The deepest sensors,or the clearest answer.
iStat Menus has been a fixture on the Mac for years and still has the widest hardware sensor coverage of any monitor. MacStats is not trying to beat it on sensors. It is built for a different question: not what the numbers are, but what they mean.
iStat Menus
- The most comprehensive temperature and fan sensor coverage
- Very deep menu bar customisation
- Runs on Intel Macs as well as Apple silicon
- Long track record and active development
- Shows the readings, leaves the interpretation to you
- No per-process explanations
MacStats
- Plain-English explanation of what a process is doing (Pro)
- Alerts based on your own baseline, not a fixed threshold (Pro)
- Incident recording, so a slowdown is still there an hour later (Pro)
- One-time payment, no subscription option to think about
- Apple silicon only, macOS 13 or later
- Thermal state rather than individual sensors or fan RPM
Details for other apps reflect their publicly documented capabilities and may change between releases, so check their own sites for what is current. MacStats is not affiliated with them. The full three-way table is on the comparison overview.
What the numbers actually say
This Mac has 16GB of physical RAM and is currently holding 11.7GB of it, which leaves roughly 4.32GB free and only 0.18GB pushed out to swap. That swap figure is the important one. macOS only leans on the swap file once it has genuinely run short of clean pages, so 178MB of swap on a 16GB machine is background noise, not a signal of pressure.
Why nothing here is a problem
The single heaviest process is Google Chrome at 375MB, followed by one of its helpers at 144MB and two renderers at 245MB and 187MB. For a Chromium browser with multiple tabs and extensions, that is a modest footprint, not a leak.
Available RAM above 4GB on a 16GB machine is a healthy buffer. A system under real pressure would show this number under 1GB, swap in the multiple gigabytes, and pressure reported as warning or critical.
Recommended Actions
- No action neededWith 4.32GB free, 0.18GB of swap, and pressure reported as normal, the system is well inside its limits and any change would be cosmetic.
- Recheck the Memory tab if free RAM falls below 1GBThat is the threshold where macOS begins compressing and swapping noticeably, and it is the point at which quitting an app is genuinely worthwhile.
297 of 300 AI explanations left this month
If you want sensors, buy iStat. If you want answers, try this.
Download MacStats freemacOS 13 Ventura or later · Apple silicon · No subscription