodCOMM on October 15, 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.*