iStat Menus is described as 'IStat is a series of system monitor apps. It's available in different versions: iStat Menus, iStat for iOS and iStat Server as a companion application to the iStat for iOS app that lets you remotely monitor your computers (free for Windows and Mac)' and is a very popular system information utility in the system & hardware category. There are more than 50 alternatives to iStat Menus for a variety of platforms, including Mac, Windows, Linux, iPhone and iPad apps. The best iStat Menus alternative is HWiNFO (32/64). It's not free, so if you're looking for a free alternative, you could try HWiNFO (32/64) or Open Hardware Monitor. Other great apps like iStat Menus are MSI Afterburner, SpeedFan, Sidebar Diagnostics and Core Temp.
The BitBar app lets you put the output from any script or program right in your Mac OS X menu bar. And it's completely free. An impressive number of plugins have already been contributed by a wide range of developers just like you, and this site makes it easy to find them.
iStatistica is an advanced system monitor for macOS and iOS. It includes notification center widget and menu bar popover / monitoring dashboard. Simply slide out notification center to keep an eye on your CPU, memory, disk usage, network activity, sensors and fans data.
iStatistica is the most popular iPhone & iPad alternative to iStat Menus.
iGlance is a small system monitor that displays current stats about your Mac on the menu bar. It is built to be highly customizable so that everyone can adjust it to his/her needs. A full list of all the features is below.
Monitor and control fans on Apple computers with a simple and efficient user interface
The xbar app lets you put the output from any script or program right in your macOS menu bar. And it's completely free. An impressive number of plugins have already been contributed by a wide range of developers, and this site makes it easy to find them.
Mac OS X System Monitor and Process Explorer Tool atMonitor is the most advanced monitoring tool for Mac OS X that displays system activity in real-time. It is designed to allow quick assessment of computers state and it is powerful enough to make it a core utility in anyones sys.
Professional System Monitoring Utility designed for Mac.
xScan has been specifically designed to help you monitor the behavior and health of your Mac in a simple and straightforward manner. This is done in real time. No more needing to go ‘beneath the hood’ to find out all those.
XRG is an open source system monitor for Mac OS X. XRG allows you to monitor CPU activity, memory usage, battery status, machine temperature, network activity, disk I/O, current weather, and stock market data.
Most users think MenuMeters for El Capitan is a great iStat Menus alternative.
DriveDx is advanced drive health diagnostic and monitoring utility. Unlike most drive utilities, DriveDx does not only monitor the drive’s built-in S.M.A.R.T. status, but also analyzes the changes of all drive health indicators that are closely related to HDD or SSD failures...
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simple, free, opensource, no fuss.