FretBud shows you many scales and chords on the guitar, bass and ukelele fretboards with many tuning choices and ability to create custom tunings as well.
You can even create 7 string guitar or 8 string bass tunings!
Also, you can customize the fretboard and change the fret count, starting fret, showing fret numbers, string names and note names.
It shows vertical fretboard on portrait mode and shows horizontal fretboard in landscape mode.

FretBud offers its core components MusicTheory, CircleOfFifths, and Fretboard for Mac, iOS and tvOS completely open source on GitHub.
Check them out at:
https://github.com/cemolcay/MusicTheory
https://github.com/cemolcay/CircleOfFifths
https://github.com/cemolcay/Fretboard

Supported Scales:
- Major
- Minor
- Harmonic Minor
- Melodic Minor
- Pentatonic Major
- Pentatonic Minor
- Pentatonic Blues
- Pentatonic Neutral
- Ionian
- Aeolian
- Dorian
- Mixolydian
- Phrygian
- Lydian
- Locrian
- Dim half
- Dim whole
- Whole
- Augmented
- Chromatic
- Roumanian Minor
- Spanish Gypsy
- Blues
- Diatonic
- Double Harmonic
- Eight Tone Spanish
- Enigmatic
- Leading Whole Tone
- Lydian Augmented
- Neopolitan Major
- Neopolitan Minor
- Pelog
- Prometheus
- Prometheus Neopolitan
- Six Tone Symmetrical
- Super Locrian
- Lydian Minor
- Lydian Diminished
- Nine Tone Scale
- Auxiliary Diminished
- Auxiliary Augmented
- Auxiliary Dim Blues
- Major Locrian
- Overtone
- Diminished Whole Tone
- Pure Minor
- Dominant 7th

Supported Chords:
- maj
- min
- aug
- b5
- 5
- dim
- 6
- minor 6
- 6add9
- minor 6add9
- Dominant 7th
- Major 7th
- minor 7th
- minor Major 7
- aug7
- dim7
- 7b5
- m7b5
- 7#5
- m7#5
- 7b9
- m7b9
- 7#9
- 7#5b9
- sus4
- sus2
- 6sus4
- Major 7sus4
- 7sus4
- 9sus4
- Major 9 sus4
- 9
- Major 9
- minor 9
- minor Major 9
- add 9
- minor add9
- 9#11
- 9b13
- 11
- Major 11
- minor 11
- minor Major 11
- 7add11
- Major 7add11
- minor 7add11
- minor Major 7add11
- 13
- Major 13
- minor 13
- minor Major 13
- minor Major 7add13