🟢 Beginner ⚙️ Type: 3D Architectural / Building Editor 💸 Free & Open Source (MIT) ⭐ 16,600+ GitHub Stars
What is Pascal Editor?
Pascal Editor is a free, open-source 3D building and architectural layout tool that runs entirely natively in your web browser. Importantly, despite its name, it is not a code editor or IDE for the Pascal programming language—it is a modern spatial design workspace for creating rooms, walls, roofs, and interior layouts.
The project has gained massive popularity because it completely removes the usual friction associated with 3D design software. There are no heavy desktop clients to install, no forced account signups, and no proprietary cloud dependencies. You simply open the web application, type a natural-language brief (such as “A two-story modern villa with a pool”), and the AI will generate a foundational layout that you can manually refine in a fully editable 3D workspace.
Under the hood, it is an engineering marvel. It leverages a modern web stack—React 19, Next.js, React Three Fiber, Zustand, and WebGPU—to deliver a robust desktop-class modeling environment featuring local autosave, full undo/redo history, and IFC/JSON import and export directly in the browser.
Who is it for?
- Architects and Interior Planners looking for a quick, friction-free way to test structural layouts, block out rooms, or plan interiors without launching heavy CAD software.
- Game Developers and Level Designers needing a rapid prototyping environment to build structural assets and export them via JSON or IFC formats into their game engines.
- Design Technologists wanting an open-source, React-based foundation to inspect, modify, or self-host their own custom spatial tools.
- Agencies and Freelancers who need a zero-install, no-signup link to collaborate on or present early spatial ideas instantly to clients.
What makes it special?
- Natural Language to 3D — You don’t have to start from a blank canvas. Simply provide a text prompt describing the building, and the editor will automatically generate a block-out that you can start modifying immediately.
- Zero-Friction Access — There are absolutely no downloads or login walls. Anyone can evaluate the tool instantly by visiting
editor.pascal.app. - Professional Core Features — Despite running seamlessly in a browser, it includes robust, granular tools for manipulating walls, slabs, ceilings, roofs, doors, windows, and multi-level zone planning.
- Local-First Architecture — The editor protects your experimentation with local autosave functionality and a comprehensive undo/redo history, keeping your data entirely in your control without syncing it to external servers.
- Built for AI Agents — The repository is specifically documented with an
AGENTS.mdfile and pre-configured skills, making it incredibly easy for tools like Claude Code or Cursor to navigate the monorepo and build custom extensions.
Requirements before you start
If you simply want to use the tool, you only need a modern web browser (like Chrome, Edge, or Safari) and a device capable of WebGL/WebGPU rendering. However, if you want to self-host or modify the code locally, you will need a development environment:
- Bun 1.3+ (or Node.js 18+) — The JavaScript runtime required to build the packages and host the local development server.
- Git — To clone the monorepo from GitHub to your machine.
- Google Maps API Key (Optional) — Only necessary if you want to enable real-world address search functionality in your self-hosted version.
Step-by-step installation
Method 1 — Run in Browser (No Install)
The fastest way to experience Pascal Editor is to skip installation entirely. Navigate to editor.pascal.app, type in your building brief, press Enter, and start designing immediately.
Method 2 — Local Development Setup
If you want to run the editor locally on your own machine to modify the code or self-host the application, open your terminal and clone the repository:
git clone https://github.com/pascalorg/editor.git
cd editorInstall the required dependencies using Bun (or your preferred package manager like npm or yarn):
bun installStart the local development server:
bun devThe editor will instantly be available locally. Open your browser and navigate to http://localhost:3000.
Common errors and fixes
| Error | What it means | How to fix it |
|---|---|---|
| Application lags severely or fails to render 3D scenes | Your web browser’s hardware acceleration is disabled, forcing your CPU to handle complex WebGPU 3D rendering. | Go to your browser’s system settings, search for “Hardware Acceleration” (or “Use graphics acceleration when available”), toggle it ON, and restart the browser. |
bun: command not found | You tried to run the recommended setup commands, but you do not have the Bun runtime installed on your machine. | You can either install Bun by following the instructions at bun.sh, or simply substitute the commands with standard Node package managers (e.g., use npm install and npm run dev). |
| Map search functionality is broken on localhost | The NEXT_PUBLIC_GOOGLE_MAPS_API_KEY environment variable is missing from your self-hosted setup. | The core 3D editor works perfectly without this key. However, if you want address searching to function, you must generate a Google Maps API key from the Google Cloud Console and add it to your .env file. |
Free vs Paid comparison
| Feature | Pascal Editor (Open Source) | Professional CAD SaaS (e.g., SketchUp Web) |
|---|---|---|
| Cost | $0 (Free MIT License) | $119 to $349+ per year |
| Account Requirement | 🟢 None (Instant Access) | ❌ Forced account creation |
| Offline / Local Hosting | ✅ Yes (Self-hostable via GitHub) | ❌ Locked strictly to vendor cloud ecosystems |
| Advanced Engineering Tools | ⚠️ Limited to layout, zones, and interior blocking | ✅ Full engineering & construction drafting |
Bottom line: Pascal Editor is a masterclass in modern browser engineering. If you need a completely free, highly responsive 3D workspace to rapidly prototype houses, levels, or interior scenes, it is unmatched in its ease of access and developer-friendly architecture. However, if you are generating final construction blueprints or highly complex engineering models, you will still need to eventually export your work to a dedicated professional CAD program.
Alternatives — 3 similar tools
1. SketchUp Free (Web)
The undisputed heavyweight for browser-based 3D modeling. It is highly intuitive and beloved by architects for rapid conceptualization. However, it requires an account signup, saves files to their proprietary cloud, and locks advanced professional features behind expensive annual subscriptions.
2. Sweet Home 3D
A classic, free architectural design software application focused specifically on drawing house plans and arranging furniture. While it has an online browser version available, its user interface is significantly more dated than Pascal Editor’s fluid, modern React-based environment.
3. Archilogic
A highly polished, enterprise-grade platform for generating and managing 3D floor plans and digital twins in the browser. It offers incredible automation and presentation tools, but it is a commercial product firmly targeted at large real estate businesses rather than indie developers or hobbyists.
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