• 1

    Cent Display

    Displays the deviation of the measured pitch compared to the perfect pitch.

  • 2

    Info Button

    Quick access to transposition, reference tone and temperament.

  • 3

    In-tune Indicator

    LED-like indicator and a ring start glowing when the measured pitch meets the in-tune condition, which can be set to your own preference.

  • 4

    Cent Meter

    Displays the measured pitch on a scale from -50 cent to +50 cent.

  • 5

    Fine-tuning Indicator

    A red and yellow wheel starts spinning when the measured pitch is close to the perfect pitch. The slower the wheel spins the better the tuning. The tuner allows you to measure sound with very high precision (around 0.1 cent).

  • 6

    Pitch Pipe

    Pressing the fork symbol starts emitting a sine wave tone. The pitch of the tone can be adjusted.

  • 7

    Pitch Detection

    Displays the name of the note that is closest to the measured pitch.

  • 8

    Frequency Reading

    Displays the frequency reading of the measured pitch.

  • 9

    Chromatic Circle

    Gives visual feedback of the measured pitch as a tone on a chromatic scale.

  • 10

    Sound Pressure Meter

    Indicates the current sound pressure meaning the sound emitted from your instrument plus the sound from the environment.

  • 11

    Sound Pressure Threshold

    Moving the knob to the left increases the threshold level, whereas moving it to the right decreases the level. A high threshold value eliminates background noise better.

Pitch Detection

General Outline

Two things are of great importance when you tune your instrument.

  • circleThe sound input has a direct influence on the app’s ability to produce an accurate and reliable pitch detection at all times.
  • circleThe measured tone is displayed based on temperament, reference tone, and transposition.

Sound Pressure Meter

When you tune your instrument play a loud and clear tone on your instrument. The sound pressure reading should exceed the blueish area on the sound level meter in order for the application to process the sound. Adjust the sound pressure threshold to fit your instrument and environmental conditions. Try to lift the sound level of your instrument above the background noise in your environment.

Quick Settings

The Info Button in the upper right corner allows you to change temperament, transposition, and reference tone (A4) at any time. First select the relevant category. A popover appears with a list of values to choose from. Pick a value from that list. The changed setting will immediately take effect.


Tuning and pitch estimation depend on the selected temperament. Select the temperament that fits your instrument. Always use Equal Temperament, if you don’t know what temperament means.

Reference Tone

The A note in the fourth octave, hence A4, is used as a reference point for any tuning. This note is typically set to 440 Hz, but can be set to any value in the interval 400 – 480 Hz.


If your instrument has a natural key different than C, say B flat, you may shift the display two semitones up to compensate for the natural key of you instrument.

Cent Meter

Flat Pitch

In case the measured tone is too low compared to the perfect pitch, the cent meter displays a bar that extends to the left. Furthermore a flat symbol is displayed at the very left-end of the cent meter.

Sharp Pitch

If the measured tone is too high compared to the perfect pitch, the cent meter displays a bar that extends to the right. Furthermore a sharp symbol is displayed at the very right-end of the cent meter.

In-tune Pitch

If the measured tone is almost equal to the perfect pitch, the LED on the cent meter as well as a ring around the pitch detection start glowing. The permitted deviation from the perfect pitch is determined by the in-tune threshold (cf. settings view) that you can set to suit your instrument and playing style.