Free and open source · Windows 10 and 11
Temperatures, fans, power and lights.
One calm window for your whole PC. Ember reads the sensors, runs your fans on quiet-to-extreme curves, measures what the wall socket sees, and lights your RGB gear. Nothing leaves your PC.
About
Ember started because PC control software is usually loud: bloated, cloud-linked and always asking for an account. This is one calm window that reads your sensors, runs your fans and lights your desk, and keeps everything on your own machine.
No accounts and no telemetry. The only network use is what you switch on, such as checking GitHub for an update.
Fan limits are enforced in a separate service. The app only displays and asks, so closing or crashing it never touches a fan.
MIT licensed and built in the open by one person, Ol775. Read the code, report a bug, or help test the betas.
Tour
Pick a page. The real site shows the recorded tour; this mockup draws it.
Switch between Super quiet and Extreme, or shape your own curve. Ember never lets a fan stop while the CPU is hot.
Stack effects, paint single LEDs and watch a live preview of every device before anything changes.
Your Steam, Epic, GOG, Ubisoft Connect and EA app libraries, with a last played line and a fan mode for each. The titles here are made up.
A read-only plug measures the whole PC. Ember takes away the CPU and GPU and shows you the rest, with a daily and monthly cost.
Dark, OLED black, light or match Windows. A warm, neutral or cool tint, nine accents, interface size, and where the window opens.
What it does
A small background service reads the sensors and writes fan speeds. The app only displays and asks.
Super quiet to Extreme in one click, with the safety limits always on.
A read-only smart plug shows what the whole PC draws, split into CPU, GPU and the rest, with a running cost. Ember never switches a plug.
Stack effects with blend modes, paint single LEDs, sync to music or your screen, and save scenes.
Ember reads your Steam, Epic, GOG, Ubisoft Connect and EA app libraries and switches modes when a game starts, even in a window.
Pick a theme, a tint and an accent. Every page of this site changes with you, and remembers it next time.
Schedule a mode, and get told when a part runs hot or a fan stops.
Live CPU and GPU temperature on a key.
How it works
Splitting the two keeps the window safe to open, close and crash. Only the service can touch a fan.
CPU, GPU, board and fan readings through LibreHardwareMonitor and the signed PawnIO driver.
Runs your curves, enforces the 90° override and the fan floors, and leaves fans safe if it stops.
The window you see. It never writes to hardware, and talks to the service over a local pipe.
Two builds
Both share the same look. They differ in how much has been proven on real hardware.
Safety
Fan speeds are written only by the service, only for headers you have tested and enabled.
On any source, every controlled fan goes to 100%. Released at 85°.
Floor for the CPU, and for the GPU fan. System fans never drop below 20%.
A missing or stale sensor sends the affected fans to full speed.
Bytes sent on its own. No accounts, no telemetry.
Roadmap
Plans can change. Most of what is left waits on real hardware, because a feature only leaves Beta once it has been tried on devices the author owns or testers report back on.
Live dashboard, five fan modes with the safety rules, header testing, the installer with terms, and a public repository after a safety audit.
The new look, Games, Power at the wall, lights through OpenRGB, Govee, Logitech, Hue and Corsair, scenes and fan curves as files, and a compact window.
Schedule and alerts, the Stream Deck plugin, GPU fan control, a lighting scene per game and global hotkeys. Switch on the Beta channel to try them.
Install
Needs Windows 10 or 11 (x64) and administrator rights. The installer adds .NET 8 if it is missing.
Get Ember-Setup-<version>.exe from the latest release. Betas are marked Pre-release.
Accept the Terms, follow the pages. It adds the services and a signed driver, checked before it runs. Windows shows an unknown publisher warning because the installer is not code-signed yet.
Open Fans, test a System Fan header, then enable it. Nothing is written to a fan header before you do.
Questions
Fan control has unit tests and has been checked on one real PC, and the safety rules above are enforced in the service. Test one header at a time and watch your temperatures.
It is built and tested on an MSI B550-A PRO. Other chips supported by LibreHardwareMonitor may work. The verification page lists what has been checked.
No. It only asks a plug what it is drawing.
Not on its own. The only network use is what you switch on, such as update checks against GitHub.
Not at the same time on the same devices. Ember warns you about fan-control programs by name and can close them.
Free, open source and local only. Download it, test one fan header, and watch the temperatures settle.