Open D Ukulele Tuner
Tuner
Ukulele Open D (A D F# A) • 4 strings • 440 Hz
Detected
Target
440.0 Hz
Select String
Ready to tune?
Click "Start Listening" and select a string to tune. Auto-detect is assist-only and works best when the string is already close to pitch.
Tune the fourth through first strings to A4 D4 F#4 A4. The open strings form D major. This preset raises G4, C4, and E4 by a whole step from high-G standard, so use strings and an instrument setup approved for the extra tension.
Note Layout
Notation
A4 D4 F#4 A4
How to Tune
Click "Start Listening"
Allow microphone access when prompted.
Play Each String
Auto-detect will find the string, or click to select manually.
Adjust Until Green
Center the needle and watch for the green "In Tune" indicator.
Tune Open D safely
Confirm the string set is intended for these raised targets
Stop if a string or the instrument feels unusually tight
Use small peg movements and approach each note from below
Make several light passes while nylon strings settle
About Open D ukulele tuning
History & context
A4 D4 F#4 A4 is a re-entrant D-major layout with doubled fifths. Its raised register gives compact, bright chord voicings.