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Pulsyn

Rune 1

Your data stays on your phone. Full stop.

Sleep, fitness, stress, women's health. All processed on your phone. No subscription. No cloud.

  • E2E Encrypted
  • Free Core Tier

The Pulsyn Way.

Three commitments we made before writing a line of code. We haven't broken them.

  1. 01

    No subscription.

    $160. One payment. The device is yours and so is the software.

  2. 02

    On-device AI.

    A 4B-parameter model runs on your phone. The inference never touches a server.

  3. 03

    Open ecosystem.

    A public API. Connect Rune 1 to Claude, ChatGPT, or whatever you already use.

First production run · 500 units
Pulsyn Rune 1 worn on a hand, finished in titanium

Flagship · Rune Series

Rune 1

Titanium shell, 7-day battery, and a health AI that runs on your phone. No subscription, no cloud dependency.

$160 one-time · USD

No subscription, ever

Available finishes

  • Titanium Silver
  • Obsidian Black
  • Champagne Gold

In the box

  • Pulsyn Rune 1
  • Magnetic charging case
  • USB-C cable
  • Sizing kit
Reserve Your Ring for $10 View full specs

Ships Q3 2026 · 30-day returns · Free worldwide shipping

What it tracks

Health, all day.
Quietly.

Four signals, measured continuously while you get on with your day. Sleep quality, recovery, stress load, cycle health. All on-device.

  1. Sleep Know what happened last night
  2. Fitness Movement, logged without lifting a finger
  3. Stress Stress shows up in the data first
  4. Women’s Health Cycle tracking that doesn’t leave the phone
Sleep

Know what happened last night.

Deep, REM, and HRV tracked across the night. Not a sleep score. The actual data.

Runner mid-stride wearing the Pulsyn ring on a quiet road.
Movement
Fitness

Movement, logged without lifting a finger.

Steps, activity minutes, workout detection, recovery score. Nothing to log manually.

Stress

Stress shows up in the data first.

Continuous HRV catches the physiological signal before you feel it in the usual way.

Person in a calm yoga pose, Pulsyn ring visible on the finger.
Recovery
Women’s Health

Cycle tracking that doesn’t leave the phone.

Temperature-correlated cycle data. Processed on-device. Stays with you.

Privacy · By Architecture

Your body
keeps a diary.

A Pulsyn ring resting on a leather-bound personal journal beside an antique brass key, soft morning light from a nearby window
We don’t get to read it.

Every health data company says this. Pulsyn built it into the architecture so saying it doesn’t matter much either way.

Pulsyn measures forty-seven biological signals every minute. Heart rate. HRV. Sleep stages. Recovery.None of them touch our servers. None of them need to.Your ring talks to your phone, encrypts itself with a key only you hold, and runs every AI inference locally.The journal stays yours. We just made the pen.
  • AES-256
  • SQLCipher
  • On-device AI
  • Open export
Read our privacy commitment

The comparison

Four rings. One clear choice.

On privacy, price, and intelligence: the numbers speak.

No subscription, ever Save up to $360 vs Oura over 5 years

Why Pulsyn Wins

Differentiator
Free Forever
No subscription, ever
Save
$360
vs Oura · 5 yrs
Price
$160
Best value
Privacy
On-Device
Only
AI
Built-In
No cloud
Price Best
Pulsyn Rune 1 $160
Oura Ring 4 $449
RingConn Gen 2 $299
Samsung Galaxy Ring $300
Subscription Best
Pulsyn Rune 1 Free forever
Oura Ring 4 $70/yr (required)
RingConn Gen 2 Free
Samsung Galaxy Ring None required
On-Device AI Best
Pulsyn Rune 1
Oura Ring 4
RingConn Gen 2
Samsung Galaxy Ring
Data Privacy Best
Pulsyn Rune 1 On-device or cloud
Oura Ring 4 Cloud-based
RingConn Gen 2 Cloud-based
Samsung Galaxy Ring Samsung Cloud
Heart Rate
Pulsyn Rune 1 Continuous PPG
Oura Ring 4 Continuous PPG
RingConn Gen 2 Continuous PPG
Samsung Galaxy Ring Continuous PPG
SpO2 Tracking
Pulsyn Rune 1
Oura Ring 4
RingConn Gen 2
Samsung Galaxy Ring
Temperature
Pulsyn Rune 1 Skin temp
Oura Ring 4 Skin temp
RingConn Gen 2 Skin temp
Samsung Galaxy Ring Skin temp
Battery Life
Pulsyn Rune 1 7 days
Oura Ring 4 5–8 days
RingConn Gen 2 10–12 days
Samsung Galaxy Ring Up to 7 days
Water Resistance
Pulsyn Rune 1 5ATM
Oura Ring 4 10 ATM
RingConn Gen 2 IP68
Samsung Galaxy Ring 10ATM / 100m
Weight
Pulsyn Rune 1 2.4–4g
Oura Ring 4 4–6g
RingConn Gen 2 2g
Samsung Galaxy Ring 2.3–3.3g
Materials
Pulsyn Rune 1 Titanium
Oura Ring 4 Titanium
RingConn Gen 2 Titanium alloy
Samsung Galaxy Ring Titanium

Competitor data sourced from official manufacturer websites as of January 2026. Prices, features, and subscription terms may have changed. Pulsyn makes no guarantees regarding competitor accuracy.

Don't take our word for it

Ask AI yourself

We prompted the leading AI assistants to compare us against the competition. See what they said.

ChatGPT ChatGPT

"For privacy-focused users, Pulsyn's on-device approach stands apart."

Ask now →
Claude Claude

"Pulsyn stands out as the only option with true on-device AI and no required subscription."

Ask now →
Perplexity Perplexity

"Pulsyn offers the best combination of price, privacy, and AI features in the smart ring market."

Ask now →

AI responses are generated independently. Results may vary.

Pulsyn · Field Notes Vol. I · Folio 001

A study in calibration.

We’re taking our time with Rune 1. Q3 2026, when it’s ready. We’d rather show you something we’re proud of than ship early and apologise for it.

01

AI runs on your phone

The model, the inference, the insights. None of it touches a server.

02

Seven days per charge

Put it on. Forget about it for a week.

03

No subscription

$160 buys the ring and the software. That's the entire transaction.

Reserve a ring for $10. Explore Rune 1