CrystalDiskInfo

System · Disks

Windows

Open source disk health monitor that reads S.M.A.R.T. data and shows drive temperature, error counts and overall health status. It is MIT licensed with no paid tier.

Get it

Download from the developer

The promise

✓ No ads
✓ No purchases
✓ No subscriptions
✓ No trials
✓ No nagging
✓ No surprise bundles

Transparency

✓ Open source

Something wrong?

Reports go to a human review queue. No timeline promised — this is a small pilot, but every report gets read.