Coach de football américain - avis après 3 mois
As a performance coach, I stopped guessing my players’ recovery levels. Jycen’s daily HRV, sleep and strain insights let me adjust training instantly — and prevent injuries before they happen.
Simple. Intelligent. Powerful.
Visualize your health as a whole
With 24/7 monitoring of your sleep, workouts, stress and heart health, JYCEN offers you a complete view of your health.

Assess your recovery level
Your body is speaking to you. JYCEN translates.
Analyze how your body reacts to your workouts, stress, or lack of sleep.
JYCEN calculates your daily recovery score (0-100) to help you adjust your efforts and avoid overtraining.
✓ Daily recovery score based on HRV, resting heart rate and sleep quality
✓ Personalized AI recommendations: "Ideal day for intense training" or "Prioritize recovery"
✓ Weekly trends to track your progress
“Before JYCEN, I trained 6 days a week without listening to my body. Now, I know exactly when to push and when to recover. Zero injuries in 6 months.” – Sophie R., CrossFit athlete

Optimize your sleep
Sleep is the foundation of everything. Master it.
JYCEN analyzes your sleep phases (light, deep, REM), detects micro-awakenings, and measures your body temperature during the night. The AI suggests optimal bedtimes and personalized routines.
✓ Detailed analysis of the 4 sleep phases with minute-by-minute graphs
✓ Sleep score (0-100) based on duration, efficiency and stages
✓ Smart recommendation: "Go to bed between 10:15 pm and 10:45 pm to maximize your recovery"
✓ Detection of accumulated sleep debt
💤 JYCEN users increase their deep sleep time by an average of 27% after 30 days.

Reach your goals faster
Turn every workout into measurable progress.
JCVital guides your workouts with precise metrics: integrated GPS, calorie expenditure, distance, time, heart rate zones, and a complete history. Choose your activity (running, cycling, swimming, basketball, weight training, yoga, etc.), start the session, and find all your metrics in one place.
✓ 80+ sports activities tracked automatically or manually
✓ Real-time heart rate zones (warm-up, fat burning, cardio, threshold, max)
✓ Accurate calculation of calories burned based on your metabolic profile
✓ Built-in GPS for running/cycling with route map
✓ Strain score (0-21): measure the intensity of each session

Manage your stress in real time
Invisible stress destroys your performance. Detect it before it's too late.
JYCEN monitors your stress levels via respiration, HRV and body temperature.
AI guides you with breathing exercises or micro-interventions to effortlessly return to calm. Your index balance shows the equilibrium between stress and recovery.
✓ Continuous stress monitoring (score 0-100)
✓ Real-time detection of stress spikes with alerts
✓ Guided breathing exercises integrated into the app
✓ Balance index: balance between activity and recovery
📊 73% of JYCEN users report a significant reduction in their stress after 60 days.

Stay connected to your heart health
Your heart is your engine. Watch it closely.
Monitor your heart rate 24/7, your heart rate variability (HRV) and your exercise load
throughout the day. Receive alerts when your body shows signs of fatigue, imbalance, or heart abnormality.
✓ Resting heart rate (RHR): a key indicator of your fitness
✓ HRV (Recovery and Resilience Volume): a measure of your capacity for recovery and resilience to stress
✓ SpO2 (oxygen saturation): monitoring your blood oxygenation
✓ Irregular heart rhythm alerts
✓ Trends over 7/30/90 days

Synchronize your day with your biorhythm
What if you lived in harmony with your body?
Using your personal data (sleep, HRV, temperature), JYCEN identifies your peaks.
natural energy sources and indicates the best times to move, concentrate, sleep, or slow down. Your days become smoother, your energy more stable.
✓ Predictions of optimal energy windows
✓ Recommendations for planning your important tasks
✓ Detection of your chronotype (early bird, night owl)

Better understand your cycle
Your cycle influences everything: energy, performance, recovery.
JYCEN detects the physiological variations related to your menstrual cycle (temperature,
HRV, heart rate). Receive personalized advice on sleep, exercise and nutrition tailored to each phase.
✓ Prediction of your cycle phases based on your biomarkers
✓ Tailored training advice (follicular, ovulation, luteal, menstruation)
✓ Monitoring of symptoms and patterns
✓ Custom notifications
“Understanding my cycle has changed everything. I now know why some weeks
I feel invincible, while others feel exhausted. I adapt my training and nutrition.
Revolutionary.
- Amélie D., Marathon runner
Whoop gives you data.
Jycen gives you data AND solutions.
Our transdermal performance patches deliver active ingredients through the skin naturally improving sleep, focus and calm.

FOCUS+ (Day Mode)
Your natural morning starter.
Caffeine 30mg • L-Theanine 100mg • Ginseng • Vitamin B12 • Lion's Mane • N-Acetyl-L-Carnitine
✓ Sustained mental energy without a caffeine crash
✓ Laser concentration for 6-8 hours
✓ Perfect for productive mornings or before training
When : In the morning or before your intense work blocks
Duration : 6-8 hours (start shorter if sensitive to caffeine)

CALM+ (Anytime Mode)
Your on-demand anti-stress shield.
Ashwagandha KSM-66 • Rhodiola • Passionflower • L-Theanine • Magnesium
✓ Reduces anxiety and cortisol
✓ Improves resilience to stress
✓ Promotes a state of calm without drowsiness
When : During periods of stress (often afternoon/evening)
Duration : 8-10 hours

SLEEP+ (Night Mode)
Your nightly reset for maximum recovery.
Melatonin 3mg • L-Theanine • Magnesium • Valerian • Passionflower • Chamomile • Lavender
✓ Faster sleep onset (15-30 min)
✓ Prolonged deep sleep
✓ Wake up without feeling groggy
When : 30-60 minutes before bedtime
Duration : 8-10 hours (remove upon waking)
No need to choose between tech, science or wellness.
An App That Understands Your Body. Better Than You Do.
AI transforms your biometrics into daily recommendations.
Push or rest. Sleep or perform.
No more guessing.























JYCEN 4.0 - The health watch that helps you understand your body
Écoutez vos signaux, évitez le surmenage et optimisez votre énergie au quotidien. Sans distraction. Sans abonnement.
Description
JYCEN 4.0 is a screenless health bracelet connected to the JCVital app. It continuously tracks your key signals (sleep, heart rate, estimated SpO₂, HRV, activity) and transforms this data into simple recommendations using an AI coach. With your purchase, you receive three free packs of SINNIO transdermal patches (Sleep+, Calm+, Focus+) to support sleep, stress management, and concentration. No subscription required. JYCEN is not a medical device.
For whom?
- People who want to sleep better, recover and stabilize their energy on a daily basis.
- Students, entrepreneurs, athletes who want to concentrate without distractions.
- Users who prefer discreet tracking (screen-free) with actionable advice.
- Anyone who wants clear routines for sleep, stress, and focus.
- Not suitable for diagnosing, treating or preventing any disease. Consult a healthcare professional if needed.
Technical specifications
AUTONOMY
- 7-10 days of continuous use
- Full charge in 2 hours
- Long-lasting lithium-ion battery
DESIGN & COMFORT
- Interchangeable strap (Nylon, Silicone, Rubber)
- Casing: Zinc alloy, Stainless steel, Metal
- IP68 waterproof: Swimming, showering, sweating - no worries
MEDICAL SENSORS
- Optical heart rate sensor (PPG)
- Heart rate variability (HRV) sensor
- Pulse oximeter (SpO2)
- 3-axis accelerometer
- Gyroscope
- Body temperature sensor
- Stress sensor (via skin conductance)
CONNECTIVITY
- Bluetooth 5.0
- Compatible with iOS and Android
- Manual synchronization with the JCVital app
- Built-in GPS for outdoor activities
- Compatible with Apple Health
Patch ingredients
FOCUS+ (day)
- Caffeine 30 mg
- L-theanine 100 mg
- Ginseng (10% ginsenosides) 80 mg
- Vitamin B12 (methylcobalamin) 500 µg
- Lion's Mane 100 mg
- N-acetyl-L-carnitine 50 mg
CALM+ (at any time)
- Ashwagandha KSM-66 (5% withanolides) 120 mg
- Rhodiola (3% rosavins, 1% salidroside) 100 mg
- Passionflower 100 mg
- L-theanine 100 mg
- Magnesium citrate (elemental) 40 mg
SLEEP+ (night)
- Melatonin 3 mg
- L-theanine 100 mg
- Magnesium citrate (elemental) 60 mg
- Valerian 5:1 80 mg
- Passionflower 80 mg
- Chamomile (apigenin) 2 mg
- Lavender essential oil 1 mg
Other (all patches) : menthol, oleic acid, terpenes (for absorption).
Without 5-HTP / tryptophan.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekends.
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Frequently Asked Questions
Is there a monthly subscription?
No! Unlike some competitors who charge $25-30/month, the JCVital app is FREE FOR LIFE with the purchase of your JYCEN bracelet. You pay once, you enjoy it forever. All features (AI, reports, analytics) are included with no hidden fees.
How does AI work? Is it truly personalized?
Artificial intelligence analyzes your physiological data and habits to recommend personalized routines (sleep, training, recovery, focus, etc.). The more you use it, the more accurate it becomes.
What is the battery life of the bracelet?
The bracelet lasts up to 10 days on a single charge. It fully recharges in less than 60 minutes.
Does it work abroad?
Yes, JYCEN works in all countries. The app is available in English and French. Data is synchronized via Bluetooth.



