Finally, no monthly fee
I switched from a smart ring purely because of the subscription. The sleep staging is at least as good, the battery lasts my whole work week and the app doesn't nag me.
Introducing Nurnex Earring
Know your body.
Own your day.
The titanium smart earring that turns sleep, readiness, stress and heart data into one clear plan every morning. Core insights are free forever — no subscription, no strings.
- No subscription required
- 30-night home trial
- 2-year warranty
- One size, no sizing kit
14K Gold · $379
- Battery, one charge
- 8days
- Lighter than a stud
- 2.1g
- Water resistant
- 100m
- Core insights, forever
- $0/mo
What it tracks
Everything your body is telling you, in one place.
Twenty-plus biometrics measured from the earlobe, distilled into three daily scores and a handful of insights you will actually use.
Design
Compare all finishesMade to disappear.
Jewellery first, computer second. A sculpted titanium hook in front, a clear sensor back behind the lobe — nothing to catch, nothing to feel.
The signature. Warm 14K gold bonded to titanium under a ceramic seal that will not chip, tarnish or fade.
Grade 5 titanium14K gold ceramic plating2.1 g100 m water resistantSensor back, one size5 finishes
Smart sensing
Sensing that adapts to you.
Every lobe is different. Nurnex measures the quality of its own signal and re-tunes the sensors, all night, all day.
- Optical sensors · palm side
- Temperature ×3
- Battery cell
01
Multi-path optical
Red, infrared and green LEDs read pulse, oxygen and blood-flow from three angles, so a loose fit or a cold hand does not cost you a night.
02
Three temperature sensors
0.01 °C resolution, sampled every minute. Enough to see a cycle phase shift, a fever brewing, or a late glass of wine.
03
Six-axis motion
Accelerometer and gyroscope detect sleep micro-movements, steps and forty workout types without a single tap.
04
Adaptive sampling
The earring spends power where the signal is: high during workouts and sleep transitions, low when you are still. Eight days, one charge.
Tuesday · 7:02
Good morning, Lin.
84
79
62
Morning brief
Solid recovery: HRV is 9 % above your baseline and temperature is steady. A good day for the interval session you planned.
Last night7h 41m · 93 %
RHR
52
HRV
64
Temp
+0.2
The Nurnex app
Less dashboard. More decisions.
Four tabs. No badges, no streak guilt, no 40-screen onboarding. The app is designed to be closed.
Nurnex Coach · included with Nurnex+
Ask your data anything.
Most apps show you a chart and wish you luck. Coach explains why the number moved and what to do before lunch.
- Reads your full history, not a snapshot — every night since day one.
- Cites the metric behind every claim so you can check its reasoning.
- Runs two-week experiments and reports “no difference” when that is the truth.
- Never trains on your data for anyone else. On-device first.
Sample conversation
Why did my readiness drop to 61 today?
Two things. Your resting heart rate was 6 bpm above baseline all night, and you fell asleep 1h 40m later than usual after the flight. HRV recovered by 4am, so this looks like travel, not illness.
Want me to lower today's activity target and move your bedtime window earlier for the next two nights?
Yes, do that.
Pricing
One price. No monthly ransom.
Your body's data should not come with a subscription. Nurnex Core ships with every earring and never expires. Nurnex+ is optional — and easy to leave.
Included forever
Nurnex Core
$0
per month, always
Included with every earring. Forever. No card on file.
- Sleep, Readiness & Activity scores
- Sleep stages, timing and efficiency
- Resting heart rate & HRV trends
- Body temperature trends
- Workout heart rate & auto-detection
- Cycle tracking & period prediction
- Unlimited history, export any time
Optional
Nurnex+
$4.99
per month · $49/yr
Optional. Deeper, forward-looking insights and your AI coach.
- Nurnex Coach — AI that reads your data
- Cardio Capacity (VO2 max) & Cardiovascular Age
- Cumulative Stress & Resilience
- Symptom Radar illness early-warning
- Chronotype & bedtime guidance
- Pregnancy & perimenopause insights
- Glucose & meal integrations
- Guided breathing, sleep sounds, meditations
See everything in Nurnex+
Three months included with every earring.
Transparent total cost
What a smart wearable really costs over three years
- Nurnex Earring$299
- Oura Ring 4$565
- Ultrahuman Ring Air$349
- Samsung Galaxy Ring$399
Device price plus any required subscription over 36 months, at public list prices (Sept 2026). Optional add-ons excluded.
Readiness actually changed how I train
Three weeks in, the Readiness score predicted a cold two days before I felt it. I backed off, and it never really landed. Worth it for that alone.
Beautiful, light, one small wish
The gold is gorgeous and genuinely feels like jewellery. I wear it on the side I don't sleep on and forget it is there.
Cycle predictions are eerily good
Temperature-based period prediction has been within a day for four cycles. The phase-aware Readiness is the feature I didn't know I needed.
Science & research
Read our researchValidated, not vibes.
We publish the protocol before we publish the number, and we report accuracy where it is hardest — per stage, per activity, per skin tone.
- 01
Measured against the reference, not the competition
Sleep against polysomnography. Heart rate against chest-strap ECG. Temperature against clinical thermometry. We publish the protocol before we publish the number.
- 02
Per-stage, per-person, per-skin-tone
Averages hide failures. We report accuracy by sleep stage, by activity type and across the Fitzpatrick skin-tone scale, and we keep improving where the signal is hardest.
- 03
Open scoring
Every score has a contributors page that shows what moved it and by how much. No black boxes, and no surprise algorithm changes without a changelog.
- 04
Wellness, not diagnosis
Nurnex is not a medical device. We say clearly what it can and cannot detect, and we design alerts to send you to a clinician, not to replace one.
Nurnex for Business
Healthier teams, measured honestly.
Earrings for your people, aggregated insights for you, and privacy rules that mean nobody ever sees an individual's night.
Nothing to size
One post, one size. Fits on day one.
No sizing kit, no waiting. A 0.8 mm post with a push-on sensor back fits any standard lobe piercing. The hook hangs in front; the sensor sits behind.
Every morning, one clear plan. Starting tomorrow.
Thirty nights to decide. No sizing, free shipping, free returns — and nothing to cancel later.