The first ever prototype, although, was designed by Ron Wayne.
The original logo depicted Sir Isaac Newton sitting under an apple tree, with one fairly obvious apple sticking out.
Colourful Apple: The logo was designed by Rob Janoff.
The silhouette of apple with a bite taken out of it, coloured with the rainbow. Now, you might not remember the one coloured with the rainbow, which was the official logo for the company between 1977 and 1998. Because, Apple began using the monochromatic version of this logo by August, 1999.
And Now Apple’s logo :