Tune by ear with reference tones, or use your microphone for automatic pitch detection.
Tap a string to hear its pitch
Tap a string above to hear it
Auto pitch detection
Tap Start to detect pitch
Guitar Tool Hub's free online guitar tuner works in two modes. The ear tuner plays a precise reference tone for each string so you can tune by listening — no microphone needed. The microphone tuner uses your device's mic to detect the pitch you're playing in real time, shows the closest string match, and displays cents deviation with a visual needle so you can see exactly how sharp or flat you are. Supports standard tuning plus 6 alternate tunings: Drop D, Open G, Open D, DADGAD, Drop C, and Open E.