Centerline

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Score7.2

Rank#3 of 32

PriceFree

Free planYes

Runs onAndroid, iOS, macOS

Summary

Centerline is a chromatic tuner for Android, iPhone, and Mac that identifies a played note and indicates whether it is flat or sharp and where its pitch settles. Chromatic mode covers 62–800 Hz and offers Simple, Trail, Strobe, and Workbench views; Trail displays six seconds of pitch history. Guitar mode can detect a string automatically or let players select one, and includes standard tuning, All Strings progress, and a headstock view. Tuning works offline, and pitch analysis stays on the device: microphone audio is not recorded, saved, transmitted, or shared. The free Chromatic plan includes the core tuning modes and views. Centerline Complete costs 3.99 USD per once and adds alternate and custom six-string tunings, capo settings, A4 calibration from 432–446 Hz, and reference tones. The app has no ads or account system, and optional analytics are off until enabled. All Strings tracks individual readings but cannot measure a chord at once; chromatic mode also omits the full piano range and a bass guitar’s lowest notes.

Who it is for

Centerline suits musicians who want an offline tuner with chromatic and guitar modes, multiple display views, and on-device pitch analysis.

What is good

Chromatic mode covers 62–800 Hz.
Four chromatic display views are available.
Works offline without an account or ads.
Pitch analysis happens on the device.
Complete adds alternate and custom tunings.

What to know first

All Strings does not measure a chord at once.
Chromatic mode omits the full piano range.
Chromatic mode omits a bass guitar’s lowest notes.
No trial or recurring charge is available.

Verdict

Centerline combines chromatic and guitar tuning with offline use and on-device audio analysis. The free plan covers core tuning, while the one-time 3.99 USD per once purchase adds more tuning options and reference tools.

Centerline plans and pricing

All plans

Chromatic Free Chromatic tuning, 62–800 Hz · four display views · Guitar mode and six Guitar views centerlinetuner.com · 29 Sept 2026

Centerline Complete $3.99 once One-time purchase; App Store price shown as $3.99 Drop D, Half step down, D standard, DADGAD, Open G · custom six-string tunings · capo settings · A4 calibration (432–446 Hz) · reference tones apps.apple.com · 29 Sept 2026

Compared on musical tuner apps

Free plan: Yescenterlinetuner.com
Strobe display: Yescenterlinetuner.com
Alternate tunings: Yescenterlinetuner.com
Custom reference pitch: Yescenterlinetuner.com
Intonation monitoring: Yescenterlinetuner.com
Offline mode: Yescenterlinetuner.com
Available platforms: bothcenterlinetuner.com

Facts

Purpose: Centerline is a chromatic tuner that shows the note played, whether it is flat or sharp, and where the pitch settles.centerlinetuner.com · 29 Sept 2026
Frequency range: Chromatic mode supports 62–800 Hz and follows the nearest note, including sharps and flats.play.google.com · 29 Sept 2026
Display views: Chromatic mode has Simple, Trail, Strobe, and Workbench views; Trail shows six seconds of pitch history.play.google.com · 29 Sept 2026
Guitar mode: Guitar mode provides automatic string detection, direct string selection, standard tuning, All Strings progress, and a headstock view.play.google.com · 29 Sept 2026
Pitch analysis: Pitch analysis happens on the device, and the app does not record, save, transmit, or share microphone audio.centerlinetuner.com · 29 Sept 2026
Offline and accounts: Tuning works offline, and the app has no ads or Centerline account system.centerlinetuner.com · 29 Sept 2026
Optional analytics: Usage analytics is off until enabled and, when enabled, excludes audio and pitch data.centerlinetuner.com · 29 Sept 2026
Purchase handling: The optional unlock is a one-time store purchase; the app does not receive payment-card details or require an account.centerlinetuner.com · 29 Sept 2026
Notable limit: All Strings remembers individual readings but does not measure a chord at once; chromatic mode does not cover the full piano range or a bass guitar’s lowest notes.play.google.com · 29 Sept 2026
Support: Questions or feedback can be sent to [email protected].play.google.com · 29 Sept 2026
Platform availability: The App Store listing specifies iPhone and Mac availability, and the maker’s site links to Android and iPhone downloads.apps.apple.com · 29 Sept 2026
No trial: The maker states there is no trial and no recurring charge.centerlinetuner.com · 29 Sept 2026