Cascii – A portable ASCII diagram builder written in vanilla JavaScript
3 months ago I wanted to draw an ASCII diagram to include in some documentation at work. I found the few tools online to be insufficient, and was suprised there wasn't a more complete tool to get the job done. Since, I've built Cascii from scratch in vanilla Javascript (I'm not an FE dev, it might be obvious...). I hope it works alright. Please check out the live version at https://cascii.app, report problems, make diagrams to improve your code's documentation. Hope you enjoy using it.
Cascii – A portable ASCII diagram builder written in vanilla JavaScript launched on March 16, 2025 with 238 votes, #167 of 7,215 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Cascii is a portable ASCII diagram builder built in vanilla JavaScript that runs in the browser. It enables developers and technical writers to create ASCII diagrams for code documentation without relying on external tools. The tool offers a more complete feature set than existing alternatives, making it easier to visually represent system architecture, workflows, and other technical concepts directly within documentation files.
written from the facts on this page · September 2026
From the sources
A web-based ASCII and Unicode diagram builder written in vanilla Javascript - casparwylie/cascii-core
Cascii is a web-based ASCII and Unicode diagram builder written in vanilla Javascript. It has zero dependencies on any servers, web packing, libraries, and is no-markup and no-stylesheets. You can start building diagrams by simply opening the cascii.html file in a browser. Cascii is also hosted at cascii.app where you can get short links to your diagrams, open an account, etc (see the Cascii server repo ). ┌╶╶╶╶╶╶╶╶╶╶╶╶╶╶┐ ╷ GroupManager ╷ └╶╶╶╶╶╶╶╶╶╶╶╶╶╶┘ ┌─────────────┐ / ┌─────────────┐ │EventManager │ / ┌───────│SquareLayer │ └─────────────┘ / │ │─────────────│ ┌───────────────┐ \ / │───────│CircleLayer │ ┌────│SwitchLineLayer│ \ / │ │─────────────│ │ │───────────────│ ┏━━━━━━━━━━━━┓…from github.com
Does a similar job
all alternatives →- CPCASCII – Put Diagrams in Your Code2025 · cascii.app · ▲12
A free, open-source ASCII diagram builder written in vanilla Javascript
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An ASCII 3D Rendering EngineJun 2026 · glyphcss.com · ▲211Render 3D models (OBJ, glTF, GLB, STL, .vox) as ASCII art — in the browser, in React or Vue, or straight in your terminal. A three.js-style API with no WebGL and no canvas: just text in a single <pre>.
- ATAscii to SVG2016 · ivanceras.github.io · ▲416
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