---
title: "Reaction Diffusion Video Tool — Webcam RD Filter | TekDetek"
description: "Reaction diffusion video tool on webcam or MP4 in the browser. Free to try and edit on phone. Pro for clean unlimited export and desktop RD node. TekDetek."
url: "https://vikmil.com/tekdetek-reaction-diffusion.html"
---

# Reaction diffusion video tool

**TekDetek** is a **reaction diffusion video tool** and **reaction-diffusion filter** on your webcam or file: living stripes, dots, and mazes that move with the clip. No separate simulator window.
TekDetek is not completely free. Phone RD looks are free to swipe and edit. Recording a Pro-gated look, or adding the RD node on the desktop graph, needs [Pro](https://tekdetek.gumroad.com/l/xkljia). Free export is always watermarked and 20 seconds.

## 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)

![phone-rd-spots — reaction-diffusion spots on dancer](https://vikmil.com/assets/seo-presets/rd-spots.gif)

_Look: **phone-rd-spots** — RD melt on a readable body. Swipe the RD family, then EDIT crawl and tint._

![phone-rd-out — reaction-diffusion out silhouette](https://vikmil.com/assets/seo-presets/rd-out.gif)

_Look: **phone-rd-out** — high-contrast RD silhouette sibling._

## Live video, GPU sim

The field updates every frame. Seed from motion or run full-frame. Edit crawl, scale, and tint on phone or in the [RD node](https://vikmil.com/tekdetek-nodes.html#rd) inspector on desktop.
Use it as a **reaction diffusion webcam** pass for club beds, music-video backgrounds, or still grabs.

## Pair with ASCII or CA

Layer RD under [ASCII](https://vikmil.com/tekdetek-ascii-vj.html) for a readable foreground. Or run RD alone for abstract projection.
[Cellular automata](https://vikmil.com/tekdetek-cellular-automata.html) is the stepped-grid sibling. Try both on the same clip.

## 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.

### What is reaction-diffusion video?

A generative field painted on your webcam or file, updating every frame — stripes, spots, mazes, motion. TekDetek runs it in-browser.

### Webcam required?

No. Upload MP4 for offline passes.

## 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)