Howling Tuner is a precise, easy tuner for violin, cello, guitar and ukulele, with a live pitch-over-time plot and a built-in metronome.

TUNE FAST
• Pick your instrument and it detects which string you're playing automatically.
• Tap a string to tune just that one: great for low cello and guitar strings.
• A clear needle shows how many cents sharp or flat you are, and turns green when you're in tune.
• A check mark appears on each string once it has held in tune.
• Long-press any string to hear its reference note.

ALTERNATE TUNINGS
• Guitar: Standard, Drop D, half step down, full step down, Drop C, DADGAD, Open G, Open D.
• Ukulele: Standard (high G), low G, D tuning, baritone.
• Adjustable reference pitch from A4 = 415 to 466 Hz.

SEE YOUR PITCH
• A scrolling piano-roll plot shows your pitch over time, with your strings marked.
• Pinch to zoom, go full screen, or drag back through the last 10 minutes.
• Great for checking intonation while practicing scales.

STEADY READINGS
• Adjustable smoothing (off, low, medium, high).
• Ignores octave jumps, the sharp pluck attack and noisy fading notes. Every option can be switched on or off.

METRONOME
• Start and stop it right from the plot, and drag to change the tempo.
• 30 to 250 BPM, tap tempo, and an accented first beat.
• Beat ticks on the plot show each click against your pitch.
• Turn the click sound, flash and ticks on or off.

Howling Tuner works on your phone's built-in microphone. Audio is analyzed on your device and is never recorded. The app is free with a small banner ad, which you can remove with a one-time purchase.