---
title: "A Reddit user built a visualizer for CUDA grids, blocks and threads"
description: "A learner's browser tool for picturing how CUDA grids, blocks and thread indexing fit together."
date: 2026-09-07T12:00:00+02:00
lastmod: 2026-11-03T00:46:22+01:00
url: https://klimek.link/posts/2026-09-07-cuda-grid-visualizer/
author: "Marcin Klimek"
source: https://klimek.link/posts/2026-09-07-cuda-grid-visualizer/
---

# A Reddit user built a visualizer for CUDA grids, blocks and threads

Source: [r/CUDA: I built a interactive visualizer for CUDA grids, blocks, and thread indexing](https://www.reddit.com/r/CUDA/s/kPcqlWzlEg)

u/LEOAUSS couldn't picture how CUDA lays out grids, blocks and threads, which is a common problem when you start, so they built a website that draws them and posted it on r/CUDA. One person asked if it could show memory bank conflicts too. Nobody has replied yet.

**TL;DR**

- Author: u/LEOAUSS, built while learning CUDA
- Motivation: grids, blocks and threads hard to picture
- Shows grids, blocks, thread indexing; runs in browser
- Site: cuda-grid-visualizer.vercel.app; no source code or license mentioned
- One comment: asks about memory bank conflicts

Source: https://klimek.link/posts/2026-09-07-cuda-grid-visualizer/