---
title: "Reaction-Diffusion Video Online — Webcam RD Generator | TekDetek"
description: "Reaction-diffusion video online in the browser. Webcam or MP4 in, living RD field out. Free to try on phone. Pro for clean unlimited export."
url: "https://vikmil.com/tekdetek-reaction-diffusion-online.html"
---

# Reaction-diffusion video online

**Reaction-diffusion video online** usually means a separate sim window or a desktop app. TekDetek paints the RD field directly on your webcam or file every frame — one tab, no install.
Swipe RD looks on phone for free. Free record is watermarked and 20 seconds. [Pro](https://tekdetek.gumroad.com/l/xkljia) adds the desktop RD node and clean unlimited export.

## Free vs Pro

Free: open the app, swipe and edit looks (phone reaction-diffusion and cellular automata included), luma detection, Hand, watermarked MP4 or PNG up to 20 seconds, watermarked OBS up to 5 minutes (restart anytime).

Pro: clean export with no watermark, unlimited record and OBS, full preset library, Shuffle, Depth and Alt ASCII, add RD / CA / PreText / GEO 3D / Sonify on the desktop graph, higher detection caps. TekDetek is not completely free.

[Open TekDetek](https://vikmil.com/tekdetek/) · [Buy Pro](https://tekdetek.gumroad.com/l/xkljia)

![Reaction-diffusion video online — spots on dancer silhouette](https://vikmil.com/assets/seo-presets/rd-spots.gif)

_RD spots on live video — try on phone, then EDIT crawl and tint._

![Reaction-diffusion online — high-contrast silhouette](https://vikmil.com/assets/seo-presets/rd-out.gif)

_RD out — high-contrast sibling for music-video backgrounds._

## Webcam or file

Use camera for club tests or upload H.264 MP4 for offline passes. Layer under [ASCII](https://vikmil.com/tekdetek-ascii-vj.html) for a readable foreground.
More: [reaction-diffusion video tool](https://vikmil.com/tekdetek-reaction-diffusion.html) · [RD selfie note](https://vikmil.com/tekdetek-note-reaction-diffusion-selfie.html).

## FAQ

### What is free?

Open the app in a browser, swipe and edit looks (phone reaction-diffusion and cellular automata included), luma detection, Hand, watermarked MP4 or PNG up to 20 seconds, and watermarked OBS up to 5 minutes (restart anytime).

### What requires Pro?

Clean export with no watermark, unlimited record and OBS, the full preset library, Shuffle, Depth and Alt ASCII, adding RD / CA / PreText / GEO 3D / Sonify on the desktop graph, and higher detection caps. TekDetek is not completely free.

### Can I run reaction-diffusion on webcam online?

Yes — TekDetek updates the field every frame from your feed in the browser.

### GPU required?

WebGL helps. Test on battery before a live set.

## More tools

- [ASCII video tool](https://vikmil.com/tekdetek-ascii-vj.html)
- [ASCII webcam filter](https://vikmil.com/tekdetek-ascii-webcam-filter.html)
- [ASCII filter for OBS](https://vikmil.com/tekdetek-obs-ascii-filter.html)
- [Browser VJ tool](https://vikmil.com/tekdetek-vj-tool.html)
- [Reaction-diffusion](https://vikmil.com/tekdetek-reaction-diffusion.html)
- [Cellular automata](https://vikmil.com/tekdetek-cellular-automata.html)
- [Nodes](https://vikmil.com/tekdetek-nodes.html)
- [Guide](https://vikmil.com/tekdetek-guide.html)