Below you can see the front-view size comparison of the Olympus TG-4 and Fujifilm X-T10. The Olympus TG-4 is clearly the smaller of the two cameras. Its body is 6mm narrower, 17 mm shorter and 10 mm thinner than the Fujifilm X-T10.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.