AppWrangler

io.github.IntarsOv1.4.1Updated Oct 9, 2026

Per-app CPU, efficiency-core and memory control for Apple Silicon Macs, with suggestions and undo.

VerifiedSTDIODesktop onlyDeveloper ToolsProductivity & Workflow

Overview

AI-generated overview

Lets an assistant inspect and tune per-app CPU, efficiency-core and memory settings on Apple Silicon Macs, with suggestions and undo.

What it does
AppWrangler is a macOS menu bar utility for Apple Silicon Macs that manages CPU, efficiency cores and memory per app. Through MCP, an assistant can ask what is slowing the Mac down and apply fixes with the user's approval, using per-app CPU limits, efficiency-core-only mode, memory limits, freeze/quit actions, suggestions and undo. It also exposes command-line style operations such as showing an app, setting a rule, and reading stats.
When to use it
Worth adding when the user runs an Apple Silicon Mac and wants an assistant to diagnose performance or memory pressure and adjust per-app limits, rather than doing it by hand in the menu bar app.
Requirements
macOS 13 or later on Apple Silicon; the AppWrangler app installed locally (for example via Homebrew or the release zip) and the MCP integration set up, for example with the app's mcp install command. Runs as a local stdio process; no accounts, API keys or network access are declared.
Before you install
The server can change system behavior: it applies CPU and memory limits, moves apps to efficiency cores, and can freeze, quit or force-quit applications, which may interrupt work or lose unsaved data. Changes are meant to be confirmed by the user and can be undone. The app is not notarized, so macOS requires a right-click Open on first launch.

Installation

In SourceWeft

  1. Open AppWrangler in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

[AppWrangler icon]

AppWrangler

Keep every app on your Mac in check — CPU, efficiency cores and memory, per app.
A free, open-source menu bar app for Apple Silicon Macs.

[macOS 13+] [Apple Silicon] [GPL-2.0]

[Buy Me a Coffee]

Helps the app you're using stay fast, even on an 8 GB Mac with lots of apps open.

  • 🪄 Works on its own. Auto mode keeps the app in front at full speed and moves everything in the background to the efficiency cores. No rules needed.
  • 🧊 Rescues low-memory Macs. When memory runs short, it can freeze the apps you haven't touched for a while, and each one wakes the moment you click it. It also tells you which app is eating your RAM and what to do about it.
  • 🎛 Puts you in charge when you want it. Per-app CPU limits, efficiency cores and memory limits, with conditions such as "only on battery". You can also ask Claude to tune your Mac for you.

Free and open source (GPL-2.0), for macOS 13+ on Apple Silicon. It uses well under 1% of one core and never connects to the network.

bash
brew tap intarso/appwrangler https://github.com/IntarsO/AppWranglerbrew install --cask appwrangler

Or download the zip from Releases. AppWrangler isn't notarized yet, so the first time, right-click it → Open.

[The AppWrangler panel: CPU and memory meters, Auto mode status, suggestions, and running apps with what Auto is doing to each]

What it does

🪄 Auto modeOn by default. The app you're using runs at full speed. Background apps move to efficiency cores, and only when your Mac is busy do they share the CPU fairly, so everything stays usable. Optionally, when memory runs out, it freezes apps you haven't used for a while, and they resume the moment you switch back.
🎛 CPU limitCap an app and all of its helper processes (Chrome tabs, Electron helpers, Safari web content…) at any share of the CPU. Optionally limit it only while it's in the background.
🍃 Efficiency cores onlyMove an app onto the Apple Silicon E-cores, with slower disk and network access. It stays usable while saving battery and heat.
🧠 Memory limitWhen an app's memory stays above your limit, get notified, or freeze, quit or force-quit it. (macOS doesn't let one app hard-cap another's memory, so AppWrangler watches and acts.)
🚨 Low-memory protectionWhen your Mac runs short of memory, automatically freeze or quit apps you've marked as expendable, and resume them afterwards. Free memory now does it on demand.
⏱ ConditionsMake any rule apply only on battery or on the charger, in Low Power Mode, when the Mac is hot, or during set hours and days.
🔥 Runaway alerts"Chrome Helper has used 150% CPU for 3 minutes" — an alert in the panel and a notification with Limit, E-cores and Ignore buttons.
❄️ Freeze, quit, force quitSuspend any app instantly and resume it later.
📊 ImpactHow much CPU time and energy it saved, how often your Mac ran short of memory and how much it swapped, and what AppWrangler itself cost to run.
💡 Suggestions"Brave uses more than your 8 GB of RAM — here's what to do." Concrete recommendations, each with the reason, the benefit and a one-click fix. appwrangler undo takes changes back.
🤖 AI assistants (MCP)Ask Claude or OpenAI Codex what's slowing your Mac down and have it fix it, with your OK. Set up with one command: appwrangler mcp install.
⌨️ Command line & linksappwrangler suggest, show Slack, set Slack efficiency_cores=on, stats, prefs… and appwrangler:// links for Shortcuts.
🖥 Desktop widgetCPU, memory, Auto mode, the busiest apps and suggestions on your desktop (macOS 14+), with Pause, Auto and Free memory buttons.
📖 Built-in helpThe full manual inside the app, searchable and offline, with a ? next to every setting.

[Medium desktop widget: CPU and memory rings, Auto status, the busiest apps, the top suggestion and buttons]   [The built-in Help window showing the User Manual's Auto mode chapter, with topics and search in the sidebar]

How it compares

AppWranglerApp TamerAppPoliceActivity Monitor
PriceFree$14.95 (15-day trial)FreeFree (built in)
Apple Silicon native✅✅❌ (2016, Intel-era)✅
Move apps to efficiency cores✅✅❌❌
Per-app CPU limit✅✅✅❌
Per-app memory limit (notify / freeze / quit)✅❌❌❌
Automatic background management✅ Auto mode✅❌❌
Freeze idle apps when memory runs low✅❌❌❌
AI assistants (MCP) / command line✅ / ✅❌ / AppleScript❌❌
Open source✅ GPL-2.0❌✅ GPL-2.0❌
Last updated20262024 (2.8.4); 3.0 in beta2016with macOS

App Tamer is a polished, long-standing commercial app, and if you already use it, it does its job well. AppWrangler is for people who want something free and open source with memory handling and AI control. Facts checked in October 2026 against each project's own pages; tell us if something has changed.

Get started

  1. Install with Homebrew (above), the zip from Releases, or build it with Apple's free Command Line Tools: ./build.sh --install --run.
  2. Click the lasso icon in the menu bar. Auto mode is already working; the Auto line shows what it's doing, and Suggestions point out anything worth changing.
  3. Want more control? Click an app and turn on Limit CPU, Efficiency cores only or Memory limit. It applies at once and every time the app runs.

👉 Read the full Getting Started guide.

Documentation

Built on AppPolice

AppWrangler is a fork of AppPolice by Maksym Stefanchuk (2013–2015), a menu bar app that let you throttle an app's CPU with a slider. That project inspired AppWrangler, and its source is where AppWrangler began.

The original no longer built on modern macOS and its limiter didn't work on Apple Silicon. AppWrangler is a ground-up rewrite (Swift + C) that keeps the idea and adds:

  • an Apple Silicon–correct real-time CPU limiter that covers helper processes;
  • efficiency-core mode;
  • memory limits and low-memory protection;
  • conditional rules;
  • runaway detection;
  • "what is this?" descriptions;
  • a CLI;
  • a test suite.

See NOTICE.md and the CHANGELOG for details. AppPolice 1.x limits and AppPolice 2.x rules are imported automatically.

Support the project

AppWrangler is free and always will be. If it saves your battery or your sanity, you can buy me a coffee ☕. Thank you!

Building and contributing

bash
xcode-select --install     # Command Line Tools — full Xcode is not required./build.sh                 # → build/AppWrangler.app./test.sh                  # unit + integration tests./Tests/e2e/run.sh         # end-to-end tests against the built app

Contributions are welcome — see CONTRIBUTING.md and our Code of Conduct. Please report security issues privately as described in SECURITY.md.

License

AppWrangler is free software, licensed under the GNU General Public License v2 (LICENSE), the same license as AppPolice. Original AppPolice code © 2013–2015 Maksym Stefanchuk; AppWrangler © 2026 AppWrangler contributors.

Source: README.md at commit c582048

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Version history

1
  1. v1.4.1LatestOct 9, 2026