Rotating cat icon
Spin speed maps to real CPU/GPU activity. An idle machine means a resting cat; a render job sends it flying.
macOS menu bar app
A cat that spins with your Mac.
SpinCat lives in your menu bar. The busier your CPU and GPU get, the faster the cat spins. Click it for live CPU, GPU, memory, disk, and network — all measured locally, nothing phoned home.
macOS 13 Ventura or later · Universal (Apple silicon & Intel)
No Dock iconApp SandboxNo analytics
Everything in one tiny icon
Small footprint, plenty of signal
Live system popover
CPU, GPU, memory, disk, and network — each with its current value and the last 60 seconds charted.
Menu bar values
Pin any metric's number right in the menu bar and arrange the items in the order you want.
AI usage tracking
Optional quota tracking for ChatGPT, Claude, Cursor, Antigravity, and Copilot. Off until you turn it on.
Private by design
Local system APIs only. No sudo, no subprocess, no telemetry, no background network for system metrics.
Tuned to your taste
Sensitivity, rotation speed, a frame-rate cap, Reduce Motion support, and per-source device pickers.
How it works
Three steps, then forget it's there
1
Install & launch
SpinCat runs as a menu bar accessory — no Dock icon, no window in your way.
2
Watch it spin
CPU and GPU activity drive the animation in real time, so you feel load at a glance.
3
Dig into details
Click for charts and per-metric detail, or pin the exact numbers you care about.
Measured locally
Five system metrics, from the OS itself
Every reading comes from a first-party macOS API. No shelling out, no scraping, no elevated privileges.
- CPU
Mach host_processor_info tick deltas - GPU
IOKit IOAccelerator utilization keys - Memory
host_statistics64, pressure & swap - Disk
Volume capacity + IOKit byte counters - Network
Primary interface throughput via getifaddrs
Opt-in, off by default
Keep an eye on your AI quotas
SpinCat can surface plan usage for the AI tools you already pay for. It only reaches the network once you enable AI usage and pick a provider — and it never stores your tokens in the display cache.
ChatGPTClaudeCursorAntigravityCopilot
Credentials stay in app-managed local files or the Keychain. Quota requests run only when both AI usage and that provider are switched on.
Privacy
Your Mac's data stays on your Mac
System monitoring uses local APIs only. The only network access is the AI usage feature you explicitly enable.
Read the privacy details →Give your menu bar a cat.
Free, tiny, and private. See your Mac breathe.
macOS 13 Ventura or later · Universal (Apple silicon & Intel)