System Monitor – live CPU, RAM, network & temperatures in your tray
A tiny Windows tray app that watches your PC in real time: CPU, RAM, network speed and CPU/GPU temperature – with alerts when things get hot.
Free forever | Open source (MIT) | No tracking, no ads | Windows 10/11
Know what your PC is doing
All the important numbers, always one glance away – without opening Task Manager.
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Live stats in your tray
CPU, RAM, network speed and temperature shown right next to the clock.
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Temperature alerts
Know the moment your CPU or GPU gets hot – with desktop notifications.
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Config file, not settings zoo
All options live in a simple config file at %APPDATA%\SystemMonitor.
What you get
Built to stay out of your way and never slow your PC down.
- Live CPU usage
- Live RAM usage
- Network speed in MB/s
- CPU & GPU temperature
- Toast alerts on high temps
- Color-coded tray icon
Why you can trust it
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Truly open source
MIT licensed on GitHub. Read the source and see exactly what it measures.
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Private by design
Everything stays on your PC. No accounts, no telemetry, no cloud.
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Tiny footprint
A lightweight tray app that uses almost no resources while it watches.
Frequently asked questions
Is System Monitor really free?
Yes – free forever and open source under the MIT license, with no premium tier and no paid features.
How do I change the settings?
All settings live in a simple config file at %APPDATA%\SystemMonitor\config.json – easy to edit, easy to back up.
Does it need administrator rights?
No. It runs happily in the system tray without admin rights.
Does it upload anything?
No. It is fully offline and never sends anything anywhere.
Watch your PC, stay in control
Download, run it, and the numbers are right there in your tray.
Want to clean up your disk too? Check out PC Cleaner – one-click junk removal that keeps your passwords and history safe.