If you want live CPU, temperature, battery %, GPU, and RAM in the macOS menu bar — without a subscription or an account — rNitro is built for that.
Many people search for a free alternative to paid menubar monitors (for example iStat Menus). rNitro is not affiliated with those products. It is free software with local sensors, optional AI using your keys, and no product telemetry.
Developers, power users, and anyone who wants a lightweight, honest monitor without cloud lock-in. Builds are ad-hoc signed today — first open may need right-click → Open.
Official page (canonical):
Download rNitro GitHub Releases