SparkRing Smart Ring
Knows you.
Quietly.
Sleep, heart rate, HRV, stress and mood,
recorded the moment you put it on.
- 2.6gAs light as
- 2.3mmAs thin as
- 7daysBattery, up to
- 5ATMWater resistant
One ring that keeps an eye on how your body is doing
Your health, in hand.
Sleep
See how
you really slept.
It notices when you fall asleep and wake up, stages your night, and adds overnight heart rate, HRV and SpO2,
so you know at a glance how the night went.
- Deep · Light · REM · Awake
- Bedtime and wake time
- Report when you wake
- Overnight heart rate
- Overnight HRV
- Overnight SpO2
- 30-day comparison
Daily recovery
Know how ready
you are, every morning.
Last night’s sleep, resting heart rate, HRV and temperature become a recovery score from 0 to 100 each morning, so you can decide whether to push today or take it easy.
- RecoveryHow ready your body is
- Sleep scoreDuration, efficiency and structure
- TemperatureCompared with your own baseline
- Bedtime adviceBased on your own rhythm
Heart rate and HRV
Every beat,
on the record.
Heart rate is measured automatically every 5 minutes, all day, and you can check it any time. Overnight HRV reflects recovery and strain, and its trend tells you the most.
- 5minbetween heart-rate readings
- 24hcontinuous, day and night
- 4viewsday · week · month · year
Mood and stress
It feels the tension
before you do.
Built on our own PPG algorithms, it combines heart rate, HRV and movement to tell when you’re tense and when you’ve settled. Stress is visible all day, and when you feel wound up, a guided breath is one tap away.
- Mood detection
- All-day stress
- Time stressed and relaxed
- Look back by hour
- 26 breathing rhythms
Meet Rongrong
How you feel,
on its face.
Rongrong changes with you in real time: happy when you’ve rested well, tense when you’re stressed, sleepy late at night. No numbers needed, just look at it.
Calm
Happy
Tense
Sleepy
Resting
Asleep
Everything it does
One ring.
All of it.
- Sleep stagesFour stages
- Heart rateEvery 5 minutes
- Overnight HRVRecovery and strain
- MoodTense or calm
- StressAll-day curve
- SpO2Measured as you sleep
- TemperatureAgainst your baseline
- Steps and caloriesDistance and active time
- WorkoutsDetected automatically
- Breathing26 rhythms
- CycleTracking and prediction
- Data exportCSV and JSON
Activity
Move, and it’s logged.
Steps, calories, distance and active time add up on their own. Walks and runs are recognised automatically, and you can log a workout by hand.
Cycle
Care for every cycle.
Log your period, flow, symptoms and mood. Overnight temperature helps predict the next one.
Four finishes
Goes with everything.
Silver
Barely there
Sleep in it.
Forget it’s there.
A one-piece CNC-milled brushed metal shell with a low-allergy epoxy inner surface. It sits close, resists wear, and is comfortable day and night.
- 2.6gweight (size 7)
- 2.3mmthickness
- 6.08mmwidth
- One-piece CNC
- Brushed metal
- Fingerprint resistant
- Scratch resistant
- Low-allergy inner
A week on a charge
Up to 7 days of battery. A magnetic dock with USB-C, an estimate of days left, and a reminder when it runs low.
5ATM water resistance
Wash your hands, shower or swim with it on. Wear it all day without gaps in your data.
Sensors where they count
Optical heart-rate and SpO2 sensor, skin temperature and a 3-axis accelerometer, on an nRF54L15 chip with Bluetooth 5.4.
Your data stays yours
Your health data is kept on your own phone. Export it as CSV or JSON, or delete it, whenever you like.
Find your size
Eight sizes.
One just right.
We recommend your index or middle finger. Fingers swell during the day, so if you’re between sizes, go up one. If you’ve worn another popular smart ring, such as Oura or Galaxy Ring, pick the same size.
- Wrap a thin strip of paper or string around your finger, snug but not tight
- Mark where it meets and measure the length flat
- Divide by 3.14 for the inner diameter, then match it to the chart
Size · inner diameter
- 616.5mm
- 717.3mm
- 818.1mm
- 918.9mm
- 1019.8mm
- 1120.6mm
- 1221.4mm
- 1322.2mm
SparkRing
Tech specs
- Weight
- 2.6 g (size 7)
- Dimensions
- 2.3 mm thick · 6.08 mm wide
- Sizes
- US 6–13
- Finishes
- Silver · Gold · Black · Rose Gold
- Materials
- One-piece CNC-milled brushed metal · epoxy inner
- Water
- 5ATM
- Battery life
- Up to 7 days
- Battery
- 16 mAh (13 mAh on sizes 6 and 7)
- Charging
- Magnetic dock · USB-C
- Sensors
- Optical HR and SpO2 · temperature · 3-axis accelerometer
- Chip
- nRF54L15
- Connectivity
- Bluetooth 5.4
- App
- Android (iOS coming soon) · no subscription
- In the box
- Ring · magnetic dock · USB-C cable · quick start guide
Get the SparkRing app
Pair your ring. Every feature is free, with no subscription.
No ring yet? Install it and tap “先体验一下” (Try it first) to explore with simulated data.
- Tap the button above to download
- Open the file and allow “Install unknown apps” when asked
- Open SparkRing, put on your ring, and follow the pairing guide
Scan to download
Use your phone’s camera or browser
SHA-256 e014e93d0f9cd66249b7541e67ec61fa59a54de66e64e13336a08ac3e1438e5f