
Adrien
This is a great app. Simple and unobtrusive, with no ads! It's had its crashing problem fixed and doesn't deserve the 1 star ratings anymore. It'd be nice to enable/disable listed tanks to only see tanks available to you, or even add new tank sizes. The oxygen tanks I frequently use aren't listed (Hospital/Ambulance M Tank 3511L with a 1.56 constant). However, you can plug in whatever values you need. The app has a really clean and simple interface with a gauge and timer that counts down.

Michelle Dayton
Been using this app for a few months now. It allows you to accurately calculate how much time your oxygen tank has. The timer function does not run in the background. Once you set it and proceed to do something else on your phone it stops. I put the timer amount on my phone timer and use that alarm instead. I do like that you can change the figures on the timer to see how much air you have left. If you are using a tank that is less than full, you can adjust the psi to get an accurate reading.
Some Jokers Software
September 12, 2025
With the latest version 1.1.15, the timer should run while the app is running in the background. But if you close the app the notification will not occur.

Brittany Rawlinson
Like others have said, the app will accurately calculate oxygen in the tank, especially if starting with a different PSO level, but as soon as you click away from the app, the timer stops running.
Some Jokers Software
August 31, 2026
I'm wondering if that might be due to not allowing the app to run in the background. Thank you for letting us know