PureTone: Frequency Generator

A tone generator without ads, before or after you buy anything. [The exact frequency you want] • 1 Hz to 22,000 Hz • Log-scale slider, so low frequencies are easy to hit • Type a number, or nudge by ±1 / ±10 / ±100 Hz (hold to repeat) • Tap a recent frequency to go straight back to it [Clean sound] • Sine, square, triangle and sawtooth • All four are band limited, so nothing sounds that you did not ask for • Change frequency, waveform, volume or balance while playing, without clicks • Watch the waveform of whatever is sounding [Notes] • Press a one-octave keyboard and hear the note • Octave and semitone steps, C0 to B8 • A4 reference 415-466 Hz — for an orchestra at 442 Hz, or baroque pitch at 415 Hz • Solfege or letter names [And] • Balance, with left / center / right in one tap • Keeps playing with the screen off; stop it without opening the app • Every tab remembers its settings, so…