Available now on Android
Alternate tuning guide
Open G tuner guide for guitar
Open G turns the guitar into an instant chord machine: strum across it and you already have a G chord. The tradeoff is that the tuning repeats both D and G, so a noisy room or a full strum can blur the target names together. Centerline's public Android release can still get you there, but Open G works best when you tune the repeated strings in a calm, deliberate order instead of chasing the whole neck at once.
Free standard tuningUS $3.99 one-time unlock
String order
Stack the Ds first, then settle the G pair.
Open G keeps three D strings alive across the neck, which is why slide players love it. Tune the sixth string down to D, bring the fifth up or down to G as needed, then place the fourth back on D before you touch the third and first strings. That sequencing gives your ear a stable low framework. The current public build can identify the closest guitar target quickly, but repeated-note tunings always get cleaner when the guitar is asked one question at a time.
Once the low half is steady, tune the third string to G, the second to B, and the first to D. The top D often reveals itself last, especially on lighter strings. If the note is already close but not staying centered, Strobe is the better last check than a fast full strum because you can see small movement without waking every open string.
Centerline workflow
- Choose the Open G preset after the one-time unlock is active.
- Tune the low strings in order: D, G, D, with the other strings damped as much as possible.
- Tune the third string to G, then the second to B, then the first to the high D.
- Use Guitar or Simple for the coarse move, then Strobe for the final slow settle.
- Finish with a light open strum and a quick All strings pass if you want a whole-neck confirmation.
What the live app does today
- The Android release includes four clear displays for fast correction and final cleanup.
- Open G, the other alternate tunings, and A4 calibration unlock once. There is no subscription timer behind them.
- It is strongest when you want a preset target and a stable visual read while the guitar settles.
If the repeated D and G strings keep pulling the detector around, shorten the pluck and move the phone closer to the string you are actually adjusting.
Why players use it
One strum, one chord, and a fast path into slide.
Open G is attractive because even simple bar shapes sound complete. That makes it useful for slide guitar, roots rhythm parts, and any arrangement where you want a wide open chord without dense fingering. It also means the guitar is alive while you tune it: once the low strings are close, sympathetic ringing starts everywhere. Centerline's low-noise interface helps, but the best results still come from tuning with intention instead of treating Open G like a regular E-A-D-G-B-E pass.
If you switch between standard and Open G often, keep an eye on the third string. That G can drift more than expected after the rest of the neck moves, and it changes the feel of the open chord immediately when it does.
Related guides
More Centerline tuning references
These notes describe the Centerline Android release available today.