Studio51 Song Analysis is an iOS app that analyzes your own mixes entirely on the iPhone. Import wav, m4a or mp3 and it reports tempo, key, LUFS loudness and brightness, plus percentiles against a features-only year-end index so you can see where your mix sits. Genre chips keep a rock mix from being compared to pop or rap. The audio never leaves the device: no uploads, no accounts. One-time $9.99 purchase, no subscription.
