Product facts
Centerline facts
Current product information from Endpaper Labs LLC
Centerline is a chromatic tuner for musicians who want a clear, private way to tune one note at a time.
Where Centerline works
Centerline is available on Android, iPhone and Mac. Chromatic mode follows the nearest note from 62 to 800 Hz; Guitar mode adds six-string tuning tools.
Privacy and audio
No account is required. No ads are shown. Works offline. Audio is analyzed on your device in real time to detect pitch, then discarded.
Free core and optional extras
Chromatic tuning and every display are free. An optional one-time unlock adds alternate and custom six-string tunings, capo, A4 calibration, and reference tones. There is no subscription. Your store shows the local price before you buy.
Official downloads
Get Centerline on Google Play or download it from the App Store for iPhone and Mac.
More details
Read the Drop D tuner guide for a free Chromatic and optional preset example, or the Centerline privacy policy for details about data handling.