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Heat Watch
Know why your Mac is running hot
What's new in v1.0.5
- Why is my Mac hot? A plain-language verdict at the top of Overview: heavy computing on every core, a few cores flat out, graphics, memory, a full disk or heat that isn't from load. It names the busiest app and gives tips that fit.
- Heat events: every time macOS reports the Mac as warm or hot, Heat Watch logs the cause, CPU and GPU load, the app in front, and whether it was charging. Find it under the Heat tile. Saved on this Mac only.
- Why is my battery draining? On battery, the Battery tile explains the cause (graphics, CPU, apps keeping the Mac awake, network or screen) with tips. Hover the menu-bar item for a short cause such as "GPU-heavy".
- Heat culprits now compare this week with last: for each app that was on top while macOS slowed the Mac, you see the change in minutes. App history is kept for 30 days.
- Day by day: pick any day of the last 90 and see its CPU and GPU by hour, the warm and hot hours, and a 30-day chart of heat. It also flags hours far above your usual load. Under the Heat tile.
- Heat alerts now say why, with a tip. Heat events also show repeating patterns (time of day, charging, usual cause) and how long past warm spells took to cool down.
- New "Play a sound" switch under Alerts: turn it off to keep seeing alerts, silently.
Trouble with Heat Watch? Get support
Your Mac is hot and the fans are loud — but why? Heat Watch sits in the menu bar, keeps an eye on every app, and taps you on the shoulder when one of them has been working the Mac hard for a while. The alert names the app and explains, in plain language, what it is and what to do about it.
Example: “Android Emulator is working your Mac hard — using 8.5 of 12 cores for 2+ min. A virtual Android device is busy. Close it, or give it fewer CPU cores in Device Manager.”
Both editions side by side, with what each one can do: the Heat Watch editions.
Screenshots
Features
- Menu bar meter Chip temperature, CPU and GPU use at a glance. The icon turns into an orange flame when something is hot.
- Sustained-load alerts One app above 2, 4, 6 or 8 cores for two minutes — short spikes are ignored.
- Thermal alerts When macOS starts slowing the Mac down to cool it, Heat Watch tells you the biggest cause.
- Plain-language reasons Android Emulator, Spotlight indexing, compilers, Gradle, Docker, Time Machine, Photos analysis, browsers and more.
- Busiest apps Helper processes are grouped under their app, so “Chrome” means all of Chrome.
- Power and history Per-app power use and graphs, plus charts of how hot and busy the Mac has been.
- Quiet when you want Pause alerts for an hour, choose your threshold, open at login.
- Featherweight Uses close to 0% CPU itself. No accounts, no network, no tracking.
Prefer the Mac App Store? Heat Watch Lite is coming soon: the menu bar meter, alerts and charts in a sandboxed edition, without chip temperature or per-app figures.