The best alternatives to Taskbar stats are Istat Menus 6, Barsoom 2, and Stats. If these 3 options don't work for you, we've listed a few more alternatives below.
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iStat Menus covers a huge range of stats, including a CPU monitor, GPU, memory, network usage, disk usage, disk activity, date & time, battery and more. All in a highly optimised, low resource package. iStat Me...
Stats is an application that allows you to monitor your macOS system: - CPU utilization - GPU utilization - Memory usage - Disk utilization - Sensors information - Battery level - Network usage
StatusBuddy is a simple app that shows an icon on your Mac's menu bar. When an Apple service is having issues, the icon shows a red badge and you can click it to check what's going on.