Cobalt
A man presses the button of his Cobalt prototype and speaks to his wrist

Voice-controlled AI hardware

Voice commandson yourwrist.

Press, speak, and your phone does the rest. Cobalt is a 20 mm board that turns a classic digital watch into a voice remote for your apps and your agents.

Watch the demo Try the agent

633 on the waitlist

V1 prototype, on the wrist

This chip is where the magic happens.

The CB-91AI board at actual size

Actual size · 20 mm

Press to talk

Press, speak, release. The microphone only listens at that moment.

Linked to your agents

The apps and the AI agents on your phone, one button away.

A minimalist vintage look

The digital watch you know, on your wrist.

Six months of battery life

On the watch’s coin cell, at twenty commands a day.

A man speaks to his digital watch fitted with Cobalt
Press, speak, lower your wrist.

Press · Speak · Done

Everyday voice commands.

  • Music“Play some jazz”
  • Alarm“Wake me up at 7”
  • Reminders“Remind me to call Paul at 6 pm”
  • Calendar“Dentist on Friday at 2 pm”
  • Directions“Take me to the station”
  • Notes“Note: new strap colours”
  • Messages*“Tell Marie I’m on my way”
  • Calls*“Call Mum”

* Android only.

Watch the demo Try the agent

Inside the watch

A powerful chipin a vintage case.

Content missing

Voice

A microphone that only listens while you press.

Cobalt Link

The wireless link to your phone, Android and iOS.

Commands

Music, messages, calls, alarms, reminders, calendar, directions.

Buttons

The watch’s buttons: one to talk, two for music and volume.

Interface

The original display keeps the time and the alarms. A discreet light tells you when something is waiting for you.

Technical — The board

More sensors in the same case.

Same outline, same contacts, same coin cell as the original module, plus a microphone, motion sensing, a light, a sound and a wireless link.

All the specifications
The CB-91AI board seen from above, with its main components20 mmNordic nRF52840Arm Cortex-M4F processorCobalt LinkAntenna of the wireless linkIMUMotion: steps, sleep, gesturesLED RGBLight notificationsBuzzerAlarms and confirmationsMicrophoneMEMS, only listens while you press
The CB-91AI board seen from above
Nordic nRF52840
Arm Cortex-M4F processor
Cobalt Link
Antenna of the wireless link
IMU
Motion: steps, sleep, gestures
LED RGB
Light notifications
Buzzer
Alarms and confirmations
Microphone
MEMS, only listens while you press
How to fit it

Why we build

Simple on the wrist.Powerful in the pocket.

Cobalt started from one conviction: the most useful computers are the ones that ask the least of us. So we kept the object on the wrist as simple as a digital watch from the 1980s, and put the intelligence where the power already is: the phone in your pocket.

Cobalt is an independent project. It is not affiliated with Casio Computer Co., Ltd. and is not endorsed by Casio. “Casio”, “WR” and “F-91W” are trademarks of their respective owners, named only to indicate that our board is compatible.

Read the full Casio notice

Leave your phonein your pocket.

France

Designed and assembled in France.

Open source

The hardware, the firmware and the app.

State of the art

Our own transmission protocol and an agentic intelligence.

Be told as soon as Cobalt is available.

We only use your address to tell you. Privacy policy

Legal notice

Publisher

Cobalt Watch, a French simplified joint-stock company (SAS) with a share capital of Content missing euros.
Registered office: Content missing, Paris 2e, France.
Paris Trade and Companies Register (RCS): 106 218 159.
VAT number: Content missing.
E-mail: jean@cobalt-watch.com
Telephone: Content missing

Publication director

Jean de Bailliencourt, president of Cobalt Watch.

Host

Hostinger International Limited
61 Lordou Vironos Street, 6023 Larnaca, Cyprus
hostinger.com/contact

Other names

Cobalt Watch and CB-91AI are the names of our company and of our board.

The other company and product names on this site belong to their owners. We name them to say what our board and our app work with, or to compare them with our products.

Licences

The firmware of the watch is published under the Apache-2.0 licence.

The other texts, the photos, the videos and the logo belong to Cobalt Watch. For any other use, ask us.

Credits

Typefaces: Hanken Grotesk, Martian Mono, Instrument Serif and IBM Plex Sans, under the SIL Open Font License. Photos and videos: Cobalt Watch.

The Android robot is reproduced or modified from work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License.

Accuracy

We do our best to keep this site accurate and up to date. It can still contain a mistake, and we change it as the project moves. If you spot one, tell us.

Applicable law

This site is governed by French law.

Privacy policy

This site sets no cookie and loads nothing from other companies: no analytics, no advertising, no embedded video. So there is no consent banner. Here is the little we do handle.

Who is responsible

Cobalt Watch SAS, the company that publishes this site. For any question about your data, write to jean@cobalt-watch.com.

What we handle

WhatWhyHow longWhere
The e-mails you send usTo answer you. We have a legitimate interest in doing so.Content missingOur mailboxes, at Hostinger
Your e-mail address, if you subscribed to our newsTo send you the news you asked for. This rests on your consent.Until you unsubscribeBrevo, our mailing provider, in France
The server’s logs: IP address, date, page requested, browserTo keep the site running and secure. We have a legitimate interest in doing so.Content missingHostinger, our host
Your name and your e-mail address, if you join the waitlistTo tell you when the campaign opens, and to contact you if you asked to test. This rests on your consent.Until you ask us to remove you, or Content missingA Google spreadsheet, filled by a Google Apps Script

Content missing

Who receives it

Hostinger, which hosts the site and our mailboxes, Brevo, which sends our news, and Google, which keeps the waitlist. We don’t sell your data and we don’t pass it to anyone else.

In your browser

If you switch language with the FR / EN button, your browser remembers that choice so that you get the same language next time. This choice stays in your browser and is never sent to us. Nothing else is stored there.

Your rights

You can ask us for a copy of your data, have it corrected or deleted, object to its use, and withdraw your consent at any time. Write to jean@cobalt-watch.com: we answer within a month.

If you think we handle your data badly, you can lodge a complaint with the CNIL, the French data protection authority.

The app

The Cobalt Agent app has its own privacy policy, because it handles something else: your voice notes. It is on its own page.

Notice about Casio

We are independent. Cobalt Watch is not affiliated with Casio Computer Co., Ltd. or with any of its subsidiaries. Casio has not endorsed or sponsored our products or this website.

The names. “Casio” and “F-91W” are trademarks of Casio Computer Co., Ltd. We use them for one reason only: to say which watch the CB-91AI board is made for. When a Casio watch appears in a photo or a video on this site, it is there to show that compatibility.

What we make. The CB-91AI is an electronic board that we design ourselves. It replaces the board of a watch that you already own. We don’t make the watch, and we don’t sell Casio watches.

Modifying your watch. Fitting the board means opening and modifying your watch. You do it at your own risk. It ends the manufacturer’s warranty on that watch, and we can’t be held responsible for damage done to it while fitting the board.