Grainote - Guitar Tuner

GRAINOTE is a tuner and acoustic data tracker for guitarists.

Every time you tune, GRAINOTE automatically records the acoustic characteristics of your strings, building a unique "acoustic fingerprint" of your guitar over time.

【Key Features】

■ Precision Chromatic Tuner
Detects the fundamental frequency of each string in real time, supporting precise tuning down to the cent.

■ Acoustic Profile Recording
Each tuning session automatically saves:
· Fundamental strength (dB)
· 2nd–5th harmonic ratios
· Spectral centroid (brightness)
· Sustain score

■ Harmonic Spectrum Display
Play a string to see its frequency spectrum in real time — visualize the harmonic structure of your guitar's tone.

■ Tuning History
Browse past session data and track how your strings' acoustic properties change over time.

■ Model Comparison (Coming Soon)
No two guitars sound alike, even the same brand and model. Compare your data anonymously with other players and discover the individual variation and resonance that make your guitar unique.

■ Multi-Guitar Management
Register and manage multiple guitars with details like brand, model, and string gauge.

【Privacy】
Only acoustic numerical data is collected (harmonic ratios, frequency values, sustain scores, etc.). Audio is never recorded or stored. All data is processed anonymously.

A4 reference pitch is adjustable from 432 Hz to 446 Hz. Microphone access is required.