Vortexia draws a solid frame, never a transparent one, so turning it into an overlay happens in OBS, and the look you pick matters most. Most looks are a glowing coloured field around a dark fractal shape; laid over a game, that field would cover it, so they work best as a background behind your camera and game. For a true overlay, pick a look with dark space, such as Bass Tunnel with the black gaps between its rings, shown on this page. Then right-click the source in OBS, choose Blending Mode and set Screen: black adds nothing, so it vanishes, and the bright rings glow over your game. Or add a Luma Key filter and raise Luma Min until the dark gaps drop out. Blending modes have been in OBS since version 27.2.
How to use Turn a Solid Visual Into an Overlay
Add it to OBS. Copy your OBS link from the Vortexia dashboard and add it as a Browser Source above your game.
Pick a dark look. Choose a look with dark space, such as Bass Tunnel.
Blend it. Right-click the source, choose Blending Mode and set Screen.
Or key it. Add a Luma Key filter and raise Luma Min until the dark areas drop out.
Specs & output
Engine
Bass Tunnel
Render Mode
rhythm
Iteration Depth
120
Default Zoom
2.50
Colour Shift
280°
Output (Free)
720p / 30fps + watermark
Output (Plus)
1080p / 60fps, no watermark
Output (Pro)
4K / 60fps, brand-kit logo overlay
Audio Source
Browser tab audio (FFT, real-time)
Last Updated
2026-09-28
Frequently asked questions
How does Screen blending work?
Screen brightens whatever is underneath by the brightness of the source on top. Pure black changes nothing, so it disappears, and bright colours glow over the game. Right-click the source, choose Blending Mode, then Screen; Add gives a similar result.
How do I set up Luma Key?
Right-click the source, choose Filters, and add Luma Key under Effect Filters. Raise Luma Min to cut out everything darker than that level and use Luma Min Smooth to soften the edge. Luma Max does the opposite and cuts out the brightest parts.
Which looks work as an overlay?
Looks with plenty of dark space, such as Bass Tunnel, a Plus preset. Most fractal looks have a bright field around a dark shape, and keying out the dark removes the shape rather than the field, so use those as a background.
Can the Browser Source Custom CSS make it transparent?
No. Custom CSS can only reveal what a page leaves empty, and Vortexia draws every pixel of its frame.
Is it free?
Yes. The free plan streams at 720p and 30fps with a small watermark, three engines and Twitch. Plus removes the watermark, renders at 1080p and 60fps, unlocks all eight engines and adds automatic YouTube and Kick events.
About the author
The Vortexia team — Makers of the Vortexia engine.
The Vortexia team builds a browser-based, GPU-accelerated audio-reactive visual engine used by streamers and DJs on Twitch, Kick, YouTube Live and TikTok Live.