The design is related to the flags of France and Catalonia, the two states that protect the independence of the small state. A flag of three bars is similar to that of the French Tricolore, while the pattern of a wider middle stripe can be noted on the Catalonian flag. The blue and red of the Andorran flag are also found on the French flag, with red and yellow also being the principal colours of the Catalonian flag. From 1806 to 1866, Andorra's flag was a vertical bi-colour of yellow and red. The motto in the coat of arms in the middle stripe Virtus Unita Fortior means "Strength United is Stronger".
The design is similar to the flags of Romania, Moldova, Chad and the flag of Queen's University in Ontario, Canada. All of these are vertical tricolours of blue, yellow, and red, but unlike that of Andorra, their flags all have stripes of equal breadth.