StableBit Scanner is an application (or website) that provides system health monitoring, diagnostics, and repair for Windows PCs, servers, and workstations. It can detect and report hardware problems such as failing hard drives, overheating components, and failing power supplies. It can also detect and repair corrupt Windows registry entries, detect malware, and optimize system performance. Additionally, it can scan for and repair bad sectors on hard drives, detect and repair disk fragmentation, and monitor disk health. StableBit Scanner also provides a dashboard view of the system health and performance, as well as the ability to create custom system health reports.
They, more or less, do the same things.