Support

Found a bug, missing a sensor, or have a feature request? Email caliper@klimakov.me or open an issue on GitHub — both get read.

Frequently asked questions

What does Caliper need to run?

macOS 15 or later on Apple Silicon. No admin rights, no kernel extensions and no privileged helper: Caliper reads what it needs as your user.

How do I install it?

Download the disk image, open it and drag Caliper to Applications. The build is signed with a Developer ID and notarized by Apple, so it opens without a warning.

Why isn’t Caliper on the App Store?

The App Store requires sandboxing, and the sandbox blocks the interfaces a monitor needs to read temperatures and fan speeds. Caliper ships as a notarized direct download instead — the same signing and notarization checks apply, without giving up the sensors.

How do updates work?

Caliper checks for new versions on a schedule. When one exists, it marks the menu bar instead of interrupting you; the update installs through Sparkle after its signature is verified against the developer’s key. You can also grab any version from the releases page.

A sensor or fan is missing. Is that a bug?

Usually not. Macs differ in which sensors they expose, so Caliper probes at launch and shows what this machine will actually report. What a Mac won’t report is hidden rather than guessed at. If a reading exists in another tool but not in Caliper, that’s worth an email.

How much does it cost to run?

Under 1 % of one core and under 50 MB of memory in menu-bar-only use. A measurement harness runs a release build for thirty minutes and reports both figures, so the budget is checked rather than assumed.

How do I uninstall it completely?

Quit Caliper and delete it from Applications. Two things live outside the app: the recorded history, in ~/Library/Group Containers/GCCNH99PN6.caliper, and your settings, in ~/Library/Preferences/com.olegklimakov.caliper.plist. Delete both and nothing is left behind. See the Privacy Policy for what each one holds.

Contact

Email: caliper@klimakov.me