Fanny
Fanny is a menu bar widget for macOS that displays real-time CPU and GPU temperature monitoring on Intel-based Macs. It sits in the system menu bar, showing temperature readings at a glance without taking up screen space. Fanny was popular among Mac users who wanted to keep tabs on their system's thermal performance to diagnose overheating issues or simply monitor hardware health during intensive tasks.
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1 suggestionFanny has been discontinued and is no longer supported by its developer. There is no native Apple Silicon build. The app will continue to run under Rosetta 2 on M-series Macs today, but Apple is removing Rosetta 2 in macOS 28 (September 2028), so Fanny will stop working entirely on that release. For Apple Silicon Macs, the community has moved to Hot, a free and actively maintained open-source app from iMazing that provides real-time CPU temperature monitoring in the menu bar and runs natively on M-series Macs. Hot is simpler than Fanny (it focuses on CPU temperature rather than GPU), but it covers the most common use case and is regularly updated. For users who need more detailed thermal data, the Terminal command "sudo powermetrics --samplers smc" can pull CPU temperature readings without any additional software.
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