I will use this tool personally for debugging the palettes in GIF images.
Can you guess which game these colors are from? Post your answer in the comments!
v1.0, released March 15th, 2019: Initial release. Not that good.
v1.1, released March 15th, 2019: Fixed a mistake where the numbers on the right and bottom didn't really replicate the color palette table offsets in a file. Minor grid change. The number of rows and columns now change according to the GIF_HEAD input byte.