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ChillMac
Free fan control and system monitor for your Mac
ChillMac is a free, open-source macOS menu bar app that puts fan control and live system monitoring one click from your menu bar. See real-time fan RPM, override fan speeds with manual sliders or Low/Medium/High/Max performance modes, and track CPU, memory, battery, disk, and temperature sensors in clean SwiftUI dashboards. Works on Apple Silicon and Intel Macs. Signed, notarized, and MIT licensed — no account, no telemetry, no paywalls.
Hey Product Hunt!
I built ChillMac because every time my MacBook started sounding like a hair dryer, I had
to bounce between iStat Menus, Macs Fan Control, and Activity Monitor to figure out what was actually going on. The Mac fan control apps I liked were either paid, abandoned, or both. So I built the one I wanted — free, open source, and focused.
ChillMac lives in your menu bar and gives you:
• Live fan RPM in the menu bar at a glance
• Per-fan manual speed sliders + Low/Medium/High/Max performance modes
• CPU monitor — usage graph, top consuming apps, temperature, uptime
• Memory monitor — donut chart, pressure, swap, top consumers
• Battery monitor — charge, health %, cycle count, temperature
• Disk monitor — storage by category (Apps, Downloads, Documents…) + SSD temp
• Color-coded temperature sensors for CPU, GPU, DRAM, SSD, battery, and more
• Apple Silicon and Intel support
• Auto-update via GitHub releases
Under the hood it's a two-process design: an unprivileged SwiftUI app reads SMC sensors directly via IOKit, and a tiny privileged helper (installed via SMAppService) handles fan writes over XPC after validating the caller's code signature. On Apple Silicon it uses SMC test mode to bypass thermalmonitord for manual control, with signal handlers that reset fans to auto on quit or crash. Hardened runtime, signed, notarized, stapled.
It's 100% free with no ads, no accounts, no telemetry, and the source is on GitHub under
MIT — fork it, hack on it, ship a PR. Download the DMG from the GitHub release, drag to Applications, and it appears in your menu bar.
Would love your feedback — especially which sensor or panel you'd want to see next, and whether the performance-mode curves feel right on your machine.
About ChillMac on Product Hunt
“Free fan control and system monitor for your Mac”
ChillMac was submitted on Product Hunt and earned 12 upvotes and 2 comments, placing #25 on the daily leaderboard. ChillMac is a free, open-source macOS menu bar app that puts fan control and live system monitoring one click from your menu bar. See real-time fan RPM, override fan speeds with manual sliders or Low/Medium/High/Max performance modes, and track CPU, memory, battery, disk, and temperature sensors in clean SwiftUI dashboards. Works on Apple Silicon and Intel Macs. Signed, notarized, and MIT licensed — no account, no telemetry, no paywalls.
On the analytics side, ChillMac competes within Mac, Open Source, Developer Tools and GitHub — topics that collectively have 725.5k followers on Product Hunt. The dashboard above tracks how ChillMac performed against the three products that launched closest to it on the same day.
Who hunted ChillMac?
ChillMac was hunted by Timothy Murphy. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of ChillMac including community comment highlights and product details, visit the product overview.
Timothy Murphy