How these tools work
Each tool is a few hundred lines of plain JavaScript that run on your device. The Office Version Checker maps Microsoft's build numbers to release names; the Windows Key Checker validates the 25-character structure and compares against Microsoft's published generic and KMS keys; the Compatibility Checker applies Microsoft's published system requirements; the Deployment Calculator uses our live catalogue prices. None of them can tell whether a key is genuine — only Microsoft's activation servers can — and each one says so where it matters.
Found a mistake, or want a tool we have not built? Tell us. We maintain these the same way we maintain the shop: when a customer points at a problem, we fix it.