This document describes the development of a DC circuit analysis software called CiRSiS using Microsoft Visual C#.Net. The software can analyze purely resistive planar circuits by calculating the current through each component, voltage across each component, and power dissipated by each component. It also displays the direction of current flow. The software was developed using equations, pseudocode, algorithms, flowcharts, and C# code. Test calculations on sample circuits showed the software results matched manual calculations with an average error of 0.339%, demonstrating the reliability of the software for circuit analysis and simulation.