Pascal Editor is an open-source 3D architecture editor developed by Pascal. No specialized software installation is required — open a browser and you can start building floor plans and structures in three dimensions. Its defining trait is a semantic scene graph that keeps walls, slabs, zones, and furniture as meaningful structure, so the contents can be read and written not only by people but by AI agents. It is MIT licensed, and the editor, viewer, and scene engine are published as NPM packages, so it can also be embedded into your own product.
Key Features
- A 3D architecture editor that runs entirely in the browser: Rendering uses the Three.js WebGPU renderer with React Three Fiber, so it runs smoothly with no installation. Architecture-specific operations — drawing walls, defining zones, placing floor slabs, positioning furniture — are available from the start
- AI generation and manual tools in two stages: Use AI generation to turn sketches or instructions into geometry and rough out a design quickly, then switch to the regular editing tools when you need to work out dimensions and details. The “AI for the first draft, hands for the finish” division of labor is built into the workflow
- A built-in MCP server so AI agents can operate it:
npx @pascal-app/cli editorstarts the editor and its MCP server locally, and commands such aspascal mcp setup claudeconnect it to an AI client. An agent can then load a scene, check room areas, or change materials. Saves made from the CLI side are reflected in the browser as well - Hierarchical scene structure: Models are held as site → building → level → walls, slabs, and zones. Level display can be switched between stacked, exploded, and solo views, which makes multi-story buildings easier to handle
- Importing scanned spaces and walkthroughs: Scans of real spaces and 2D reference drawings can be loaded and designed over. When finished, you can walk through the result in first person
- Plugins and NPM embedding: Functionality can be extended through a plugin mechanism, and packages such as
@pascal-app/core,@pascal-app/viewer, and@pascal-app/editorlet you embed a 3D viewer or editor into your own application - Asset library and materials: A large set of ready-made 3D objects is provided, and Material Studio can turn prompts or photos into paintable materials
Pricing
| Plan | Price | What’s included |
|---|---|---|
| Open source (self-hosted) | $0 (MIT license) | Get the source and run it locally. Embedding via NPM packages is also possible |
| Hosted editor (editor.pascal.app) | $0 | Use it straight from the browser. Sign up to save and share |
| Studio generation features | Free credits granted daily | AI features such as image, video, and material generation. Check the official site for what happens beyond the free allowance |
Pricing is as of August 2026. Please check the official site for the latest pricing.
Pros & Cons
✅ Pros
- The editor itself is free and MIT-licensed open source, allowing broad freedom for commercial use and modification
- No installation is needed and it runs in the browser, so the barrier is low even without 3D CAD experience
- Because you can generate a shape with AI and then refine it by hand, it is easier to avoid the “leave everything to the AI and watch it fall apart” pattern
- MCP support makes it possible to delegate parts of the design work to AI agents such as Claude
- Distributed as NPM packages, so it can be repurposed to embed a 3D viewer in your own product
⚠️ Cons
- It is not a CAD system that satisfies regulatory or drafting requirements such as building permit applications or construction drawings
- Updates are frequent and features are in flux, so building it into a business workflow exposes you to version differences
- Rendering assumes WebGPU, so older browsers and low-powered devices may not run it comfortably
- Making the most of MCP, local execution, and plugins requires some knowledge of Node.js and the command line
- The limits on AI generation credits and the conditions for paid usage are not spelled out, making costs hard to predict at high volume
Comparison with Similar Services
| Criteria | Pascal Editor | SketchUp (Web) | Planner 5D | Blender |
|---|---|---|---|---|
| Main use | 3D architectural modeling and sharing | General 3D modeling and architecture | Floor plans and interiors | General-purpose 3D production |
| Environment | Browser / local execution | Browser | Browser and apps | Desktop application |
| License | Open source (MIT) | Commercial proprietary | Commercial proprietary | Open source (GPL) |
| AI integration | AI generation + agent control via MCP | Limited | Some AI assistance | Not built in by default |
| Price | Free | Free tier / paid plans | Free tier / paid plans | Free |
| Embedding | Possible via NPM packages | Not available | Not available | Not available (requires separate development) |
Who Is It For
- People who want to study floor plans or renovation ideas in 3D without buying dedicated software
- Developers and designers who want to let AI agents touch design work
- Builders who want to embed a 3D floor plan viewer or editor into their own web service
- People in real estate, interiors, or housing who want to present visually to clients
- People who value open source and want to keep their data and tools in their own hands
Summary
Pascal Editor combines the wide entry point of “a free 3D architecture editor that runs in the browser” with the technical sharpness of “AI agents can read and write the scene” — an unusual pairing. The semantic scene graph and MCP support make it possible to experiment with having AI help design, while the editor on its own is perfectly usable for studying layouts and preparing presentations. Start by drawing a few walls in the browser version, and move to local execution when you want to try agent integration. It is realistic to treat it as a tool for exploration, proposals, and prototyping rather than a replacement for production CAD.