Coming soon · Kickstarter

Everyone else makes wearables.

We made
jewellery.

Hand-finished sterling silver, plain or 18K gold-plated. Heart, sleep and recovery — tracked quietly. No screen, no account, nothing for sale but the piece itself.

Sterling silver, plain or 18K gold-plated · up to 5 days' battery · no subscription, ever
Concept imagery
01 The Maison

It is not a tracker dressed as jewellery. It is jewellery.

Hand-finished sterling silver, plain or 18K gold-plated: Bra is made the way a bracelet has always been made — to be worn close to the skin, every day, for years. The intelligence lives underneath: heart rate, recovery, sleep and temperature, read without a single glowing screen. You wear a beautiful object. It simply happens to understand you.

Bra in sterling silver on a woven chainConcept imagery
Bra in silver on black woven leatherConcept imagery
Bra gold plated on brown woven leatherConcept imagery
02 The Metals

Sterling silver.
Gilded in gold.

Choose it the way you would choose any fine piece — by how it feels on you, not by a spec. Silver or gold, woven leather or woven chain. One quiet sensor core, four ways to wear it.

Drag to turn · 360° Concept render
Inside · i

A single bar of precious metal.

From the front, nothing but a polished bar on a woven strap. That is the whole point.

Inside · ii

Brushed and finished by hand.

The bar is the jewellery — and the case. Everything else hides beneath it, in roughly 40 × 10 × 4 mm.

Inside · iii

Beneath the silver, it pays attention.

Optical heart-rate, 6-axis motion and skin-temperature sensors, a Bluetooth chip and a small rechargeable cell — up to 5 days between charges.

Inside · iv

Then it closes. Jewellery again.

No screen, no glow. Only a small sensor window on the underside, resting against your wrist.

Concept render
Exploded render of the bracelet electronics under the bar
Under the bar
Macro of the 18K gold-plated bar
18K gold-plated bar
Eyelet and woven chain
Woven chain
Woven leather strap meeting the gold-plated bar
Woven leather
Sensor window on the underside of the bar
Sensor window
03 Quietly Intelligent

Beneath the silver, it pays attention.

Proven wearable sensors — optical heart rate, 6-axis motion and skin temperature — only here it answers to a piece of jewellery, and surfaces only when you ask. No targets. No nagging. No glow by the bed.

Heart & recovery

Resting heart rate and overnight HRV — a gentle read on stress and recovery, measured against your own baseline.

Skin temperature

Nightly deviation from your own baseline — an early hint that something is off, or the rhythm of a cycle.

Sleep & readiness

Sleep stages and quality, breathing rate and a wellness blood-oxygen estimate — turned into a simple morning readiness score, computed on your phone.

5days
Up to, between charges
No screen to feed. A weekly ritual, not a nightly chore.
0
Ads · trackers · buyers
There is no data business behind Bra. None.
100%
On your device
Every reading and every insight is computed on your phone. Nothing leaves by default.
04 Heritage
My father's DOXA · christening gift · 1973 · real photo

In 1973, my father was given a watch at his christening. It still keeps time.

A small DOXA on a black leather strap — a gift from his godfather, given to a baby who would not wear it for years. It never asked to be charged overnight. It never went obsolete. It waited in a drawer, then sat on his wrist, season after season, gathering small scratches and a warmth all its own — until it stopped being an object and became a part of the man who wore it.

I grew up beside that watch. Bra is made to join objects like it: a piece you fasten in the morning without thinking, that earns its patina, and that you might one day hand to someone you love — the way a godfather once did.

— made to be inherited, not upgraded
JurajFounder, Bra
05 On Your Phone

The only screen is the one you already own.

Because the bracelet has none, everything lives in a calm companion app — built around trends, not alarms. And it opens on the thing that matters most.

Private by default. Every reading — and every insight — is computed on your phone, never sent to a server.
No account required. An encrypted backup is optional — and unreadable to us.
Yours to take. Export, delete, or walk away at any moment.
Bra app — privacy
Privacy, first
Bra app — readiness
Your readiness

Nothing for sale
but the piece itself.

No ads

Nothing about you is packaged, profiled or sold. There is no buyer.

No subscription

Every feature is yours the day it arrives. No paywall, ever.

Never for sale

The optional account is encrypted end-to-end — even we can't read it.

06 Specifications
Sensors
Optical heart-rate · skin-temperature · 6-axis motion — proven sensors of the kind used in established wearables
What it reads
Heart rate & HRV · resting-HR trend · sleep stages & quality · skin-temperature trend · wellness SpO₂ · breathing rate · HRV-based stress · recovery readiness · menstrual cycle · activity, steps & calories
Screen & sound
None · no screen and no vibration in the first edition — it stays completely quiet on your wrist
Battery
Up to 5 days · charging dock · holds up to 7 days of summary data offline
Materials
925 sterling silver bar, plain or 18K gold-plated · woven leather (black or brown) or woven chain · hand-finished
Dimensions
Bar approx. 40–44 × 10 × 4.2 mm · working dimensions, may change before production
Water
Splash, sweat & handwash resistant · IP67-class · not for swimming · the leather strap is not waterproof
Privacy
Local-first by default · all analysis and AI run on your phone · optional end-to-end encrypted backup · no account required
Compatibility
iOS & Android · companion app · free lifetime updates
Delivery
Targeting Q2 2027 · pre-launch · reserve when the Kickstarter opens
07 Where We Are

An honest place to start.

Bra is real, and it is early. The electronics already work on the bench; the jewellery is taking shape. Here is exactly where things stand — nothing dressed up as finished.

Development board used for the first Bra prototypeDevelopment board · real photo
Optical heart-rate sensor module used for prototypingHeart-rate sensor module · real photo
i

Sensor core on the bench

Optical heart-rate sensing running on a development board, and our first custom circuit board already streaming motion and skin temperature live to a phone over Bluetooth.

Working on the bench
ii

On-device signal & insights

Turning raw signal into HRV, sleep stages and recovery — all computed locally on the phone, nothing sent to a server.

In progress
iii

Jewellery & miniaturisation

Making the bars in hand-finished sterling silver, plain or 18K gold-plated, and shrinking the electronics to fit a piece you would actually want to wear.

In progress
iv

Kickstarter & tooling

Founder backing opens, production tooling is locked, and the first hand-finished pieces are made.

Planned
v

Delivery to backers

Pieces ship to the people who believed first. We are targeting Q2 2027 and will report progress — the delays included — candidly.

Targeting Q2 2027
08 Launch Pricing

Reserve your metal.

When the Kickstarter opens, founders reserve these prices first. Every piece ships with the charging dock and lifetime app access — no subscriptions to follow.

Early Bird
€99
Silver · Black Leather
The Silver · Black Leather piece at the founders' price, for the quickest hands.
Limited to 100 backers
Silver · Black Leather
€129
925 sterling silver bar · black woven leather
A sterling silver bar on soft black leather. Quiet enough for every day, sharp enough for a suit.
Unlimited
Our signature
Silver · Woven Chain
€149
925 sterling silver bar · woven chain
Sterling silver from bar to clasp, with real weight on the wrist. Formal enough for any room.
Unlimited
Gold · Brown Leather
€159
18K gold-plated sterling silver bar · brown woven leather
A gold-plated bar on warm brown leather — the one that looks like it has always been yours.
Unlimited
Gold · Woven Chain
€179
18K gold-plated sterling silver bar · woven chain
Sterling silver under warm 18K gold plating, bar and chain alike. The everyday luxury.
Limited to 200 backers
The Pair
€249
Any two of the first three designs
Two of Silver · Black Leather, Silver · Woven Chain or Gold · Brown Leather — for two people who'd rather keep their data, and each other.
Unlimited · Gold · Woven Chain not included

Pricing shown for founder backers · final retail will be higher · shipping is charged separately through BackerKit after the campaign.

09 Before You Reserve
Is it really jewellery, or a tracker in disguise?+
It's jewellery. The bar is hand-finished sterling silver, plain or 18K gold-plated, like any fine piece. The sensors are hidden against the skin so that nothing about the design announces "wearable." You could wear it to a wedding and no one would know it was smart.
Where does my data actually live?+
On your phone. Bra is local-first: every reading syncs straight from the bracelet to your device and stays there by default — there is no cloud account holding your health data. If you want a safety net, you can switch on an optional backup that is encrypted end-to-end, so even we cannot read it. You hold the key, and you can turn it off or delete everything at any time.
Does the analysis or AI send anything to a server?+
No. All of the analysis — HRV, sleep staging, stress, recovery readiness — runs on your phone. Nothing about your body is uploaded to be processed, and nothing is used to train anything. Keeping the intelligence on-device isn't a limitation here; it's the whole point.
Does it vibrate? Does it have a screen?+
No to both — and that's deliberate. There is no screen, and the first edition has no vibration motor, so it never buzzes and has nothing to glow at you. It stays completely quiet on your wrist; everything it notices waits for you in the app.
Can I swim or shower with it?+
It's splash, sweat and handwash resistant (IP67-class), so everyday water and a shower are fine. It is not designed for swimming, and the leather strap should be kept dry. The woven-chain pieces handle water far better than leather.
Is this a medical device?+
No. Bra uses proven wearable sensors, but it is a wellness companion, not a medical instrument — it hasn't been validated against medical references and doesn't quote diagnostic accuracy. Heart rate, HRV, skin-temperature trend and a wellness blood-oxygen estimate help you notice change early; they don't diagnose, and they don't replace a clinician.
How much is shipping?+
Shipping isn't included in the pledge. It's charged separately after the campaign ends, through BackerKit — once we know your address and the final carrier costs for your country. Pledges are €99 to €249 depending on the piece; shipping is added on top at that point.
When can I buy one?+
Bra is pre-launch. The sensor core works on the bench and the design is taking shape, but we aren't taking orders yet — we're preparing a Kickstarter and targeting delivery to backers in Q2 2027. Leave your email and you'll be the first to know when reservations open. No spam, just the launch.
Coming soon · Kickstarter

Wear your health.
Keep it yours.

Launch date and sign-up coming soon.