SpeedFan
Free
SpeedFan is a program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips.
HWiNFO (32/64)
Free
Hardware Info (HWiNFO) is a powerful system information utility designed especially for detection of hardware.
Core Temp
Free
Core Temp is a compact, no fuss, small footprint, yet powerful program to monitor processor temperature and other vital information.
Informer
Commercial
Informer is an iPhone and iPad utility app to see device details.
Real Temp
Free
Real Temp is a temperature monitoring program designed for all Intel processors.
Sidebar Diagnostics
Open Source
SidebarDiagnostics is a simple sidebar for Windows desktop that displays hardware diagnostic information.
Open Hardware Monitor
Open Source
Open Hardware Monitor is a free open source software that monitors temperature sensors, fan speeds, voltages, load and clock speed.
MSI Afterburner
Free
MSI Afterburner is a graphics card overclocking utility which gives you full control of your graphics cards.
WinAudit
Open Source
WinAudit is an inventory utility for Windows computers. It creates a comprehensive report on a machine's configuration, hardware and software.
Atmonitor
Free
AtMonitor is an advanced monitoring tool for Mac OS X that displays system activity in real-time.
DriveDx
Commercial
DriveDx is an advanced drive health (S.M.A.R.T.) diagnostics and monitoring utility.
smcFanControl
Free
mcFanControl controls the fans of every Intel Mac to make it run cooler.
Compare iStat with alternatives
Compare Open Hardware Monitor and iStat and decide which is most suitable for you.
Compare HWiNFO (32/64) and iStat and decide which is most suitable for you.
Compare MSI Afterburner and iStat and decide which is most suitable for you.
Compare Sidebar Diagnostics and iStat and decide which is most suitable for you.
Compare smcFanControl and iStat and decide which is most suitable for you.