Circle of Fifths Quick Look is a simple app that does one thing--let you select Major and minor keys and see their semitones and signatures. Semitones and signatures are just a quick glance away. Works with treble, bass and C clefs.
Zoom into the current key and it fills your Apple Watch screen, making it easy to see the semitones and signature.
Add the Circle of Fifths Quick Look complication to your favorite watch face. Your Circle of Fifths Quick Look reference is even easier to use and always shows the last key and clef you selected.