Ultimate Calculator V1.0 By Uniquesw [updated] -

UniqueSW later released and v3.0 , which added 2D graphing, matrix operations, and a skin system. However, many purists stick to v1.0 because it represents the peak of the "single-purpose tool" philosophy. By v3.0, the software had expanded to nearly 10 MB and introduced a registration key system that occasionally caused activation headaches.