Free, accurate chromatic tuner for guitar, bass, ukulele, and banjo. Tune quickly with a responsive cents display and support for standard, drop, open, and alternate tunings. Unlock Octave Pro once for custom tunings, strobe mode, metronome, profiles, and setup tools—no subscription. PRECISION YOU CAN HEAR Octave Tuner identifies your note and exact frequency in real time. No lag. No drift. Just accurate tuning, every time. BUILT FOR MULTIPLE INSTRUMENTS Create and save custom profiles for each of your guitars, basses, or ukuleles. Switch between instruments in seconds—no reconfiguring, no guesswork. Whether you play a vintage acoustic, an electric with Drop D, or a short-scale bass, your settings are ready. INTONATION GUIDE Go beyond open-string tuning. Octave Tuner's intonation guide helps you dial in pitch accuracy across the fretboard. BUILT-IN METRONOME Practice in time with a clean, distraction-free metronome. SUPPORTS GUITAR, BASS & UKULELE Optimized tuning profiles for standard and alternate tunings across guitar, bass guitar, and ukulele.