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OBS widgets: on-screen chat and text-to-speech

A Koster widget is a link for a Browser source in OBS. It shows Twitch chat on top of your game or reads messages and channel point rewards aloud. You set up the look and the voice on the site with a live preview, and changes show up on stream right away, no new link needed.

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How it works

  1. Create a widget

    Under “OBS widgets”, pick what you need: on-screen chat or text-to-speech only.

  2. Paste the link into OBS

    Add a Browser source to your scene and paste the widget link into it.

  3. Style it on the site

    Theme, font, background and message behavior change in Koster, and OBS picks them up on its own.

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What it does

  • Chat styling

    Dark or light theme, text size, weight and color, background and padding for the whole chat and separately for messages, rewards and system messages.

  • Message behavior

    New messages at the bottom or the top, entrance animation, how long a message stays, badges and emotes.

  • Filters

    Hide system messages, “!” commands and channel point rewards.

  • Text-to-speech

    Two Russian voices, speed from 0.5× to 1.5×, volume, reading the username and a chime before each message.

  • What not to read aloud

    Messages from listed bots, commands, links, emotes, extra symbols and messages with banned words. Very long text gets trimmed.

  • Text-to-speech for points

    Only messages from a channel point reward are read aloud. Koster creates the Twitch reward itself, and you can have two rewards with different voices.

  • Several widgets

    A widget for each scene. Koster warns you if text-to-speech is on in two widgets and a message would be read twice.

FAQ

How do I add Twitch chat to OBS?

Create a chat widget in Koster and copy its link. In OBS, add a Browser source to your scene, paste the link and set the width and height to fit your layout.

How do I set up text-to-speech for chat on stream?

Create a text-to-speech widget or turn on text-to-speech in a chat widget, then add it to OBS as a Browser source. Voice, speed and filters are set on the site.

Which voices are available?

Two Russian voices for now. More voices, viewer-picked voices and AI voices are planned.

Do I need a new OBS link after changing settings?

No. The widget gets its settings from the server, and OBS shows the changes right away.

How much do the widgets cost?

All widgets are free during the open beta.

More Koster tools

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Koster is free during the beta. All you need is a Twitch, Discord or Telegram account.

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