Q: The app I’m using for Mass says that there’s a creed throughout the weekdays of the octave of Christmas. Is that correct?
A: No. The best place to look is the missal, where you’ll see a note to include the Gloria, but nothing about a creed.
Sometimes apps are wr1ong. Sometimes the ordos are wrong. Golly, sometimes I’m wrong too. But the missal is pretty reliable.