The accompanying mobile app comes preset with 8 alternate and open tunings. It also gives you the ability create your own custom tunings. If you like to tune a string slightly sharp or flat or if you have a piece you like to play in a different temperament, simply adjust that tuning in the app. The reference A 440 Hz pitch is customizable in 0.1 Hz increments from 420 Hz to 460 Hz.
Tuning with Roadie is three times more accurate than the average human ear. Even in noisy environments, switch on noise cancellation and let Roadie deliver its perfect, crisp tuning. Detection range: A1 (55 Hz) - A5 (880 Hz). Listening accuracy: ±0.1 Hz. Tuning accuracy: ±2 cents.