Tune fast. Stay accurate. Keep playing.
JustAGuitarTuner gives you a clean, distraction-free tuner that works on desktop and mobile with real-time pitch detection, alternate tunings, and a layout that feels more like a polished app than a throwaway tool.
The tuner
Designed to feel like a real product, not a filler page.
Made for real practice sessions
Fast load times, strong contrast, and a clear meter make this easy to use during lessons, rehearsals, or quick retunes between songs.
Useful on mobile too
Set your phone near the guitar body, grant microphone permission, and tune without installing an app.
Alternate tunings built in
Switch between standard, Drop D, half-step down, Open G, Open D, and DADGAD without leaving the page.
Free online guitar tuner
This tuner uses your device microphone and the Web Audio API to analyze pitch in real time. When you play a note, the page estimates the fundamental frequency, matches it to the nearest musical pitch, and shows whether you are sharp, flat, or centered.
How to use it
- Press Start Tuning and allow microphone access.
- Choose the tuning preset that matches your guitar setup.
- Play one string at a time and watch the meter move toward center.
- Stop when the needle centers and the note matches your target.
Standard tuning reference
For standard guitar tuning, the strings from low to high are E2, A2, D3, G3, B3, and E4. Drop D changes the low E to D. Half-step down lowers every string by one semitone. Open tunings change the overall chordal relationship and are popular for slide, blues, and folk styles.
Also included: online metronome
Pair accurate tuning with a clean practice clock. The metronome includes tap tempo, time signatures, and adjustable BPM from 20 to 300.
Launch metronomeWhy this site exists
JustAGuitarTuner is built to be simple, fast, and useful. No login wall, no app-store detour, and no clutter between you and the tool you came for.
For broader learning resources, visit our sister site JustMusicTheory.com.
Recommended gear
A small, restrained set of relevant products.
As an Amazon Associate, this site may earn from qualifying purchases. That support helps keep the tools free.