Our Comic Lab in the Playground: An experimentation class

[John Cribati]

I'd say no. They need to be able to manipulate objects with a fair level of precision in order to develop, and use, technology. I can't see a claw being that dexterous.

An actual crab has 8-10 limbs, two of which are claws. I was thinking that my aliens would have 4 legs, 2 arms with hands, and 2 arms with claws. Claws would be better for a warrior race, but 4 hands would make technology and such a lot easier.