Why does the textured model look so bad in other software? How do I check the textured model?

Texture the model first, click "Export", select "Texture Model", and save the file in "obj" format. Create a new folder, put all of these generated files into the same folder, and open this file format  Name_tex.obj to view the texture model in your software.

Let's take Meshlab as a reference.

To view a textured model in Meshlab, we should open the file NAME_tex.obj and set the Shading as None, Color as Face.

And then we will see the exact color of the model we've seen in Revo Scan after textured.