Animated Stream Overlay Maker — Design Your Own in the Browser

An animated stream overlay maker lets you build the moving parts of your stream — borders, BRB screens, starting-soon scenes, alerts backdrops — without hand-animating video files. Reactor Studio takes a different path from template marketplaces: instead of picking design #47 and seeing it on three other channels the same week, you start from your own artwork, generate the animation with AI-written WebGL shaders, add live controls when you want them, and export a single transparent HTML file for OBS.

Template overlays vs. generated overlays

Template packs are fast, but they come with trade-offs: your channel looks like every other buyer of the pack, the animation is baked into a video loop (visible seams, fixed resolution, no reactivity), and any change means buying or commissioning a new pack.

A generated overlay flips this around:

• Your art stays yours. The effects are applied to your existing images — logo, frame, mascot, hand-drawn panels.
• Real-time rendering, not a video loop. Effects are WebGL shaders running at 60 fps: no loop seams, crisp at any resolution, tiny file sizes.
• It can react. Overlays can respond to sound — bass pulses, beat-driven glow, a full 16-band equalizer — which a video loop can never do.
• You can add the dials. Generate controls for an effect, then tune properties such as speed and color live instead of commissioning a new animation.

How it works

1. Add your artwork in Reactor Studio — it runs in the browser, nothing to install.
2. Mark zones on the parts that should move: the frame, the text, the background, the bars.
3. Describe the effect in plain language — "a slow ember glow along this border, brighter on the beat". The AI writes a GLSL shader for exactly those zones. Starter effects (like the 16-band EQ Bars) give you proven starting points.
4. Generate controls if needed, then tune them live until the effect fits your scene's mood.
5. Export the scene as an OBS overlay: one self-contained HTML file with a transparent background, added to OBS as a browser source. The full OBS walkthrough is here: How to Add an Audio-Reactive Overlay to OBS.

What streamers build with it

• BRB and starting-soon screens with a live equalizer instead of a static "back soon" card — see the audio visualizer guide
• Webcam borders that breathe, glow, or pulse with the music
• Logo idents — your logo with living light instead of a static PNG
• Scene backdrops with subtle ambient motion that does not distract from gameplay

One scene, multiple states

Layer visibility is baked into each export, so different scene states — BRB with equalizer, gameplay frame without — are simply separate exports of the same project, each added to its own OBS scene. Switching scenes in OBS switches the overlay state.

Frequently asked questions

Do I need design or coding skills?

No. You bring an image — existing overlay art, a logo, even a photo — and describe the motion you want in plain language. The AI writes the shader code; parameterized effects can be adjusted with live controls.

What file do I actually get?

A single self-contained HTML file per scene. It has a transparent background, starts playing on its own, and is added to OBS as a browser source pointing at the local file.

Does it work with Streamlabs or other tools?

Yes — the export is a standard HTML browser source, so any streaming tool that supports browser or HTML sources can display it, including Streamlabs Desktop.

Is it free to try?

Creating effects, playing with demo controls, and previewing in the browser is free, and a free account includes a one-time starter credit of AI generations. Saving and syncing, custom controls, and file exports are part of Pro (CHF 4.50 per month early price, regularly CHF 9).