Which flags look alike
Every flag on this site is compared with every other by a similarity index computed from the images themselves — not from anyone’s opinion, and not looked up. Pick a flag to see its closest matches, or scan the most-confusable pairs across all 195. The index is a measure by the disclosed method below, never a claim that two flags are identical.
Romania
View its page →Closest by our similarity index
Chad96the same vertical band layout; near-identical colour proportions.
Andorra93the same vertical band layout; near-identical colour proportions.
Moldova83the same vertical band layout; near-identical colour proportions.
Belgium79the same vertical band layout; the same colours in similar amounts.
Mali78the same vertical band layout; the same colours in similar amounts.
Bosnia and Herzegovina76the same vertical band layout; the same colours in similar amounts.
The number is our similarity index (0–100) by the method below — not a claim that the flags are “X% identical”. A different weighting would rank these differently.
The other direction: the top of the ranking
The picker above starts from a flag you choose. Starting from the index instead gives the pairs it scores highest of all — the closest 30 of all 18,915 comparisons, headed by Indonesia and Monaco at 99, plus the closest match to every one of the 195 flags.
How this is measured
At build time, each of the 195 flag SVGs is rasterised to a small 64x48 bitmap, and two things are read from it. Every pair is then scored; the page only displays the result.
- Colour. Each pixel’s colour is quantised into one of 27 buckets (3 levels per red/green/blue channel), giving the share of the flag in each bucket. Two flags’ colour similarity is the overlap of those shares. The buckets are deliberately coarse so slightly different shades — two reds, two blues — still count as a match.
- Structure. From the same bitmap: the band orientation (horizontal, vertical, or neither), a 3×3 grid of average colours, and whether a busy central emblem is present. Structure similarity rewards matching orientation, close grid colours, and matching emblem presence.
The overall index is 0.55 × colour + 0.45 × structure, and structure is itself 0.4 orientation + 0.45 grid + 0.15 emblem. These weights are constants, shown here on purpose: change them and the neighbours change.
What it does not measure
This is a computed measure by the method above, not an objective fact. The number is our similarity index from 0 to 100 — never a claim that two flags are “X% identical”. It says nothing about a flag’s meaning, history, or symbolism, and it does not read exact colour codes: hex values are not verified anywhere on this site. A colour-weighted index like this one groups every red flag with a small emblem together; a structure-weighted one would pull them apart. There is no single right answer to “which flags look alike” — this is one disclosed, reproducible answer, and a different weighting would give different neighbours. More on how this site handles what it knows.