ConductAR is an augmented reality-based tool which tells users parameters of conductive ink circuit (like sheet resistance) and better options for drawing the circuit with accessible tablet or PC. It recognizes the circuit image and calculates parameters using finite element method (FEM). It also adopts sparse coding for acceleration of inverse matrix problem. ConductAR gives users the knowledge to fix their conductive ink circuit on the spot, without troublesome CAD design process. Combining this with Circuit Eraser, users can try their first design, learn what leads to errors, and erase/redraw their circuit until finishing their artwork.