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SPECIFICTION
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Centerline

centerlinetuner.com

Free plan macOSiOSAndroid
Visit centerlinetuner.com
Spec score 8.4 #6 of 32 in Musical Tuner Apps

What it is

Centerline is a chromatic tuner for identifying played notes and seeing whether their pitch is flat or sharp. Its chromatic range is 62–800 Hz and follows the nearest note, including sharps and flats. Players can choose Simple, Trail, Strobe, or Workbench displays; Trail shows six seconds of pitch history. Guitar mode detects a string automatically or lets users select one, and includes standard tuning, All Strings progress, and a headstock view. Tuning works offline, and pitch analysis takes place on the device: microphone audio is not recorded, saved, transmitted, or shared. The free Chromatic plan includes the core tuning functions and guitar views. Centerline Complete costs $3.99, paid once and adds alternate and custom six-string tunings, capo settings, A4 calibration from 432–446 Hz, and reference tones. The app is available for Android, iPhone, and Mac. It has no ads or account system; optional usage analytics are disabled until enabled and then exclude audio and pitch data.

Spec sheet

Purpose
Centerline is a chromatic tuner that shows the note played, whether it is flat or sharp, and where the pitch settles.Read 29 Sep 2026 · centerlinetuner.com
Support
Questions or feedback can be sent to [email protected].Read 29 Sep 2026 · play.google.com
Headquarters
Sacramento, California, United StatesRead 23 Sep 2026 · centerlinetuner.com
Display views
Chromatic mode has Simple, Trail, Strobe, and Workbench views; Trail shows six seconds of pitch history.Read 29 Sep 2026 · play.google.com
Frequency range
Chromatic mode supports 62–800 Hz and follows the nearest note, including sharps and flats.Read 29 Sep 2026 · play.google.com
Guitar mode
Guitar mode provides automatic string detection, direct string selection, standard tuning, All Strings progress, and a headstock view.Read 29 Sep 2026 · play.google.com
No trial
The maker states there is no trial and no recurring charge.Read 29 Sep 2026 · centerlinetuner.com
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.Read 29 Sep 2026 · play.google.com
Offline and accounts
Tuning works offline, and the app has no ads or Centerline account system.Read 29 Sep 2026 · centerlinetuner.com
Optional analytics
Usage analytics is off until enabled and, when enabled, excludes audio and pitch data.Read 29 Sep 2026 · centerlinetuner.com
Pitch analysis
Pitch analysis happens on the device, and the app does not record, save, transmit, or share microphone audio.Read 29 Sep 2026 · centerlinetuner.com
Platform availability
The App Store listing specifies iPhone and Mac availability, and the maker’s site links to Android and iPhone downloads.Read 29 Sep 2026 · apps.apple.com
Purchase handling
The optional unlock is a one-time store purchase; the app does not receive payment-card details or require an account.Read 29 Sep 2026 · centerlinetuner.com

Plans and prices

Chromatic Free Chromatic tuning, 62–800 Hz · four display views · Guitar mode and six Guitar views Read 29 Sep 2026 · centerlinetuner.com
Centerline Complete $3.99, paid 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 Read 29 Sep 2026 · apps.apple.com

Every Centerline plan and price →

Strong points and limits

Strong points

  • Chromatic mode covers 62–800 Hz.
  • Four chromatic display views are available.
  • Tuning works offline without audio recording or sharing.
  • Free plan includes guitar mode and six guitar views.
  • Complete costs $3.99, paid once.

Limits

  • Chromatic mode misses the full piano range.
  • Chromatic mode misses a bass guitar’s lowest notes.
  • All Strings does not measure a chord at once.
  • No trial is offered.

Who it suits

Centerline suits musicians who want an offline tuner with chromatic and guitar modes, including players who prefer a visual pitch history or strobe display. The paid unlock is for players who need alternate tunings, capo settings, calibration, or reference tones.

Verdict

Centerline covers core chromatic and guitar tuning without requiring an account or internet connection. Its range has stated low- and high-end limits, and All Strings tracks individual readings rather than measuring chords.

Where Specifiction places it

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