Private beta · Workshop assistant

Say what it
must do.

Describe a machine and what it must do. Haviland designs the 3D-printable parts, writes the Arduino code and checks the whole build before you print a thing.

Request an invite

See it build

Runs locally

Asks before touching hardware

Windows & macOS

Session · Rover

On this computer

You

A rover that stops before it hits anything.

Haviland

Parts

Ten, on one printed plate

Firmware

Compiled. Motors capped at 196/255.

Requirements

4 of 4 met, in simulation

Unchecked

1: a second physics model isn’t installed

Gate verdict

Fail · 0 errors · 1 unchecked

It won’t round “unmeasured” up to “fine”. Simulated; nothing here has met a real floor yet.

Drives the tools you already use

Claude

OpenSCAD

Blender

arduino-cli

whisper.cpp

git

001

Process

How it builds a machine.

Five steps, on a real machine: a rover that stops before it hits anything. Scroll to follow it.

002

case study

What it built, and what it caught.

Every time the gate said no, it said why. This is the rover’s log.

To stop

simulated

On six AA cells

2.4

calculated

Requirements met

of 4

verified in simulation

Errors at the gate

1 unchecked, so still FAIL

Less sure to more sure: assumed, sourced, calculated, simulated, measured, validated. Nothing here is measured yet.

Case study · Rover

A rover that stops before it hits anything.

Ten parts on one printed plate, designed, wired, programmed and checked by Haviland. Four times the gate said no, and each time it said why.

Read the rover’s case study

Run

What the gate found

What changed

Fail

A wheel sat inside its motor.

The left gear motor now turns the other way, so both show their clean side to the wheel.

Fail

A cracked vendor mesh couldn’t be measured where a part sat flush against it.

The motors hang on zip ties, clear of the plate, so every gap around them can be measured.

Fail

Six AA cells, less the driver’s 2.55 V drop, put 6.5 V across a 5 V motor.

The firmware caps the motors at 196/255, so 6.5 V averages 5.0 V.

Fail

Zero errors. One check can’t run: a second physics model isn’t installed here.

Nothing to fix yet. The gate still says FAIL; it never rounds “unmeasured” up to “fine”.

All four requirements pass in simulation. Nothing here has met a real floor yet.

003

what it does

Parts, firmware, and the proof.

What it makes, and the two rules that keep it honest about what it knows.

Parts. It designs printable parts in OpenSCAD and Blender, with the tolerances a printer needs, and draws the whole machine as it will sit together.

Every screw hole an M3 clearance hole: 3.4 mm

Plate underside set by the motors: 43.7 mm

Every part says where its geometry came from

Left elevation of the rover with its dimensions

Parts. It designs printable parts in OpenSCAD and Blender, with the tolerances a printer needs, and draws the whole machine as it will sit together.

Every screw hole an M3 clearance hole: 3.4 mm

Plate underside set by the motors: 43.7 mm

Every part says where its geometry came from

Firmware. It writes and compiles the Arduino sketch, and knows which constant sets which number on the machine.

Firmware. It writes and compiles the Arduino sketch, and knows which constant sets which number on the machine.

The gate. It measures the assembled machine: collisions, clearances, whether it tips, whether the battery lasts.

The gate. It measures the assembled machine: collisions, clearances, whether it tips, whether the battery lasts.

Evidence. Every number says how it was found. The rover’s stop is simulated; nothing on it is measured yet.

Evidence. Every number says how it was found. The rover’s stop is simulated; nothing on it is measured yet.

Permission. Twelve rungs, from reading your project to moving a machine. No mode reaches an instrument or a machine.

Permission. Twelve rungs, from reading your project to moving a machine. No mode reaches an instrument or a machine.

Parts. It designs printable parts in OpenSCAD and Blender, with the tolerances a printer needs, and draws the whole machine as it will sit together.

Every screw hole an M3 clearance hole: 3.4 mm

Plate underside set by the motors: 43.7 mm

Every part says where its geometry came from

Not sure where to start? Say one sentence.

Try “a quiet desk fan that stops when nothing is in front of it.”
Haviland takes it from there: the parts, the firmware and a check of the whole build.

Request an invite

Kept on your machine.

Four rules it keeps while it works.

Runs locally

Answers only itself

Refusals survive a yes

Every change undoable

004

why haviland

An engineer that shows its work.

It checks its own work, asks before it acts, and keeps your projects on your own computer.

It checks its own work

A gate measures the assembled machine: parts that collide, gaps too tight to assemble, whether it tips, whether the battery lasts.

It checks its own work

A gate measures the assembled machine: parts that collide, gaps too tight to assemble, whether it tips, whether the battery lasts.

It checks its own work

A gate measures the assembled machine: parts that collide, gaps too tight to assemble, whether it tips, whether the battery lasts.

It asks before it acts

Twelve rungs of permission. By default it stops at compiling, and a yes buys one rung, for one turn.

It asks before it acts

Twelve rungs of permission. By default it stops at compiling, and a yes buys one rung, for one turn.

It asks before it acts

Twelve rungs of permission. By default it stops at compiling, and a yes buys one rung, for one turn.

It runs on your computer

Your projects live on your disk, each with its own history, so undo reaches back to the first minute.

It runs on your computer

Your projects live on your disk, each with its own history, so undo reaches back to the first minute.

It runs on your computer

Your projects live on your disk, each with its own history, so undo reaches back to the first minute.

005

built on

The tools it drives.

Haviland doesn’t replace your engineering tools. It runs them for you, and checks what they make.

Haviland · on your computer

T-01

Claude

Does the thinking

T-02

OpenSCAD

Parts with exact dimensions

T-03

Blender

Organic shapes

T-04

arduino-cli

Compiles; uploads when you allow it

T-05

whisper.cpp

Hears you, on your own computer

T-06

git

A history for every project

006

faq

Common questions

Have any other questions?

What does it run on?

Your own computer, on Windows or macOS. It drives the tools you’d use anyway: OpenSCAD and Blender for parts, arduino-cli for firmware.

Does it need the internet?

Yes, for its thinking: Haviland runs on Claude. Your projects, their files and their history stay on your disk.

Who can use it?

Adults. Haviland runs on Claude, and Claude accounts are for people aged 18 and over. The beta is invite-only for now.

Can it flash my board on its own?

Not by default. Its default mode stops at compiling, and a yes buys exactly one rung for one turn. A mode that can flash exists, and you switch it on deliberately. No mode drives instruments or machines.

What can’t it do yet?

Circuit-board layout and circuit simulation. Both are on the roadmap. Until they’re real, this page won’t claim them.

007 · Invite

Invite-only beta

Say what itmust do.

Say what itmust do.

Say what itmust do.

How it builds a machine.

What it built, and what it caught.

Parts, firmware, and the proof.

An engineer that shows its work.

The tools it drives.

Common questions

Ask for a place.

Say what it
must do.

Say what it
must do.

Say what it
must do.