Is this song tuned to 432 Hz?
Drop the file on the device. It measures the pitch the recording actually sits at and tells you whether that is 432, 440 or something else. Nothing is uploaded.
Reading the result
A song tuned to A = 432 Hz sits 31.8 cents, about a third of a semitone, below standard 440 Hz tuning. The checker finds where the notes in the recording sit against the 440 grid and turns that into the frequency of A4. Anything within five cents of 432 counts as 432; within a cent of 440 counts as standard pitch.
The tuning panel shows the same thing two ways. The meter needle points at the distance from 440 in cents, and the strobe row that stands still while the track plays names the pitch: the top row is 432, the middle 440, the bottom 448.
A reading of 437 or 443 is not 432. Older records drift a few hertz because tape machines and cutting lathes ran at slightly different speeds, and some orchestras tune a little high. Why the difference is smaller than the claims around it suggest is covered in 432 Hz vs 440 Hz, and why old records wander in why old records sound out of tune.
Also on the display
The same measurement gives you the key and tempo. For the full analyser, with nothing about 432 in the way, go to the key and BPM finder.