COMPARISON
Automatic3D vs Spline
Spline and Automatic3D both involve 3D and AI, but they solve fundamentally different problems. Spline creates interactive 3D scenes for the web. Automatic3D generates geometry for physical 3D printing.
LAST REVIEWED 2026-04
The short version
Spline is a web-based 3D design tool that has added AI generation features. Its output is optimized for browser-embedded interactive scenes — product configurators, hero sections, UI elements. The models live on a screen, not on a print bed. Automatic3D's output never appears on a screen in the traditional design sense; it goes straight to a slicer and a printer. These tools sit in different lanes. If you've arrived here wondering which one to pick, the deciding factor is almost always: is your object digital-only (Spline) or physical (Automatic3D)?
CHOOSE SPLINE IF
- →Your goal is an interactive 3D scene embedded in a website or web application.
- →You're a web or motion designer who needs visually polished, browser-renderable geometry.
- →You want a visual editor to refine, animate, or composite 3D elements.
- →Your output lives on a screen, not on a print bed.
CHOOSE AUTOMATIC3D IF
- →You're making a physical object — your output goes to a 3D printer.
- →You don't need visual editing or web embedding; you just need the geometry.
- →You want a text-driven flow with no visual editor to learn.
- →You want something you can hold in your hands when you're done.
What each tool is
SPLINE
Spline (spline.design) is a browser-based 3D design tool targeting web designers, motion designers, and product teams who want interactive 3D elements on websites. It includes AI generation features for creating 3D shapes and scenes from text, a visual editor for refining and animating geometry, and export options for embedding 3D content in web pages. Spline's strength is real-time interactivity and visual polish — it's designed to make web-native 3D accessible without requiring deep 3D software knowledge.
AUTOMATIC3D
Automatic3D is a text-to-3D pipeline whose single output is a printable STL file. There is no visual editor, no web-embedding, no animation. You type a description of a physical object, the system generates a three-view concept image for you to review, and if you confirm, a 500K-triangle watertight STL is generated and downloadable. The flow is optimized for 3D printer operators: fast concept → confirm → slice → print.
Side by side
| AUTOMATIC3D | SPLINE | |
|---|---|---|
| PRIMARY OUTPUT | STL for 3D printing | Interactive 3D for web embedding |
| TARGET USER | Makers, designers, hobbyists | Web designers, motion designers |
| AI GENERATION | Text prompt → concept → printable mesh | AI features within a visual 3D editor |
| OUTPUT FORMAT | STL | Web-native 3D (Spline scene, some export formats) |
| VISUAL EDITOR | None | Full browser-based 3D editor |
| END USE | Physical object on a print bed | Digital object on a webpage |
| FREE TIER | 3 models + 12 concepts / month | Free tier with Spline branding; paid plans remove watermark |
Competitor details based on publicly available information. Pricing and features change — check their site for the latest.
FAQ
Can I 3D print a Spline model?
Spline's geometry is optimized for real-time web rendering — low polygon counts, no manifold guarantees. Some export paths exist, but the resulting mesh typically needs significant repair before it prints reliably. Automatic3D's pipeline produces geometry with printing as the explicit goal, so manifold and watertight requirements are built in.
Can Automatic3D output something I can put on a website?
Not directly — Automatic3D outputs STL, which is not a web-renderable format. If you want to display a 3D model on a website, Spline is the purpose-built tool. The two tools genuinely don't overlap here.
Is the AI generation in Spline comparable to Automatic3D?
They're aimed at different geometry requirements. Spline's AI features generate real-time-renderable shapes within a visual editor context. Automatic3D's pipeline generates denser geometry suitable for printing, with a multi-view concept step to improve geometric consistency. Neither is strictly better — they're optimized for different output requirements.
I want both a printed version and a web version of my object. What should I do?
Use Automatic3D for the printable STL, then use a tool like Blender to decimate and clean up the mesh for real-time use, which you can then bring into Spline. The two workflows are complementary rather than mutually exclusive.
Try Automatic3D free
Free tier includes 3 printable models and 12 concepts per month. No credit card required. STL files ready for any slicer.