May as well use a cheap microphone or SPL meter to get a general idea in white noise, no? While the readings will not be very accurate, peaks and troughs usually still are apparent. Just for the rough measurement aids.
I just use the stock iphone headset, shove the mic on one of my ears, mic side facing outwards, and put headphones on. You can expect the results to not be very accurate but a good general idea of the major flaws can be found. Since I don't have sinegen, I verify those peaks and troughs with tones generated on audacity and mostly are correct. If there's any smaller inline mic with decent quality, even better.
My problem with frequency sweep and pink noise is that I can hear the peaks but I don't know what frequency that is lol. I've yet to be trained in such hearing interpretation.