Intunator vs JustATuner

Intunator is an intonation-training app that recognizes a played note and plays back a corrected version for musicians to match by ear. It is designed for wind, string, and plucked-instrument players, as well as vocalists, and detects pitches across nearly seven octaves. Its display can show note names or solfege and graphically indicate pitch deviation. Settings include 56 instrument choices, transposition, concert pitch, background noise, note spelling, and pitch-detection options. Drone Mode provides a sustained chosen note for practice in equal or just temperament. Corrected notes can play through headphones or speakers, with fifth or octave offsets and three output sounds; turning off the control tone allows tuner use. Intunator is available for iOS and Android. The iOS INTUNATOR STARTUP version has a four-week free test, and TUNER PRO without the control tone has a two-week free test. Android renting and free testing are still in planning. Listed plans range from €2.99 a month for Tuner Pro to €49.99, paid once for Intonation Trainer Lifetime.

JustATuner is a free, open-source desktop tuner for musicians, combining a stroboscopic tuner with a just-intonation drone. Its chromatic tuner has 12 wheels for the pitch classes, each with seven concentric rings. Users can set reference pitch and instrument transposition, and adjust cents bias for each wheel and octave bias for each ring. The drone plays root, root-plus-fifth, major-triad, or minor-triad voicings in a pure sine or harmonic-stack sound. A live meter reports the just-intonation interval and cents difference, marking LOCKED within 5¢ of just intonation. A Lissajous display shows interference between the played note and drone, with adjustable color, trace thickness, trail count, and resolution. The app detects pitch through a microphone; its maker recommends a quality microphone and strongly recommends headphones while the drone is on. It is available for Windows, Linux, and macOS on Apple Silicon M1, M2, M3, and M4. Linux requires PortAudio, and the downloaded binary may need executable permission. The maker says the app is unsigned, so an operating-system warning may appear.