Horizon Labs serves its HUD as an ordinary web page, so a second screen can be a browser window on another monitor of the same PC, or a browser on another device on your network once LAN mode is on. The overlay can also be placed on a chosen display.
How it works
Horizon Labs runs a small web server for the overlay. By default it only answers the PC itself (127.0.0.1, port 8088). With LAN mode on, any device on your network that can reach the PC’s address and port can open the page, and the live data follows over the same connection. Only Horizon Labs needs Windows 10 or 11; the screen showing the page just needs a modern browser. For a second Windows PC, see HUD on a second PC.
Tablets and phones work in LAN mode, whatever their system, and so do console games that export telemetry: the console sends its data to the PC, and the tablet shows the HUD. Very old or low-power devices may draw the HUD less smoothly, so try yours before a race.
Option 1: a second monitor on the same PC
There are two ways to do this.
Move the overlay to the other display
In Horizon Labs settings, the overlay section has a Display list. Each entry shows the monitor’s name, resolution, aspect ratio and Windows scaling, and marks the primary one. Pick the other monitor and the overlay window moves there. That puts the on-screen overlay on your second screen, which suits a dashboard monitor next to your main one while the game runs full screen on the first.
Open the page in a browser window
- In Horizon Labs settings, set Display mode to OBS (browser source) or Both. The page now shows the URL, by default
http://127.0.0.1:8088/overlay/index.html. - Open that address in a browser window and drag it to the second monitor.
- Press F11 for full-screen. The page background is transparent, so the browser’s own page colour shows behind the HUD.
No LAN mode is needed on the same PC. Choose a matching OBS canvas resolution, which includes 1280×720, 1080p, 1440p, 4K, ultrawide and 1080×1920 portrait, so the HUD lays out for your monitor’s shape.
Option 2: a tablet, phone or laptop on your network
- On the gaming PC, set Display mode to OBS (browser source) or Both, then tick Allow OBS on local network (LAN).
- Horizon Labs shows a line starting “LAN (same Wi-Fi)” with the address to use, in the form
http://<PC address>:8088/overlay/index.html. It picks a private address, with 192.168.x.x preferred. - On the tablet, connected to the same network, open that address in a browser.
If the page does not load, check these in order:
- Both devices are on the same network, and the tablet is not on a guest or isolated Wi-Fi.
- Windows may block incoming connections to Horizon Labs. If prompted, allow it on private networks.
- The port matches. You can change it between 1024 and 65535; changing it restarts the embedded server.
- The address is the PC’s, not
127.0.0.1, which on a tablet points at the tablet.
Making it look right on a tablet
- Use a canvas that fits. Pick the OBS canvas resolution closest to the tablet’s shape. A landscape tablet suits 1280×720 or 1080p, and a phone held upright suits the 1080×1920 portrait preset.
- Keep the HUD simple. A dashboard is for glances. Gear, speed, RPM and lap times read well; dense tables do not. The Designer lets you cut a HUD down to what you need.
- Keep the screen awake. Browsers and tablets sleep. Turn off auto-lock for the session or use the device’s kiosk or presentation mode.
- Use a fast connection. Wi-Fi hiccups show up as a frozen HUD. A strong signal or a wired PC helps.
Security and privacy
With LAN mode on, Horizon Labs warns that the HUD is exposed to devices on your Wi-Fi and says to use it only on a trusted home network. The server has no password. Turn LAN mode off when you are on a public or shared network.
Good to know
- The page needs Horizon Labs to be running with telemetry from the game. Check your game’s setup on the games page.
- The same address also works as a browser source for streaming: see HUD in OBS and streaming apps.
- For Forza on Xbox, the console sends Data Out to the PC that runs Horizon Labs; the tablet only displays the page.