Real CAD,
right in your browser.
Design parts that fit, then print them. No install, no uploads.
Get early accessSmall group first · Chrome or Edge, desktop
Draw it. Pin down the sizes.
See it in under a minute.
“Can you make me something for all the pens?”
Something for all the pens
Six steps. One desk tidy.
01 180 × 96 mm
Sketch outline
Draw the footprint. Type the numbers.
- Sketch outline (180 × 96 mm): Draw the footprint. Type the numbers.
- Extrude base (26 mm): Pull the sketch up into a solid.
- Cut two trays (88 mm long): Pocket two trays for pens and clips.
- Cylinder pen cup (Ø 60 mm): Add a cup and hollow it in one step.
- Fillet edges (R 2 mm): Soften every edge you will touch.
- Cut phone slot (10°): Lean a slot back ten degrees.
- Print it (STL · 3MF): Export STL or 3MF and print it.
It remembers how it was made.
The recipe
- 1Sketch Outline168 × 96 mm
- 2Extrude Base26 mm
- 3Cut Two trays96 mm long
- 4Cylinder Pen cupØ 60 mm
Drag the width. Only dependent steps rebuild.
Serious tools, without the weight.
Nothing to install
Open a tab and start.
Measured, not eyeballed
Type mm, degrees, or wall * 2.
Every step editable
Edit, disable, reorder or roll back.
It asks, never guesses
Unsure which edge you meant? It asks.
Your designs never leave your computer.
- No cloud copy
- We never hold your designs.
- Works with Wi-Fi off
- Once loaded, it keeps working.
- Your files, your folders
- Save .caddy anywhere. Crash copy stays local.
Turn on an AI assistant and it sees what it edits.
Describe it. Your assistant builds it.
Optional, through WebMCP. Off until you turn it on.
You ask
Make me a desk organiser, 168 mm wide, with two trays and a pen cup on the right.
In Caddy
- Reading the design: empty, units in mm
- Sketching a 168 × 96 mm outline on Top (XY)
- Extruding the base 26 mm
- Cutting two trays 18 mm deep
- Adding a Ø 60 mm pen cup on the right
Allow this change? Add a cylinder to Body 1.
You set what it may do · Every change undoable · Experimental
Works with WebMCP assistants. See the FAQ.
Useful things, made to measure.
Desk organiser
Sized to your desk gap.
L-bracket
Example included.
Box with a lid
Example included.
Electronics case
Cut-outs for every port.
Phone stand
Driven by a few numbers.
Replacement knob
Fits the shaft you measured.
Early access
Get in early.
Small group first. We'll write to you personally.
You're on the list.
We'll write when your place is ready.
Sign-up opens soon. Email us to join →
How we use your email
- What: your email, your note, and when you agreed.
- Why: only Caddy early-access emails. Never sold.
- Where: stored with Clerk. The form loads Clerk and a Cloudflare bot check only once you start it.
- Removal: email unmesalabs@gmail.com and we'll delete it.
Questions, answered.
Anything else? Email us.
What do early testers get?
Early use of Caddy and a direct line to us. Your feedback shapes what's next.
Is it free?
Yes, for early-access testers.
Which computers does it run on?
Current Chrome or Edge on a Mac or Windows desktop or laptop. No Firefox, Safari, phones or tablets yet: CAD needs a pointer and space.
Can I 3D print what I make?
Yes. Export STL or 3MF for your slicer. 3MF keeps units, so size stays right.
Can I open files from other CAD apps?
Import STEP as solid bodies and build on them. Their history doesn't come across.
Which AI assistants work with Caddy?
Ones that can use a page's WebMCP tools. We've tested Claude in Chrome. You turn tools on and set what they may do. They see what they edit.
Do I have to use AI?
No. It's optional, off by default and experimental.
What can't it do yet?
Joint assemblies, sweeps, drafts and 2D drawings. Expect rough edges and frequent updates.