1 year
I was frustrated when I first downloaded it because the age font is small enough that I couldn’t get it to adjust. I worked that out after a few tries.
My first few readings were high, these were taken without exercising, but when I took it during or immediately after a workout I found that it gave me a relatively close, although a bit low, reading.
It has to be tight on my wrist to work properly. I now take 4-5 readings throughout the day with at least two during my workouts, then I average the results.
For a free app I thinks it’s a great tool when used properly. Don’t expect to get a highly accurate reading from it, the technology just isn’t there yet, however using this beats paying thousands of dollars a year and cumbersome equipment to get a daily vo2 max reading.
Response from developer
Thanks for your review. The VO2MAxX you getting is a rough estimate, calibrate statically against the averg population. A true Vo2Max can only be measured in lab, where you wear a oxygen mask that measures your O2 intake while doing an exercise (like running, cycling) that would exhaust the O2 in the blood.