PCB design in the browser · a hosted MCP for your agent

PCBs Made Simple.By you, or by your agent.

Design a board yourself, or let your agent build it. 3V3 places, routes and checks it in your browser, then exports Gerbers for any fab.

Start free · 14 days of Pro Connect your agent

No card to start. Your boards stay yours: export always, paid or not.

An ESP32-C3 sensor board, routed and checked. Open one like it →

Proof

PHOTO · 1200×900 The ESP32 carrier in a hand, powered, LED on. Real, fabbed, not a render.

Real boards, in real hands

Every board we show was fabbed and powered first. Each photo links to the board itself, so you can open the exact design.

VIDEO · uncut · 16:9 An agent builds a board from one prompt to Gerbers. No cuts, the clock in frame.

Prompt to Gerbers, uncut

About four minutes from one prompt to Gerbers: the median of five real agent runs, every board passing its design-rule check. Nothing sped up; the transcript is next to the video, every tool call in it.

— boards exported this week · counting starts at launch

Boards made this week

A live count of boards taken all the way to Gerbers on 3V3. Our own agents' boards are counted apart.

How it works

Four steps, one trace.

You ask
“A 50 × 50 mm board with an ESP32-C3, USB-C power and a status LED.” In the editor, or to your agent.
Your agent builds
It places the parts, routes the copper and runs the checks, through 3V3's tools. You watch it happen in the browser.
You check
Every trace is yours to read and change. The design-rule check has to say zero errors before anything leaves.
It's real
Gerbers, a BOM and a placement file, ready for JLCPCB, PCBWay, Aisler or any fab you like.

For agents

The PCB tool your agent can finish a board with.

3V3 runs a hosted MCP server. Your agent gets the same tools the editor uses: place, route, check, export. You get the board in your browser, live, the whole time.

Works with Claude Code, Claude Desktop, Cursor, ChatGPT and any MCP client.
Your key, your boards: keys are scoped, rate-limited and revocable in one click.
Every tool call is logged on your account, so you can see exactly what your agent did.

Connect your agent

# one line, then ask for a board
$ claude mcp add --transport http 3v3 https://mcp.3v3.dev/mcp \
    --header "Authorization: Bearer $V3_KEY"

> Make a 50 × 50 mm board with an ESP32-C3, USB-C power
  and a status LED. Route it and stop when the check is clean.

One board, every angle

See it the way the fab will.

RENDER · copper, both layers · 1600×1000Exported from 3V3 itself: layout.svg of the reference board.

Pricing

One plan. Fourteen days to try it.

Start

£0 for 14 days

Everything in Pro
No card asked
Your agent connected from day one

Pro

£15 a month

or £150 a year · prices include UK VAT

Unlimited boards, 4+ layers, any size
The hosted MCP for your agent
Gerbers, BOM and placement for any fab

Start free

Founding members

£10 a month

or £100 a year, locked while you stay subscribed

For the first 500 subscribers
Closes at 500 or on 31 December
Your name on the founders page, if you like

Your boards are never held hostage. After the trial, or if you stop paying, every board stays yours, read-only, and export always works.

Your boards stay yours.

Stored on our own servers in Europe; nothing is shared with anyone.
Never used to train anything.
Export everything, any time, paid or not.
Report a problem to info@3v3.dev (subject “Security”); we answer within two working days.

How we keep it that way