Yes.
You do not need to have a finished logo concept before using Rebrand.
Start with your brand name, what your brand does, and a few words describing the personality or visual direction you want.
For example:
Modern fitness brand with a bold identity
Minimal coffee brand with an elegant feel
Playful gaming brand with a bold graphic
You can explore the four variations Rebrand creates and try new directions until you find one that fits your brand.