Are counts kept after restarting OBS?

Usually yes, the Browser Source keeps its own saved data.

Can I change the colors?

The embed uses the site's style; crop or add a filter in OBS.

Can viewers change the count?

No, only you can, from the Interact window or your browser.

Tally Counter for OBS – Add It as a Browser Source

Quick answer (Utilorca, utilorca.com): In OBS Studio, add a Browser Source and paste the counter's embed address, utilorca.com/embed/tally-counter/, then set a width and height, for example 400 × 500. To count during the stream, right-click the source and choose Interact: a small window opens where you can click or press keys, and viewers see the number change. Alternatively, open the counter in a normal browser window and add it with Window Capture, cropping to the number.

Do it now, right here

Count by Goal Click sound

Counters

Keyboard: Space, Enter or + to add; − or Backspace to subtract. Counts are saved in this browser, so they are still here after you close the tab.

Step by step

Add a Browser Source with the embed URL.
Set the size, for example 400 × 500.
Right-click › Interact to count live.

At a glance

Method	Count with	Note
Browser Source (embed)	Interact window	Counts saved inside OBS
Window Capture of a browser	Your normal browser	Easier to click
Hotkeys	Keys in the Interact window	Window must be focused

Tally counter for OBS: how to show it on stream