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Which app is slowing your Mac down?

Wisp is a free, open-source system monitor for macOS. It groups processes by app and shows what each app uses: CPU, memory, GPU, power, disk and network.

Download for Mac Source on GitHub
Wisp's Overview window: cards for CPU at 48 percent, memory at 31 of 36 GB, GPU, disk, network, power and temperature, a Developer card with coding agents, and a Worth a Look list

Overview

CPU, memory, GPU, disk, network, power and temperature, each with the last few minutes, hour or day. Why Is It Slow? names what is holding the Mac back.

Apps

Processes are grouped under the app that owns them. Its drawer shows the browser tabs, GPU process and extensions inside, its GPU time and last hour, and Quit or Force Quit.

Wisp's CPU page with the drawer for Google Chrome open: 16 GB of memory, 229.6 percent CPU, and a breakdown showing tabs use 91 percent of its memory

Menu bar

Show CPU, memory, network, disk, GPU, temperature, power or battery as text or a small graph. Click it for a dashboard with every core and the busiest apps.

Wisp's menu bar dashboard: CPU at 43 percent, meters for memory, GPU, power, network, disk and battery, a heat map of 14 cores and the five busiest apps

Performance

Menu bar only, measured side by side on the same M3 Max over the same 90 seconds

CPU

0.4%

Of one core, about half of what Vitals uses

  • Wisp0.42%
  • Vitals0.83%

Memory

19MB

About a twelfth of what Vitals uses

  • Wisp19 MB
  • Vitals238 MB

With a window open, Wisp uses about 3% CPU and 50 to 60 MB, Vitals 5 to 6% and 245 to 450 MB

Pages

A page for every part of the Mac, and for the dev servers, containers and coding agents you leave running.

Coding Agents

Claude Code, Codex, Gemini CLI and more: the folder each one works in, its CPU and memory, and your plan limits if you turn them on.

Wisp's Coding Agents page: 12 agents running using 45.2 percent CPU and 3.6 GB, with a list of Claude Code and Codex sessions

Every part of the machine

Each part gets a page with a live, hour and day chart.

  • CPU48%
  • Memory31 GB
  • GPU42%
  • Neural EngineIdle
  • Power14 W
  • Disk41 MB/s
  • Network20 KB/s

Plus Sound, Bluetooth and Sensors.

Projects and containers

Dev servers and their ports, with idle ones marked. Docker, OrbStack and Colima containers too, without the CLI.

Alerts

A notification when an app uses a full core for minutes or keeps growing in memory.

CLI and MCP server

Read the same numbers from Terminal, or hand them to your coding agent.

Free and open source

MIT licensed. Wisp doesn't run anything as root and keeps a year of per-app history on your Mac.

Download for Mac Source on GitHub

macOS 15 or later on Apple silicon, best on macOS 26