Which earlier republic's flag inspired Ecuador's yellow-blue-red tricolor?

Ecuador’s yellow-blue-red tricolor was inspired by the flag of Gran Colombia.

Gran Colombia was a short-lived republic that existed from 1819 to 1830 and encompassed territories corresponding mainly to present-day Colombia, Ecuador, Venezuela, and Panama. Its flag established the Pan-Colombian color scheme that later influenced the national flags of the republics formed after its dissolution.

Ecuador adopted versions of the tricolor during and after its association with Gran Colombia. Although Ecuador temporarily returned to blue-and-white designs after the 1845 Marcist Revolution, Gabriel García Moreno restored the Gran Colombian tricolor on September 26, 1860. The design became definitive in 1900, when the coat of arms was added for official state use.

The deeper origin reaches back one step further: Gran Colombia’s flag was based on Francisco de Miranda’s Venezuelan tricolor. Thus, Gran Colombia is the immediate earlier republic whose flag directly supplied the model, while Miranda’s design is the revolutionary source behind the broader color tradition.