Bondi vs Activity Monitor, iStat Menus, Stats and Vitals

Bondi is a native macOS system monitor with on-device AI. It tells you why your Mac is slow, in one plain sentence. Here is how it compares with the four tools people most often use instead, checked against each app's own website.

The comparison

	Bondi	Activity Monitor	iStat Menus	Stats	Vitals
Tells you why your Mac is slow, in a plain sentence	Yes (on-device AI)	—	—	—	—
Explains what each macOS process is	Yes (125 processes)	—	—	—	—
Adds helper processes up into one row per app	Yes	Groups them, no totals	—	—	Yes
Dev servers, grouped by project	Yes	—	—	—	Yes
Local AI models (LM Studio, Ollama)	Yes	—	—	—	—
Fan control	Yes (Fan boost)	—	Yes	Yes	Yes
Lives in the menu bar	Yes	—	Yes	Yes	Yes
History	30 days	—	Not stated	Not stated	30 days
Price	$24.99 once ($9.99 for the first 250)	Free, built into macOS	$11.99 once	Free, open source	$29 once
Runs on	macOS 15 or later	Every Mac	macOS 11 or later	macOS 12 or later	macOS 15 or later

"—" means we couldn't find it on that app's own website (apple.com, bjango.com, github.com/exelban/stats and vitalsmac.com), checked on October 4, 2026. Spotted something out of date? Write to support@trybondi.app and we'll fix it.

Bondi

A native macOS system monitor with on-device AI. It groups about 1,000 processes into the apps you know, keeps 30 days of history on the Mac, and tells you in one sentence what's slowing the Mac down. The sentence is written on the Mac by Apple's on-device model (or a small free model on Macs without Apple Intelligence), and Bondi checks every figure in it. It also shows dev servers, Docker containers and local AI models with the memory each holds, and explains 125 macOS processes by name. No account, no analytics.

Choose Bondi if you want to know why your Mac is slow, not just see the numbers.

Activity Monitor

The task manager built into every Mac. It lists every process with its CPU, memory, energy, disk and network use, and it's where you force quit a stuck process. It doesn't keep history, add helper processes up into apps, or explain what it shows. More in Bondi vs Activity Monitor.

Choose Activity Monitor if you want a free, detailed list for a quick check.

iStat Menus

A long-running menu bar monitor by Bjango: CPU, GPU, memory, disks, network, sensors, battery and weather, with fan control where the Mac supports it. $11.99 once on the Mac App Store, with a 14-day trial on Bjango's website.

Choose iStat Menus if you want the most readings and sensors in your menu bar.

Stats

A free, open-source menu bar monitor (MIT license): CPU, GPU, memory, disk, network, battery, fans, sensors and Bluetooth. Its fan control is in legacy mode, according to its README.

Choose Stats if you want a free, open-source menu bar monitor.

Vitals

The closest to Bondi: it also groups processes into apps, keeps 30 days of history, finds dev servers by project, sets fan speed and controls each app's volume. $29 once. Its website doesn't mention plain-language explanations, notes on what processes are, or local AI models.

Choose Vitals if you want app-level grouping and history, without the AI explanations.

Questions

What is the best Activity Monitor alternative for Mac?

It depends on what you need. Bondi is an Activity Monitor alternative when you want a plain explanation of why your Mac is slow. For the most menu bar readings, iStat Menus. For free and open source, Stats. Activity Monitor itself stays useful for a detailed list of every process.

Is there a free alternative to iStat Menus?

Yes: Stats is free and open source, and shows CPU, GPU, memory, disk, network, battery, fans and sensors in the menu bar. Activity Monitor is also free, but it isn't a menu bar monitor.

What's the best system monitor for Mac?

For seeing every reading, iStat Menus or Stats. For understanding them, Bondi: it groups processes into apps, keeps 30 days of history and tells you in one sentence what's slowing the Mac down, with an AI that runs on the Mac.

What is the difference between Bondi and Vitals?

Both group processes into apps, keep 30 days of history and find dev servers. Bondi also tells you in a plain sentence why your Mac is slow, written by an on-device AI, explains 125 macOS processes by name, and shows local AI models such as LM Studio and Ollama.

Does Bondi replace Activity Monitor?

No. Bondi is an Activity Monitor alternative, and it works alongside Activity Monitor. Activity Monitor stays useful for a detailed list of every process; Bondi tells you which app is the problem and what to do about it.