A440 Tuner is a simple app that gives a musician a reference Concert A (440MHz) pitch in any combination of 3 different forms: as played by a real oboe, as played by a synthesizer modeled oboe, or as a sine wave.
This app is not a meter or strobe or chromatic tuner - it simply produces the Concert A reference pitch.
While this may seem limited from the viewpoint of one who needs to tune by meter, it fits the needs precisely for a concert musician who is trained to tune their instrument from a Concert A.
The oboe was chosen for this app because in an orchestra setting it is typically the oboe that gives the reference pitch at the beginning of rehearsals and concerts.
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