Most vocal tuners only check pitch. This one checks whether your voice is balanced — breath support and an open mouth — or whether your throat is doing the work instead (why singers squeeze and go flat on high notes). Set a baseline with your own easy "ah", then sing: when all five signals stay inside your baseline window the sound crosses the balance line; when one drops, a throat-tension gauge rises. No scores. Phone browser, no app, no sign-up, audio never leaves the device.