MemTest86 is a standalone RAM diagnostic program that boots from USB and checks memory for faults without an installed operating system.
Alternatives to MemTest86+
Hard Disk Sentinel monitors, diagnoses, tests, and reports on storage health, performance decline, and failures.
smartmontools is a free package containing smartctl and smartd for controlling and monitoring storage devices through SMART.
- 4

GSmartControl
GSmartControl is a free desktop application for viewing drive health through smartctl, part of the smartmontools package.
Free planLinuxmacOSWindows6.7Free plan - 5

Speccy
Speccy is a Windows tool that summarizes PC hardware and provides detailed system information.
Free planWindows6.7$19.95 one-time - 6
Intel VTune Profiler
Intel VTune Profiler analyzes application and system performance to help developers locate bottlenecks across AI, HPC, cloud, IoT, media, and storage workloads.
Free planLinuxSelf-hostedWindows6.5Free plan - 7
HD Tune Pro
HD Tune Pro is a Windows utility for examining hard disks, SSDs, USB sticks, and memory card readers.
Windows6.4 - 8
stress-ng
stress-ng is a free tool for exercising computer hardware and operating system interfaces under load.
Free planAndroidLinuxmacOSSelf-hosted6.4Free plan - 9
PC-Doctor Toolbox
PC-Doctor Toolbox monitors Windows PC health and provides diagnostics, system information, history, troubleshooting, and monitoring tools.
Free planWebWindows6.3Free plan - 10
Prime95
Prime95 is free software for searching for Mersenne primes and contributing computing work to GIMPS, an international public project.
Free planLinuxmacOSSelf-hostedWindows6.3Free plan - 116.1Free plan
- 12
3DP Chip
3DP Chip is a free Windows utility that detects a computer’s CPU, motherboard, video card, sound card, and other components, then displays their information.
Free planWindows6.0Free plan - 13

Eurosoft Pc-Check
Eurosoft Pc-Check is a PC hardware diagnostic and stress-testing tool for manufacturing, servicing, repair, refurbishing, and support work.
LinuxSelf-hostedWindows6.0 - 14
HDAT2
HDAT2 is a free diagnostic program for ATA, ATAPI, SATA, NVMe, SSD and SCSI/USB devices.
Free planWindows6.0Free plan - 15

HDDScan
HDDScan is free Windows software for diagnosing hard drives, RAID arrays, USB flash drives, and SSDs.
Free planWindows6.0Free plan - 16
Ultimate Boot CD
Ultimate Boot CD (UBCD) gathers floppy-based diagnostic utilities on a bootable CD image.
Free planLinuxSelf-hostedWindows6.0Free plan - 175.9Free plan
- 18
MemTest64
MemTest64 is a free Windows utility for checking system memory for hardware-level problems.
Free planWindows5.8Free plan - 19
BurnInTest
LinuxWindows5.7From $58 a year - 20
HP PC Hardware Diagnostics
HP PC Hardware Diagnostics is a set of tools for testing computer components and identifying hardware failures.
Windows5.5 - 21
Karhu RAM Test
Karhu RAM Test is a paid Windows memory stress-testing tool designed to detect faulty hardware and instability from overclocking.
Windows5.5 - 22
HardInfo2
HardInfo2 is a free, GPL2+ open-source system information and benchmark program for Linux.
Linux5.3 - 23
CrystalDiskInfo
Windows4.7 - 24
PassMark DiskCheckup
Windows4.7 - 254.3