SimplyBar
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https://github.com/user-attachments/assets/f5201cb8-1857-4e28-ada7-00c3b93f18bb
See it in action in 29 seconds, with sound.
A free and open source system monitor for the macOS menu bar. SimplyBar shows CPU, memory, GPU, network, disk
and Bluetooth battery levels at a glance, checks how your Mac is doing in one click, keeps it awake when you
need it, and adds ten widgets to your desktop.
Highlights
- Free, for good. No ads, no account, no subscription, no in-app purchase. MIT licensed.
- Open source. Every line that runs on your Mac is in this repository.
- Private by design. Runs in the App Sandbox with no network access. Nothing is collected, nothing leaves your Mac,
and that includes the AI diagnostic, which runs on the Mac itself.
- Ten desktop widgets. CPU, RAM, GPU, Network, SSD, Storage for every disk, Bluetooth battery, Mac Health,
plus two you can click: Diagnostic and Keep Awake.
- Light. A module you hide is not measured at all. Native Swift and SwiftUI, no third-party dependency.
- 50 languages. The whole interface is translated.
New in 1.1
- Diagnostic. One click tells you whether your Mac is fine, worth watching, or has a problem, and why. On
macOS 26 or later with Apple Intelligence turned on, Apple's on-device model writes the explanation and you can
ask questions about your Mac. Elsewhere, built-in rules give the same verdict. Details below.
- Keep Awake. Stop your Mac from going to sleep, indefinitely or for 30 minutes, 1, 2 or 4 hours, with an option
to keep the display on too. Available from the menu bar and from a one-click widget.
- Mac Health. The heat level of your Mac and, on a laptop, its battery: charge, maximum capacity, cycle count
and condition.
- Alerts. Optional local notifications when a Bluetooth device runs low, the startup disk fills up, or the Mac
gets hot.
- Five new widgets. GPU, Bluetooth battery, Mac Health, Diagnostic and Keep Awake.
What it shows
Menu bar
Turn each module on or off, and choose what it displays and how (bar, percentage or gigabytes, depending on the module).
| Module | In the menu bar | In its popup | Shown by default |
|---|
| CPU | Total, user, system, idle, user + system, or one bar per core | Usage history, user, system and idle shares, usage per core | Yes |
| RAM | Total, apps, wired, compressed, or memory pressure | Usage history and the full breakdown of used memory | Yes |
| GPU | GPU usage | Usage history, titled with the GPU model | Yes |
| Network | Upload, download, both, or the local IP address | Upload and download speeds, history, local IP address (one click to copy) | Yes |
| SSD | Total, free or used space of the startup disk | History of the space used, then total, used and free space | Yes |
| Bluetooth | Battery of your connected devices | Every connected device, with its battery level when macOS reports one | No |
| Health | A thermometer that turns yellow, orange or red as the Mac heats up | Heat level (normal, warm, hot, critical), advice when it runs hot, and the battery section on a laptop | No |
| Diagnostic | A stethoscope | The verdict card, its buttons, and questions about your Mac | Yes |
| Keep Awake | A cup, full while it is on | On/off switch, duration, "Keep the display on too", time left | Yes |
Diagnostic
The Diagnostic module reads a snapshot of the Mac (processor, memory, GPU, disks, heat, batteries, Bluetooth
devices, network, time since the last restart) and gives a verdict: OK, Worth watching or Problem,
with a title, two sentences and up to three buttons that take you to the right place (Activity Monitor, storage
or battery settings, the Alerts tab, or Keep Awake for one hour).
It works in layers, so it always answers:
- Rules, on every Mac (macOS 14 or later). Built-in rules set the verdict, the title and the allowed buttons.
They need no AI and are translated into the 50 languages of the app.
- Apple's on-device model, when available. On macOS 26 or later, with Apple Intelligence turned on and in a
language it supports, Apple's on-device language model writes the two sentences and suggests the buttons. The
card then reads "Written on this Mac by Apple's on-device AI. Nothing leaves your Mac." and the widget shows a
small "AI" mark.
- A check on everything the model writes. Its text is shown only after it passes: same verdict as the rules,
buttons from a fixed list whose condition is true, and no number that is not in the snapshot. If anything
fails, or the model is busy, turned off or missing, you get the rules card instead.
With Apple Intelligence, Ask a question lets you chat about your Mac ("Why is my Mac slow?"). The model can
only read the same measurements, through read-only tools, one request at a time. Nothing is sent to a server:
SimplyBar uses only the on-device model, never Private Cloud Compute, and has no network access at all.
Alerts
All alerts are off by default. macOS asks for permission to send notifications the first time you turn one on.
| Alert | Sent when | Comes back after |
|---|
| Bluetooth battery | A device drops to 20% or less | It is back to 25% |
| Startup disk | Less than 10% of the disk is free | 12% is free again |
| Mac heat | The Mac is hot, then again if it becomes critical | It is back to normal or warm |
Each alert is sent at most once an hour.
This is the beginning of the README. Read the rest at the original. Read the full README ↗
