HBrO3 Or HBrO? which acid is stronger

I'm pretty sure HBrO3 would be stronger, because it has one more oxygen (a very electronegative element). In the same sense, HBrO4 would be stronger than HBrO3 and HBrO2 would be stronger than HBrO

The BrO2 - ion has one more oxygen (a very electronegative element) than does BrO-, hence BrO2 - is more electronegative. This weakens the H-O bond which makes it easier for the H to come off as H + (i. e. act as an acid). HBrO2 is shown below.

O=Br-O-H

By the same argument, HBrO4 is a stronger acid than HBrO3 which is a stronger acid than HBrO2.