EchoVel is a versatile and precise mobile application designed specifically for engineers and scientists working in materials science, acoustics, and related technical fields. The app provides three essential calculation tools including Rigidity Modulus calculator for determining shear modulus from stress and strain values, Separator Sizing calculator for designing gravitational separators using Stokes Law principles, and Speed calculator for computing sound wave velocities through different media using elastic properties. With an intuitive user interface featuring smooth animations and comprehensive data persistence, EchoVel streamlines complex engineering calculations while maintaining accuracy and efficiency. The application supports iOS 13.0 and above, offers portrait orientation for optimal mobile use, and includes robust input validation and result sharing capabilities to enhance productivity for technical professionals.