You'll need OBS with the Browser plugin. If you do not have that installed, download it and install it below:
XSplit has what you need built in. Just continue onward.
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Now you need to fill out the form below to generate your hosted URL for the configuration. The preview below will show you what the final alert will look like.
The follower alert works best for smaller channels. If your channel is large, people can (and probably will) abuse this system to get multiple alerts.
You can test what the alert will look like by appending
&preview=true onto the end of the URL.
You cannot test follow alerts by having someone refollow your channel.
Add a new "Browser" source to your scene and enter the above URL.
Click Add Source -> Other -> Webpage URL and enter the above URL.
After entering the URL in either OBS or XSplit, change the width and height inside the source settings to:
If you know how to use CSS, you can use your own custom CSS for the alerter in OBS and XSplit. In the source, click on the CSS tab or setting.
The CSS properties you can modify are below.