GTK Player's Toolkit Get the app

GTK · Ukulele

GTK – Ukulele Player's Toolkit

Tools for your ukulele journey.

Everything from the guitar toolkit, rebuilt around re-entrant tuning and the four sizes of ukulele – so the fretboard you see is the one in your hands.

Download on theApp Store See all tools
  • $9.99 one-time
  • Version 1.3.2
  • 15.2 MB
  • iPhone · iPad · Mac (Apple silicon)
E C G C
C major, standard GCEA

Highlights

Made for ukulele players

4,200+ voicings

Chord Master and a 100+ type Chord Library across Standard, Low G, D and Baritone tunings.

Sized to your uke

Fret ranges match Soprano, Concert, Tenor or Baritone automatically.

Scale Sharing

Overlay up to four scales, triads or chords to find the notes they have in common.

Note Practice

Learn the neck with tempo drills and timed practice.

Inside the app

See it in action

Chord Master on ukulele with the Library tab selected. Dm is typed in the search box, with a count of 68. Four-string chord diagrams for Dm, Dm/F, Dm11, Dm11/C, Dm11/G and Dm6 are shown, each with a play button, a heart, an arpeggio button and the note under each string. The tabs are All, By Key and Favorites.
Library: search for a chord and see how to play it on four strings.Chord Master guide
Chord Library on ukulele, the All tab with an empty search box and a count of 3,015 chords. Four-string chord diagrams for A, A/C♯, A/E, A11, A11/D and A11/G are shown in a grid, each with a play button, a heart, finger numbers and the note under each string. A is saved as a favourite.
The All tab: 3,015 chord diagrams, each ready to play.Chord Library guide
Edit Chord on ukulele: an Em shape at the 2nd fret on the C, E and A strings with the G string muted, with its chord diagram below.
An Em shape at the 2nd fret.Custom Chords guide
Chord Build on ukulele in GCEA tuning with the notes C, E and G switched on in red, green and blue. The name C is shown large, with Em3 and GP4 listed as alternatives at 67%. The four-string fretboard (A, E, C, G) shows every C, E and G from the open strings to fret 6.
Select C, E and G: GTK names the chord C and marks every one of those notes on the neck.Chord Build guide
Chord Explore on ukulele in GCEA tuning. A table lists the notes placed on strings 1 to 3: A open on the A string, F♯ at fret 2 on the E string and D at fret 2 on the C string. The fourth (G) string is muted, with a red X, and struck through in the table. The name D is shown large, with AP4/D and F♯m3/D at 67% as alternatives.
Tap the fretboard: GTK names the shape you are holding, D, with the G string muted.Chord Explore guide
Chord Transposer with Actual Key C, Desired Key G and Capo on Fret 0. In the Chord Progression list, Instead of Cm, Dm, E7, E, G and Am becomes Play Gm, Am, B7, B, D and Em; the Capo column is empty and Effective matches Play.
C to G, no capo: Cm, Dm, E7, E, G, Am become Gm, Am, B7, B, D, Em.Chord Transposer guide
Scales on ukulele set to the C major scale: the notes C, D, E, F, G, A and B with scale degrees 1 to 7, and their positions on the fretboard as colour-coded note names. The four strings are labelled A, E, C and G.
C major across the neck, with its notes and scale degrees.Scales guide
Scale Sharing on ukulele with four scales listed: C Major (blue) and A Minor (green) switched on, F Major and G Major switched off. The fretboard shows each note in one of the two colours, with dots split into blue and green pie slices where the scales share a note. The four strings are labelled A, E, C and G.
C major and A minor: the same seven notes, so every dot is shared.Scale Sharing guide
Triad Sharing on ukulele, the Triads tab, with only C (blue) switched on and only the 123 string-set box ticked; 234 is unticked. The fretboard shows the notes C, E and G as blue dots on the top three strings only (A, E and C); the G string is empty.
One string set: with only 123 ticked, C’s triad appears on the top three strings alone.Triad Sharing guide
Chord Sharing on ukulele, the Chords tab, with a box for entering a chord name and four chords listed: Daug9 (D, F♯, A♯, C, E), D7, Am7 and Emaj7. Only Daug9 (blue) is switched on. Its notes are shown across the fretboard (the four strings A, E, C and G), with the root D ringed.
Type a chord name, even an unusual one like Daug9: its notes across the neck, root ringed.Chord Sharing guide
Position Finder on ukulele set to the key of G major at fret 5: the notes G, A, B, C, D, E and F♯, with their positions on the fretboard from fret 3 to 10 and coloured rings marking groups of notes to improvise around. Fret 5 is not the root, so the Key and Mode toggle appears, and the shape is named C Lydian.
Song moves to G: its notes around fret 5, with rings to improvise in.Position Finder guide
Circle of Fifths with Key C and Mode Ionian. C is blue at the top of the wheel, F is red on its left and G is green on its right, with Am, Dm, Em and B° shaded inside. The centre of the wheel is empty because C has no sharps or flats. Below, Diatonic Chords in C Ionian lists I C, ii Dm, iii Em, IV F, V G, vi Am and vii° B° with the notes of each chord.
C Ionian: C major, with F and G either side and no sharps or flats.Circle of Fifths guide
Mode Converter turning C Dorian into D Phrygian, up 2 semitones, with the colour-coded notes and scale degrees of both modes.
C Dorian to D Phrygian: same notes, new home, up 2 semitones.Mode Converter guide
Note Practice on ukulele asking for the note D on string 1, with the answer shown at fret 5 on the A string.
String 1, note D: fret 5 on the A string.Note Practice guide
Tuner showing C♯ at 140.0 Hz, 17.1 cents sharp, on the needle gauge.
Needle gauge, cents offset and Hz readout.Tuner guide
Metronome at 120 BPM with four beats per measure, preset tempos, tap tempo and the current beat highlighted.
Set the tempo, tap it in, or pick a preset.Metronome guide

Everything included

16 tools, one app

Chords

Theory

Practice

Utilities

Tunings & fretboard

Fits your instrument

Chords
4,200+ voicings
Scales
80+ scales in 14 categories
Frets
Soprano 12 · Concert 15 · Tenor 18 · Baritone 20
  • StandardG C E A
  • Low GG (low) C E A
  • D tuningA D F♯ B
  • BaritoneD G B E

What's new in 1.3.2

  • Fret ranges now match your ukulele type (Soprano 12, Concert 15, Tenor 18, Baritone 20).
  • New splash screen and app icon.
Full version history on the App Store →
  • One-time purchaseNo subscriptions, no in-app purchases, no ads.
  • Works offlineEverything runs on your device. No account, no internet needed.
  • No data collectedAudio for the tuner is processed on-device and never recorded or sent.
  • Family SharingBuy once and share with up to six family members.
Download on theApp Store Questions? Read the FAQ

The family

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