From part description to
precise 3D model & STEP export.
Mechanical engineers and hardware developers use Prompt2CAD to rapidly prototype functional parts. Describe a bracket, an electronics enclosure, or a multi-part assembly — get a parametric 3D model in seconds. Iterate on dimensions through conversation, verify with screenshots, and export to STEP or STL — all in one browser tab.
160 free credits · token-based AI usage
Brief → plan → model
Describe the object, dimensions, materials, and constraints. The agent turns the brief into editable CAD.
Select → ask → refine
Select the part you mean, ask for a change, and let the agent inspect the updated model.
Your prototyping workflow is too slow
You have a mechanical concept in your head — a bracket that needs to nest, an enclosure with a specific clearance, a mounting plate with precise hole positions. To get it into CAD, you open Fusion 360 or SolidWorks, define sketches, extrude features, add fillets. Hours later you have a rough version. Then you iterate. More hours. Each dimension change means re-defining constraints. By version 50 you've spent a week converging on a geometry you could describe in one sentence.
Prompt2CAD collapses this: describe → 3D model → iterate by conversation → STEP export. The geometry converges at the speed of thought — each iteration is one sentence, not a series of feature-tree edits. In early testing, an engineer converged on a 215-iteration telescoping bracket design entirely through conversation, making sub-millimetre adjustments with each message.
From description to precise 3D part in 4 steps
Describe the part
Type a natural language description: "a telescoping bracket, 200mm long, with an inner and outer track and a locking pin." The AI asks clarifying questions about dimensions, materials, and clearances.
Iterate on the geometry
The AI generates a parametric 3D model and verifies it from multiple camera angles. Say "raise the inner track by 0.3mm" or "add a countersunk screw hole on the left face" and the model updates instantly.
Verify with screenshots
The AI takes viewport screenshots from the front, top, and perspective angles. If a clearance looks wrong or a flange doesn't meet, it reads the geometry code and corrects itself.
Export & prototype
Export to STEP for further refinement in Fusion 360, SolidWorks, or FreeCAD. Export 3MF or STL for 3D printing a prototype directly. All dimensions in real-world millimetres.
Generated in 30 seconds
Two-piece pipe saddle clamp — described in one sentence, generated as a parametric assembly. Edit in App →
Why mechanical engineers and hardware developers use Prompt2CAD
Describe mechanical relationships in plain language
"The inner piece nests inside the outer piece with a 0.5mm clearance." "The flange folds over the lip to prevent lift-out." Explain how parts fit together the way you'd describe it to a colleague — the AI builds the geometry to match.
Sub-millimetre iteration through conversation
"Raise the inner track by 1.2mm." "Widen the slot to 4.2mm." "Make the flange 0.3mm thicker." Each change renders instantly. Converge on exact dimensions through conversation instead of clicking through feature trees.
Parametric controls on every dimension
Wall thickness, hole diameter, slot width, clearance gaps — every critical dimension becomes a slider. Drag to explore tolerance variations instantly without re-describing the part.
Self-verifying AI
The AI takes screenshots of its own work from multiple angles and checks for correctness. If a flange doesn't align or a clearance looks wrong, it reads the code, diagnoses the issue, and fixes it.
Export to STEP for your CAD workflow
Export to STEP for Fusion 360, SolidWorks, or FreeCAD with millimeter-accurate dimensions. Or export 3MF or STL for direct 3D printing of prototypes. All dimensions in real-world units — no scaling or conversion needed.
Multi-part assemblies from description
Describe a two-part bracket, a snap-fit enclosure with a lid, or a clamp assembly with a hinge pin and cam lever. The AI handles part positioning and clearances so you get a co-located assembly from the start.
Part types you can design
Strongest with rectilinear and prismatic parts — brackets, enclosures, plates, and assemblies with precise dimensions.
Built for makers and engineers
From DIY builders and product designers to mechanical engineers, people are using Prompt2CAD to design and iterate on real projects.
"I spent weeks trying other AI and modeling tools for built-in storage in oddly shaped rooms. Prompt2CAD was the first that gave me a precise design I could verify and build from, without needing a CAD background."
DIY home renovator, United States
"I designed a custom L-shaped walk-in closet, 240 by 140 cm, with oak panels, hanging sections, drawers, and recessed lighting. I described the layout in detail and refined the proportions as I went. Saved me a long session in modeling software."
Furniture designer, East Asia
"I needed a custom planter for a terrace with an unusual stepped floor, so the base had to follow an L-shape. I described the geometry, refined a few details, and walked away with something I could actually build from. Much faster than starting from scratch in CAD."
DIY builder, Italy
Export to your workflow
Eight formats. From CAD software to SketchUp to 3D printing to web viewers.
Simple, transparent pricing
Start free. Top up when you need more.
Free
No credit card required
Includes up to 160 trial credits where available, so you can create your first CAD model. AI chat is charged by actual token usage.
- Up to 160 trial credits where available
- Free PNG viewport exports
- Photorealistic AI renders (50 credits each)
- Unlimited projects
- Full AI chat & parametric controls
Pay as you go
Top up whenever you need
Includes 1,000 credits — typically ~10 new CAD models or ~20 model updates.
- Everything in Free
- STEP, DXF, 3MF, GLB, DAE, OBJ & STL exports unlocked
- Full parts list & CSV cut-list export
- Printable PDF drawings
- New CAD models typically ~100 credits, complex 150+
- Model updates typically ~50 credits, complex 80+
- Priority AI model access
Start prototyping parts today
Describe your first part and get a parametric 3D model in seconds.
No CAD experience needed · Up to 160 trial credits where available · No credit card required.