PianoMeter

PianoMeter transforms your Android or iOS device into a professional-grade piano tuning tool. Unlike standard chromatic tuners that use a generic temperament, this app actively measures the tonal characteristics of each note to automatically calculate the ideal “stretch” for your specific piano. It creates a custom tuning by finding the best compromise between intervals like fifths, fourths, and octaves, much like an experienced aural tuner.

The app offers functionality for all levels:

• Free Version: Evaluate a piano's tuning and sample the app's features.
• Plus Version: Unlock full tuning for the entire piano, access historical temperaments, and tune to standards other than A=440.
• Pro Version: Designed for professional tuners, this version adds features like saving/loading tuning files, pitch raise calculations, and the ability to customize tuning curves.

PianoMeter stands out by automatically calculating the optimal stretch and analyzing multiple intervals and partials simultaneously for a more accurate and stable tuning.