
Romania
Brighter blue next to the flagpole
- Ratio 2:3, three equal vertical bands.
- The current plain tricolour dates from 1989, when the socialist emblem was cut out of the flag during the revolution.
Short answer:A darker, more indigo blue band indicates Chad; Romania's blue is brighter. Both are 2:3, so shade and context are the practical tests.
Romania and Chad use the same three vertical bands in the same order. The difference is limited to the shade of blue and, in practice, to the source of each design.

Brighter blue next to the flagpole

Darker indigo blue next to the flagpole
Moldova and Andorra use the same colour order but add coats of arms. Andorra also makes its yellow centre band wider than the blue and red bands.