CellScop is simple program which simulate cellular automat, a bit similar to caleidoscope. The cells are simulated on 1/8 of square. The remaining 7/8 are copied. The cells has binary state 0 or 1. State of cell in next step is determined on sum of 1 in 3x3 array of cells. The sum can be 0..9. The rule for automat says, which sums will be 1 and which will be zeros. Small number of options can be set. For example foreground and bacground color. It is posible to perform single step, run steps with displaying, without displaying (much faster), invert all cells, invert center cell. And perform duality (mirror cells around diagonal).