Cdim7
C diminished 7th
C · E♭ · G♭ · A
C diminished 7th is generally considered a harder chord to play, since even its easiest full voicing needs a barre. There are 7 ways to play it below, plus a capo shortcut and an easier substitute for when the barre isn't there yet.
Click any shape to hear it played.
Every way to play it
No capo. 7 shapes, easiest first.
Sounds similar
A different, easier chord. These play their own notes, so you can hear the difference.