DevLune · SysWatch · Download and setup
Your PC's stats, live on your phone.
SysWatch shows your computer's CPU, GPU, memory and more on your phone. It has two parts: the desktop app on the PC you want to watch, and the Android app on your phone. Install the desktop app first, then pair the phone. This page walks you through all of it.
Everything SysWatch does, with screens and answers to common questions, is on its own website: syswatch.devlune.in. How it was built is at devlune.in/syswatch.
Desktop app
Download for Windows
Version 0.3.0 · Windows 10 / 11, 64-bit · about 3.5 MB
The button downloads the installer straight away. The file is hosted on GitHub and is named SysWatch_0.3.0_x64-setup.exe. The installer is not code signed yet, so Windows shows a warning the first time. The install steps below get you past it.
Windows today. There are no Linux or macOS builds.
Then get the phone app
Get SysWatch for Android on Google PlayInstall
Install it on Windows
- Download the file ending in
-setup.exeand run it. - Windows SmartScreen may say "Windows protected your PC". Choose More info, then Run anyway. This appears because the installer is not code signed yet.
- Finish the installer and open SysWatch. It lives in the system tray, the row of small icons next to the clock.
- Pick how your phone connects (Local, Cloud by DevLune or Tailscale), then open Pairing to show the QR code.
Connection
Choose how your phone connects
| Local | Cloud by DevLune | Tailscale | |
|---|---|---|---|
| Works from | The same Wi-Fi | Anywhere with internet | Anywhere |
| Set up | Nothing | Nothing | About five minutes, once |
| Speed | Instant, straight from the PC | About 2 seconds per update | Instant, straight from the PC |
| Where readings go | Never leave your network | Through DevLune's relay | Through your own private Tailscale link |
The desktop app asks this the first time it opens, with the steps for each choice. Not sure? Pick Local if the phone sits near the PC. You can change it later in Settings. Full guides: install and Tailscale.
Local mode uses one port, 47800. The first time, Windows Firewall asks whether to allow SysWatch on private networks: choose Allow.
Local mode needs version 1.1.0 of the Android app, which is not on Google Play yet as of 10 Nov 2026. Until it is, use Cloud mode.
Pairing
Pair your phone
- Install SysWatch from Google Play and open it.
- On the PC, open Pairing. A QR code and a 6-character code appear.
- On the phone, tap Scan the code on your PC and point it at the QR.
That is all. The QR carries the mode, the address and the port, so there is nothing to type.
Away from home
Use it away from home with Tailscale
Tailscale gives your PC and phone a private, encrypted link that works from anywhere, as if they were on the same Wi-Fi. With it, local mode works away from home: instant updates, nothing sent through the SysWatch cloud. Tailscale is a separate product with a free personal plan. SysWatch does not include it and does not need your Tailscale password.
Set up, about five minutes
- PC: install Tailscale from tailscale.com/download and sign in.
- Phone: install Tailscale from Google Play and sign in with the same account.
- Check both show Connected in Tailscale. Each device now has an address that starts with
100. - SysWatch on the PC: choose Tailscale on the first run, or in Settings.
- Open Pairing. Under addresses you should see one labelled Tailscale.
- SysWatch on the phone: scan the QR code.
Done. At home the phone uses your Wi-Fi address. Away from home, with Tailscale on, it switches to the Tailscale address by itself.
Good to know
- Keep Tailscale switched on on the phone when you are out. If it is off, SysWatch shows "PC not reachable" until you turn it back on.
- On Android, Tailscale counts as the phone's VPN. Only one VPN can run at a time.
- If you already paired before installing Tailscale, scan the QR again so the phone learns the Tailscale address.
- No Tailscale address in the Pairing screen? Tailscale is not connected on the PC. Open it from the tray and sign in, then reopen Pairing.
- The PC must be awake. Tailscale cannot reach a sleeping computer.
Troubleshooting
If it does not connect
- "PC not reachable" in local mode
- Phone and PC are on the same Wi-Fi (not guest Wi-Fi, which isolates devices). Windows Firewall allowed SysWatch. The desktop app is running.
- Connects at home, not outside
- Local mode needs Tailscale away from home. See the Tailscale steps above.
- "Code not found"
- The PC made a new code. Open Pairing on the PC and scan again.
- Stuck on "Paused"
- The desktop app is paused. Open it and press Resume.
- Port already in use
- Change the port in desktop Settings, then scan the new QR.
Still stuck? Email sidharth@devlune.in.
Privacy and safety
What leaves your PC
Local mode is not encrypted on your network, and the 6-character pairing code is the only lock. Use it on networks you trust: your home Wi-Fi, or Tailscale, which encrypts everything itself.
Cloud by DevLune relays your stats through DevLune's relay so the phone can read them from anywhere.
The phone reads. The one exception: in Local and Tailscale mode it can play, pause and skip what your PC is playing, and you can switch that off on the PC. It cannot change or run anything else.
Crafted in the dark. Shipped to the world.
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