Centerline
A fast, private guitar tuner. Open it and pluck a string; the large meter tells you exactly which way to turn.
Four ways to read one pitch
The note and one line. Nothing else on the stage.
Drifting bars that stand still the moment you are in tune.
One row per string, so you can see which ones you have already done.
The six-string diagram, with automatic string detection.
On stage
Priced like a tool
Free forever
Standard tuning with automatic string detection and every display. No trial clock, no nagging.
One purchase
Unlocks Drop D, Half step down, D standard, DADGAD, Open G, and the A4 reference calibration.
Pay once. No subscription.Private by construction
Your microphone audio stays on your device and disappears as it is analyzed. There is no account, no ads, no trackers, and no Internet access of any kind: the app never asks for the network permission. Read the privacy policy.