O2 Duration vs Unit Converter For Medics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O2 Duration
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.
- 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)
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O2 Duration is an oxygen consumption calculator for various oxygen cylinder sizes. This is the easiest way to quickly determine the approximate number of minutes until an oxygen tank will be depleted of oxygen. This tool is a must have for Nurse's and EMT’s who work with portable oxygen cylinders. The application allows you to select cylinder tank sizes A, B, D E, G, H, K and M. With the current tank pressure and desired flow rate, the app will display the oxygen duration in minutes. Additionally, a timer can be started which will display a running tank pressure and time in minutes remaining until the tank is empty. When tank pressure reaches 500lbs or when the tank pressure is zero the application will alert you. This is not a substitute for looking at the oxygen cylinder gauge to determine actual pressure and should not be relied on as a means to determine oxygen remaining.
Unit Converter For Medics
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Conversion units from imperial to metric and vice versa is always a nuisance. Juggling multiple sources to do easy and repetitive tasks on daily basis is a torture. This App solves this problem. It converts 4 basic and essential values that we come across surprisingly often. Weight - kg / st / lb Height - cm / ft / in Temperature - °C / °K / °F Blood Glucose - mmol/L / mg/dL Quick and easy, does what it says on the tin. Just enter the value you wish to convert.
Screenshots
Verdict
The clearest difference is price: Unit Converter For Medics at Free against O2 Duration's $2.99. Unit Converter For Medics also leads on update cadence (every 7 months vs every 15 months). O2 Duration's advantage is iOS requirement (7.0 vs 12.1). On ads, in-app purchases 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
Unit Converter For Medics is free to download; O2 Duration costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
O2 Duration ships an update every 15 months, Unit Converter For Medics every 7 months. The most recent releases landed on October 15, 2026 and October 25, 2026 respectively.
| Parameter | O2 Duration | Unit Converter For Medics |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 15 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 7.0 — better | 12.1 |
| Further details — not scored | ||
| Size | 1 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Advanced Aviation LLC | Krzysztof Gwiazda |
In-app purchases
O2 Duration
No in-app purchases
Unit Converter For Medics
No in-app purchases
Questions
Is O2 Duration free?
Is Unit Converter For Medics free?
Do O2 Duration or Unit Converter For Medics have ads?
Which is updated more often, O2 Duration or Unit Converter For Medics?
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