We demonstrate an interior design solution with advanced features, most importantly, a diminished reality feature. The diminished reality functionality takes 3D indoor structures into account and adapts to the lighting of the environment. We present two demonstrations on tablet and laptop. The iPad version utilizes touch screen for selecting removed objects from the image. It allows users to build modular furniture and it casts shadows of the virtual furniture for realistic visualization result. On laptop PC we demonstrate real time diminished reality for indoor AR with several options. Our demonstrations are optimized for interior design and indoor AR.