It appears that the domain "jetcode.app" is currently registered but may still be available for purchase, as indicated by the Afternic page. Unfortunately, there is no accessible information about a product named "JetCode" associated with this domain. It's possible that the product is either not publicly available, has been discontinued, or the website is under development. Without additional information or an alternative source, I'm unable to provide a detailed description of JetCode, its key features, or the primary value it offers to users. If you have more context or another source related to JetCode, please share it, and I'll be glad to assist further.