Flags that look alike

How alike are they

Some flags are close enough that people mix them up. This page ranks the 196 flags in this list by how alike their pictures are: each flag is shrunk to 24 by 18 pixels and the average colour difference between two flags is compared, also trying each one flipped, since a flag and its mirror image are easy to confuse. The 2 closest pairs have a difference under 400 on a scale that runs into the thousands for unrelated flags.

The closest pair is Indonesia and Monaco, with a difference of 280. Nicaragua and El Salvador come next at 345, then Netherlands and Paraguay at 415. Pairs that look alike on the page are not always alike in the real world: flags differ in the exact shade of a colour and in proportions, which a small picture hides.

Why so many look alike

Why so many are alike: a lot of countries chose the same few colours — red, white and blue is on 25% of these flags — and a two- or three-band layout leaves little room to differ. Flags that share a history, such as former federations, tend to share colours too.

What this does not tell you

This is a visual measure only. It does not say which flag came first, and it can miss pairs that differ in one large element. Use the finder to narrow by colour and symbol when you need a flag that is specific rather than similar.

How the flags are labelled. Images are from the open-source flag-icons set (MIT). Colours are measured from each image; symbols are labelled by hand. Names follow the source lists and do not imply any judgment on the status of any territory. Sources and limits.

How to use the ranking

The list above is ordered from most alike to less alike. A lower difference number means the two pictures are closer. Use it in two ways: to check whether the flag you are holding in mind is easily confused with another, or to look up a pair you suspect you have been mixing up. Pairs near the top are the ones where a glance is not enough and you need to look at details.

What to check when two flags match

Start with the order of the colours. Ranking by picture treats a flag and its upside-down version as close, so the same bands in reverse order are a genuine difference, and the list notes 3 pairs where a flipped match was needed to make them look alike. Next, look for an emblem in the centre or at the hoist, which is the side nearest the pole. Many flags that look the same in a small picture differ in this one place. Finally, look at the proportions; flags are not all the same shape, and a thumbnail scales them to a common size.

The pairs at the very top of the ranking are Indonesia and Monaco; Nicaragua and El Salvador; Netherlands and Paraguay; Bolivia and Ghana; Romania and Chad. In such cases the telling detail is often small, such as a crest, a stripe, or a shade, so the most reliable way to know which flag you are looking at is to check the centre first.

Three pairs worth a second look

Indonesia (Asia) and Monaco (Europe), difference 280: the first has 2 horizontal bands and the colours red and white; the second has 2 horizontal bands and red and white. They measure as the same set of colours, so the difference has to be found in proportion, shade or a small detail. They are on different continents, so the continent box in the finder separates them at once.

Nicaragua (North America) and El Salvador (North America), difference 345: the first has 3 horizontal bands and the colours blue and white; the second has 3 horizontal bands and blue and white. They measure as the same set of colours, so the difference has to be found in proportion, shade or a small detail. They are on the same continent, which makes the mix-up more natural.

Netherlands (Europe) and Paraguay (South America), difference 415: the first has 3 horizontal bands and the colours red, white and blue; the second has 3 horizontal bands and red, blue and white. They measure as the same set of colours, so the difference has to be found in proportion, shade or a small detail. They are on different continents, so the continent box in the finder separates them at once.

Where the confusion comes from

Three habits cause most mix-ups. People remember the colours but not their order. They remember the order but not the proportions. Or they remember an emblem only vaguely and treat a plain field as the same as a decorated one. The ranking cannot fix memory, but it shows where each habit leads: pairs of plain horizontal bands are the classic case for the first two, and pairs separated only by a crest are the case for the third. Knowing which habit you are prone to tells you which detail to check first.

Why shade and proportion matter

The comparison shrinks each flag to a tiny grid, which is good for catching broad similarity but erases fine lines. Two flags that rank as near twins can have different blues, different reds, or different width-to-height ratios when seen full size. For that reason the page does not claim that the flags are the same, only that their pictures are alike at low resolution.

Using the finder instead

When you do not have a specific pair in mind, the finder is more useful. Tick the colours you can see and the largest symbol, then compare the handful of flags that remain. The ranking here tells you which of those remaining flags to check twice.

Questions

Does a high rank mean one flag copied another? No; the ranking measures pictures, not history. Why are some flags I think are alike missing? Only the closest 60 pairs are kept and 196 flags are compared. Can a pair appear twice? A flag can appear in several pairs, since one design may resemble more than one other.