APTuner is built around a best-in-class note detector spanning 8 octaves even for low piano notes.

Our analysis algorithm eliminates many of the octave or fifth errors you often see with other tuners.
Every audio sample is fed through the GPU to calculate the real stroboscopic effect--exactly like a mechanical spinning disk. Looks absolutely amazing in landscape on a retina display! (currently only for iPhone)
Performance Analyzer

For the aspiring musicians in the group, you will love APTuner's exclusive Performance Analyzer feature. Get an in-depth analysis of your playing ability over time. This is perfect for ear-training, scales, and getting a better awareness of your tonal quality.

You can also watch the loudness of each note against its pitch. This way you are not only improving the consistency of your tone, but your volume as well. (currently only for iPhone)
Temperaments & Transpositions