Legacy code refactoring is a critical challenge for CTOs managing aging systems like COBOL. While manual refactoring offers high accuracy, it's costly and time-consuming, and generative AI lacks the reliability to handle complex legacy systems. Transpiler-based tools strike the right balance, achieving 85-95%+ accuracy while reducing cost and time. This article explores the six key pillars of evaluation—Cost, Time, Accuracy, Equivalence, Risk, and Maintainability—and how Recodex’s proven framework helps CTOs modernize with confidence. Discover why legacy application modernization demands a tailored approach and how to choose the right method for your organization.