- SigmaXL was designed from the ground up to be cost-effective, powerful, and easy to use. It allows users to measure, analyze, improve, and control their service, transactional and manufacturing process. As an add-in to the already familiar Microsoft Excel, SigmaXL is ideal for Six Sigma training and is used by leading consultants. It is rapidly becoming the tool of choice for Six Sigma professionals and is a fraction of the cost of any major statistical product, yet it has all the statistical and graphical functionality most people need. License includes: One year of technical support from SigmaXL™ and one year of free upgrades.