Flip Cards turns each letter over like a split-flap board in an old railway station — every character flips independently until the whole word lands.
fc-flip rotates each glyph about its horizontal midline on a stagger, so characters land in sequence like a real split-flap rather than all at once. The hinge sits at the centre line, which is what distinguishes it from a simple vertical spin.
Flip Cards turns on the horizontal axis with the hinge at the letter's midline, like a departure board. 3D Rotate turns on the vertical axis, like a panel swinging on a post.