is a software collection developed by a Russian programmer known online as "Ratiborus." It is designed to activate Microsoft products by emulating a Key Management Service (KMS) server. In corporate environments, KMS is a legitimate technology that allows organizations to activate multiple computers on a local network without connecting each to Microsoft's servers. Ratiborus repurposed this technology to create an offline activator.
Microsoft allows you to use Windows 10/11 unactivated indefinitely with only cosmetic limitations (a watermark, no personalization). For Office, consider , Google Docs , or a cheap one-time purchase key from authorized resellers (often $30-50 on sale). Kms Tools Ratiborus
As of 2025, the latest stable release is (date-stamped). Check Ru-Board for updates. is a software collection developed by a Russian