CAT · Chat Augmentation Tool

YouTube live chat as an overlay for vMix or OBS. Chat only — no polls or pinned messages. No install — paste a link and go.

CAT runs at cat.productionpro.nl. Paste your YouTube stream or popout chat link below and create your overlay URL.

Paste your live stream URL or the popout chat link (right‑click chat → Pop-out chat).

Pick a preset to fill the CSS box; you can then edit the CSS.

Overlay layout
(e.g. 640 = 1/3 of 1920)
For YouTube/Twitch/Minimal line styles only.
0 = fully transparent. Ignored if Background = Transparent.

Layout values from above are merged into the CSS below. Edit the styling; preview and overlay reflect both.

.chat-list layout, gap, padding .bubble-wrap animation .bubble bubble, shadow, radius .tail-left .tail-right tails .bubble-white .bubble-black colors .author .text username & text .user-color-0 through .user-color-5

Max. ~1500 characters for custom CSS in the URL. Layout block (top) is generated from Overlay layout; styling updates live in the preview.

Live preview

By clicking the button below you agree to our Terms of Use (including the YouTube Terms of Service) and Privacy Policy.

In vMix or OBS, add a Browser (Web Browser) source and paste the URL below. Or open a preview in a new tab.

How to use

  1. Paste your YouTube stream or popout chat link at the top.
  2. Click "Create overlay URL" and copy the generated URL.
  3. In vMix or OBS, add a Browser (Web Browser) source.
  4. Paste the overlay URL into that browser field and confirm.
  5. Scale and position the source over your stream.

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