* Algol (β Persei) is a binary star system, with the primary star being a blue-white subgiant (spectral type B8). It appears white-blue to the naked eye.

* Rigel (β Orionis) is a blue supergiant star (spectral type B8Ia). It appears bright blue to the naked eye.

While both stars share a similar spectral type (B8), Rigel is a much more massive and luminous star than Algol, resulting in a slightly bluer appearance.