SPC for Excel is professional-grade statistical process control software for Microsoft Excel, pioneered in 1995 and trusted by more than 100,000 quality professionals in over 80 countries. Built for quality engineers, Lean Six Sigma practitioners, and process improvement teams across manufacturing, healthcare, laboratories, and regulated industries, it provides 30+ control charts, process capability analysis, Gage R&R and EMP measurement system analysis, Pareto diagrams, DOE, ANOVA, regression, hypothesis testing, and more — all within the familiar Excel environment. No separate application to learn and no annual subscription: a one-time perpetual license starting at $329, with free technical support and a knowledge base of 250+ articles by founder Dr. William McNeese.