Hold it, shake to start
No app to open, no voice, no setup.
A breathing break for the stress that builds all day.
Turn a busy moment into a breathing break. Feel moonbird expand and contract in your hand, and breathe along. No counting needed. Open the app whenever you want to see your heart rate.
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Color: Soft White
Handheld device with heart rhythm sensor and tactile breathing guidance
Exercise customization to match your goals and preferences
Biofeedback and insights on every session
Wearable connection: Oura, Apple Health & Google Health
Personalized breathing pace tuned to your unique physiologyPremium
Aura, your AI breathing coach, with real-time guidance and soundscapesPremium
Advanced insights, including a tonight's-sleep predictionPremium
Delivery in 1-8 business days
30-day trial period
100% money-back guarantee
Free shipping, free returns
Stress, breathing and cortisol
Cortisol helps your body respond to stress. But feeling stressed does not mean your cortisol is too high. So what do we know about breathing and cortisol? Endocrine Society.
What changed after 8 weeks?
The breathing group had lower cortisol. In the group without training, the change was too small to rule out chance.
With breathing trainingWithout breathing training
This study did not test moonbird. Lower cortisol does not necessarily mean less stress. Results across studies vary.
Approximate averages from the published graph. Ma et al., 2017.
Study details
20 supervised sessions over 8 weeks: 15 minutes of belly breathing and 15 minutes of rest each time. The chart compares measurements taken before the first and last sessions. Lines connect those two points; they do not show measurements in between.
Values are read from Figure 5. Error bars, which show uncertainty, are omitted. The authors could not establish whether the decrease provided a health benefit.
Adapted from Figure 5, Frontiers in Psychology 8:874. © 2017 Ma, Yue, Gong, Zhang, Duan, Shi, Wei & Li. CC BY 4.0.
Feel the rhythm. See your heart rate.
Follow the movement in your hand. The app shows your heart rate while you breathe. These readings do not measure cortisol.
A pace that fits you
The app learns from your sessions and adjusts your breathing pace.
A rhythm you can feel
Put your phone aside and follow the movement in your hand. No counting, no timer to watch.
Watch your heart rate
See your heart rate as you breathe. Review your session afterwards.
A pace that fits you
The app learns from your sessions and adjusts your breathing pace.
A rhythm you can feel
Put your phone aside and follow the movement in your hand. No counting, no timer to watch.
Watch your heart rate
See your heart rate as you breathe. Review your session afterwards.
How it works
Breathe along
It expands, you breathe in. It contracts, you breathe out. Slow and gentle, nothing to count.
See your heart rate
Open the app to follow your pulse.
Make room for a pause
Take a break at your desk or between meetings.
Review your session
See your heart-rate patterns in the app.
Aura learns
Your breathing coach adapts as it gets to know you.
A moment for yourself
Stress
Keep moonbird at your desk. When the afternoon gets busy, pick it up for a guided breathing break.
Focus
Before your next task, pause and follow the rhythm in your hand.
Anxiety
When things feel overwhelming, there is no counting to do. Just breathe along.
Sleep
Use moonbird without a screen as part of your evening routine.
Everything you need to build a practice that sticks
The device
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Heart rhythm sensorOptical PPG sensor measures heart rate and HRV in real time
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Tactile breathing guidanceExpands and contracts in your hand to guide your rhythm
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Soft, skin-safe siliconeDesigned to feel natural in your hand
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2-hour battery lifeRechargeable via magnetic charging cable
In the box
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Moonbird breathing coach
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Magnetic charging cable
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Protective pouch
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Quick start guide
The app
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Breathwork contentLearn why it works and how different techniques affect your nervous system
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Library of breathing exercisesStandard exercises with spoken coaching and tactile guidance
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Exercise customizationChoose your own pace, connect your device for in-session data
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Wearable connectionOura, Apple Health & Google Health for sleep, HRV, and recovery data
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Biofeedback and insightsIn-session metrics, real-time biofeedback, and health trends over time
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AuraPremiumAura interacts with you in real time, combined with soundscapes matched to your mood
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Personalized breathing pacePremiumDiscovers your optimal rate for relaxation, focus, and sleep; every session adapts to your body
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Advanced insightsPremiumDetailed HRV, breathing-heart sync, recovery scores, and a prediction of how well you'll sleep tonight
What the research says
In a study of 40 healthy adults, the breathing group had lower cortisol after eight weeks. The control group showed no significant change. Ma et al., 2017.
Findings across studies vary. This study tested breathing exercises, not moonbird.
Research on moonbird
79%
Preferred moonbird over a competitor device
Honinx et al. 2025, peer-reviewed.
37%
Better subjective sleep quality after one month, in adults with sleep problems
Vermeylen et al. 2022, peer-reviewed.
Moonbird measures, intervenes, and adapts. That's how it closes the loop.
 | Breathing apps | Passive VNS devices | Wearables | Therapy | Medication | |
|---|---|---|---|---|---|---|
| Tactile, intuitive guidance | ✓ | - | - | - | - | - |
| Portable (anywhere, anytime) | ✓ | ✓ | ✓ | ✓ | - | ✓ |
| 100% natural | ✓ | ✓ | ✓ | ✓ | ✓ | - |
| Biofeedback and insights | ✓ | - | - | ✓ | - | - |
| Immersive, multi-sensory experience | ✓ | - | - | - | ✓ | - |
| Data-driven personalization | ✓ | - | - | - | - | - |
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Common questions
There are promising findings. In one small study, adults who practised guided belly breathing over eight weeks had lower cortisol after training. Other studies found no clear difference, so these findings do not establish that moonbird lowers cortisol. Moonbird gives you a practical way to make time for breathing: hold it, follow its movement and practise without counting or watching a screen.
Of course you can breathe without a device. Moonbird adds a gentle rhythm you can feel, so you do not have to count breaths or keep checking a timer. Keep it at your desk for a pause between tasks. If you want feedback, the app shows your heart rate while you breathe. Try it in your own routine with a 30-day money-back guarantee.
You feel the guidance in your hand. Moonbird gently expands and contracts, giving you a rhythm to breathe along with. You can keep your eyes closed and your phone aside. When you want more guidance, open the app for exercises and heart-rate feedback, or choose Premium for Aura coaching and a breathing pace that adapts to you.
No. Hold moonbird, give it a gentle shake and follow its movement. That is enough to start a breathing break. The app is there when you want to choose exercises, adjust your settings or see your heart rate. You decide how much guidance you want.
The basic app includes breathing exercises, your own settings and heart-rate feedback. Premium adds Aura, your interactive breathing coach, a pace that adapts to you and more detailed insights. You can use moonbird on its own or with the basic app without a Premium subscription.
With Premium, the app learns from your sessions and adjusts the breathing pace to you over time. You can follow the rhythm in your hand without working out the timing yourself. The basic app also lets you choose your own breathing settings.
Most sessions last 2 to 10 minutes. Start with a length that fits your day: before a meeting, between tasks or during an afternoon break. You do not need to clear your schedule to make room for a breathing practice.
Yes, you can cancel anytime. Your subscription will remain active until the end of the current billing period, and you'll keep full access to the basic app with all its features after that. There's no lock-in.
You can return moonbird for free within 30 days. No questions asked.
Make space for a breathing break.
Find out how a breathing break fits your day. Try moonbird at home for 30 days, with free returns and a money-back guarantee.
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