Centerline vs Intunator

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.

Intunator is an intonation-training app that recognizes a played note and plays back a corrected version for musicians to match by ear. It is designed for wind, string, and plucked-instrument players, as well as vocalists, and detects pitches across nearly seven octaves. Its display can show note names or solfege and graphically indicate pitch deviation. Settings include 56 instrument choices, transposition, concert pitch, background noise, note spelling, and pitch-detection options. Drone Mode provides a sustained chosen note for practice in equal or just temperament. Corrected notes can play through headphones or speakers, with fifth or octave offsets and three output sounds; turning off the control tone allows tuner use. Intunator is available for iOS and Android. The iOS INTUNATOR STARTUP version has a four-week free test, and TUNER PRO without the control tone has a two-week free test. Android renting and free testing are still in planning. Listed plans range from €2.99 a month for Tuner Pro to €49.99, paid once for Intonation Trainer Lifetime.