Is anybody aware of an app that will show vowel formants in real time (or more or less)? I know there are apps that will give you a spectrogram, but I can't read the output quickly or accurately enough. I've also now seen this previous question and one of the apps mentioned in the answer does do something similar (it plots vowels on a vowel quadrilateral) but the developers say that getting it to identify formants is "very much a work in progress".
Praat can do the exact job.
Dotted red lines represent formants, but they are not in real time.
Here is the link if you want to download it: http://www.fon.hum.uva.nl/praat/