Clusters, cores and GPU
Per-core bars grouped by cluster, read from the chip itself, with load average, uptime and thermal state underneath.
Occulii · v0.2.0 is out →
Your whole Mac.
One quiet eye.
Occulii is a menu bar system monitor. CPU, GPU, memory, network, disk and sensors live in one panel behind a single item, and any tile opens its full detail beside it. It does all that on a fraction of a percent of one core.
Signed & notarized · macOS 15+ · Apple Silicon
CPUGPUMemoryNetworkDiskSensorsNo accountNo telemetry
Read straight from macOS on your Mac. Nothing leaves it.
A monitor shouldn't be the thing using your Mac. Occulii samples everything from one timer, reads detail only while you're looking, and goes still when the display sleeps.
01Overview
One item, every detail
Hover a tile and its detail opens beside the panel. No row of six icons crowding your menu bar.
02Cadence
Tiered sampling
Fast readings every tick, slow ones less often, and process scans only while a panel that lists them is open.
03Idle cost
0.05% CPU
One menu bar item, panel closed
11MB
Memory footprint · M1 Pro
Measured, not promised
Release build, default settings, two-second refresh. It sleeps when your display does.
1.0 Processor
Every core,
not just an average
Apple Silicon splits work between performance and efficiency cores. Occulii shows each cluster and each core, user and system load as stacked history, GPU load beside it, and the processes doing the work.
Or give it its own item
CPU, Memory, Network, Disk and Sensors can each have a menu bar item in graph, value or glyph-only style.
2.0 Memory & network
Pressure, not
just percentages
“Used memory” on a Mac is mostly cache. Occulii leads with memory pressure, the number macOS itself acts on, then breaks down app, wired and compressed memory and swap. Network shows live throughput per direction with its own history.
Memory
Pressure with history, the composition bar, swap, and who's holding the most.
Network
Download and upload mirrored around one baseline, each active interface, and session totals.
3.0 Disk & sensors
Space, activity
and heat
See how much room is left on every local volume, what your disks are reading and writing right now, and which apps are doing it. Temperatures are grouped the way the chip is built, with fans and battery alongside.
Disk
Free space on every local volume, read and write rates with history, and bytes moved since boot.
Sensors
Core, GPU, SSD and battery temperatures with status, fan speeds, and battery charge and cycles.
4.0 Details
Small, native,
and out of the way
Occulii is a native AppKit app with no helpers, daemons or kernel extensions. It lives in the menu bar, not the Dock.
AppearanceSystemLightDark
Refresh1 s2 s5 s
Temperature°C°F
Accent
Launch at login
A short settings list
Which items show and how, appearance, refresh interval, temperature unit, accent color and launch at login. That's it.
4.1
Hover or click
Panes open after a short hover pause, so the pointer can cross other tiles without flipping them. Click a tile to toggle its pane; Escape closes.
4.2
Status in words
Nominal, warm and hot always come with an icon and a label, never color alone.
4.3
Quiet menu bar
Items only redraw when what they show actually changes, and keep a steady width so neighbours don't jump.
4.4
Private by design
No account, no analytics, no network calls. Everything comes from macOS on your Mac.