Fiji vs British Indian Ocean Territory

Nothing about how they are built was measured the same on both.

Only Fiji: a single-coloured ground, a canton.

Both are flown at the same shape, 2.00 : 1.

Learn to tell them apart →

Both carry a tree.

Fiji carries a cross, a coat of arms, a shield, a bird, a lion, grain, and a ship. British Indian Ocean Territory carries a crown.

Both flags are drawn at 64×48 and cut into squares 8 across. Each square is averaged to one colour, and the score is the worst single square, so two flags that agree everywhere except one corner are as far apart as that corner, which is the right answer to a question about whether anybody could tell them apart. 0 is the same picture; the number is the worst single tile, out of 255.

On that scale Fiji and British Indian Ocean Territory score 44.7 out of 255, which is the 18% above.

It cannot see everything. Both flags are stretched to the same box, so Indonesia and Monaco, which differ in nothing else, are measured as their reds rather than as identical. The look-alikes page sets out the rest.