GuitarTool

GUITAR TUNER · iPHONE & iPAD

Offline Guitar Tuner for iPhone

A clear, private guitar tuner that shows the note, cents offset, input strength and stability—without an account, ads or an internet connection.

Download free on the App Store↗

Free · fully offline · no ads · opens the tuner product page

  • Standard and alternate tunings
  • A4 calibration from 430–446 Hz
  • Audio stays on your device
01

Tune the instrument you actually play

Choose automatic chromatic detection or lock onto a target string. GuitarTool covers standard EADGBE, half-step and whole-step down, Drop D through Drop B, DADGAD, Low C and Open D, E, G, A and C. Reference tones help when the room is noisy or you want to tune by ear.

  • Cents and frequency readouts
  • Signal-strength and stability feedback
  • Guitar, bass, violin-family and mandolin modes
02

Built for a quick practice start

The tuner is one part of a focused offline toolkit. Move straight from tuning to a 20–500 BPM metronome or look up a chord without signing in, waiting for a feed or dismissing an ad. Microphone input is processed live and is never saved or uploaded.

  • No registration or cloud profile
  • No advertising or tracking SDK
  • Works on iPhone and iPad

One app for the full practice flow

Tune first. Keep time. Find the next chord.

Download GuitarTool free↗

FAQ

Common questions

01Does the tuner need internet access?＋

No. Pitch detection and every core practice tool work entirely offline.

02Does GuitarTool record my guitar?＋

No. Microphone audio is analyzed in real time on the device and is not stored or transmitted.

03Can I tune to something other than A4 = 440 Hz?＋

Yes. The calibration range is 430–446 Hz.

KEEP EXPLORING

↗Drop D Tuning Guide and Offline TunerTune guitar to Drop D (DADGBE) with an offline iPhone tuner. Learn the string notes, tune from standard and check every string with cents feedback.↗DADGAD Tuning Guide and Offline TunerTune guitar to DADGAD with an offline tuner for iPhone and iPad. Follow the six target notes and verify cents, frequency and signal stability.↗Open G Tuning Guide and Offline TunerTune guitar to Open G (DGDGBD) offline. See every target note, move safely from standard tuning and verify pitch with cents and stability feedback.↗Half-Step Down Guitar Tuning GuideTune every guitar string down a semitone to Eb Ab Db Gb Bb Eb with a private offline tuner, cents display and 430–446 Hz calibration.↗Offline Chromatic Tuner for String InstrumentsUse an offline chromatic tuner on iPhone or iPad with note, cents, frequency, signal-strength and stability feedback for guitar and other strings.↗Ukulele GCEA Tuning: High G and Low GTune ukulele to High-G or Low-G GCEA with an offline iPhone tuner. Learn the octave difference and verify each string with cents feedback.