Meet Vena

Track your health with the watch you love.

A sensor small enough to disappear under the analog watch you already own. It tracks your heart rate, sleep, and recovery, and sends it all to your phone.

See how it works
$2 refundable deposit · Ships Q4 2026 · 30-day refund
A wrist wearing an analog watch, the green sensor glow just visible beneath the caseback
Hidden by design

It lives between your watch
and your wrist.

No new watch. No band, no ring. Vena sits against the back of the watch you already wear, hidden against your skin.

How it reads you

Optical sensing, hidden under your watch.

Vena uses a multi-wavelength PPG sensor to read pulse signals through your skin, the same core sensing technology used by modern wearables. It continuously tracks heart rate, HRV, sleep, and recovery while remaining completely hidden.

Macro of the Vena optical sensor with green and amber LEDs
A day with Vena

Analog watches tell time beautifully.
Wearables tell you about your body.
Vena does both.

A person checking their analog watch
The Vena app showing heart rate, sleep and HRV
The Vena sensor glowing on a dark surface
Heart rate · Sleep · Recovery
The Vena sensor held between two fingers, 1.6mm thin
1.6 mm thin
The Vena sensor on its magnetic charging cradle
5 to 7 days battery life
How it compares

Built for the watch you already love.

VenaSmartwatchSmart ringFitness band
Keep the analog watch you love✓✕✓✓
Nothing new to wear✓✕✕✕
Hidden from view✓✕✕✕
No subscription✓✓✕✕
Continuous health tracking✓✓✓✓
One-time purchase✓✓✕✕
The Vena sensor, top view with the embossed logo
Pre-orderFirst batch · limited

Be among the first to wear Vena.

Keep your watch. Track your health.

Works with
Any analog watch you own
Tracks
Heart rate, HRV, sleep, SpO₂
Battery
5 to 7 days per charge
Subscription
None, ever
Ships
Q4 2026, first batch
$69.69one-time

The $2 deposit is fully refundable and holds your unit. You pay the balance only when it ships — cancel anytime.

FAQ

Questions, answered honestly.

Will it work with my watch?

Vena is built to pair with the analog and mechanical watches you already own. We confirm compatibility for your specific watch before your batch ships, and if it doesn't fit, you get a full refund.

How accurate is the data?

Vena uses a multi-wavelength optical sensor sampling at 100 Hz, the same sensing approach used in modern wearables. We're validating accuracy against reference devices now and will publish the results before the first batch ships.

Will it scratch my watch?

No. The watch-facing side is a soft, polished polymer and the skin-facing side is soft silicone. There is no metal-on-metal contact with your watch.

Battery life?

Five to seven days per charge under normal use. Charging is a magnetic cradle, about fifteen minutes for a full top-up.

What does it cost?

The founding batch is $2, a limited early price for the first wave. Final retail pricing will be confirmed closer to launch.

When does it ship?

The first batch ships Q4 2026. Waitlist position is honored in the order you joined, and early members get the first units.