Smartbuds use clinical-grade EEG sensors to work with your brain while you rest—detecting your sleep stages in real time and delivering gentle sound pulses to deepen your most restorative sleep stage.
Every SmartBuds purchase includes a complete Fit Kit:
All 3 sizes of ear tips and wings included in the box
Find your perfect fit right out of the box
No subscription required
Smartbuds require an iPhone 12 or newer running iOS 17+.
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Smartbuds use 6 clinical-grade EEG sensors to monitor your brain’s activity in real time.
When Smartbuds detects certain shifts in brain activity, adaptive sounds are played to nudge you back to the ideal state.
While in N3 deep sleep, your brain is consolidating memories to long term storage, your body is recovering, and your brain is detoxifying. Smartbuds detect when you’re in N3 deep sleep and provide audio stimulation to boost the effects of N3 deep sleep.
When in a Relax or Focus session, listen to the audio shift in real-time in response to your brainwaves and movement. Falling out of focus? Smartbuds gently nudge you closer to that flow state and remind you when you’re getting off track.
Smartbuds capture sleep, relax, and focus data in exceptional detail, enabling deeper, actionable insights. Don’t just see how well you’re sleeping, but see and feel how Smartbuds is actively improving your sleep.
Smartbuds use Tecticoat®, an industry-leading dry electrode material. Every month, get a new set of comfortable tips and wings sent to your door to keep signal strong and clean.
Your Smartbuds combine brain sensing with science-backed sounds to help you rest better. Let’s dive into how it works.
Your brain generates bursts of electrical activity—called brain waves—that change shape as you progress deeper into sleep.
As you fall asleep, Smartbuds track these shifts with in-ear EEG sensors.
These deep, low-frequency waves appear when your brain enters recovery mode, supporting memory, cellular repair, and other critical processes.
Smartbuds play gentle pink noise pulses that sync with your brain’s natural rhythms, deepening slow waves for better sleep quality.
During deep sleep, the brain generates slow waves—rhythmic pulses that signal your brain and body are recovering. Smartbuds enhance these waves with sound to improve sleep quality. Here’s how.
Throughout the night, Smartbuds monitor your brainwaves in real-time. As your brainwaves shift, Smartbuds detect these shifts and recognize when you enter slow wave sleep.
When in slow wave sleep, Smartbuds play audio in sync with your brain rhythms to increase slow wave activity.
Experience what efficient sleep feels like. Sharp focus, sustained energy, and the satisfaction of knowing you’ve maximized every minute of rest.
With over a decade of collaboration with leading research institutions, NextSense has supported numerous IRB-approved studies and contributed to peer-reviewed publications. Our work is guided by a team of scientific advisors who are pioneers in neuroscience, sleep research, and human performance.
| NextSense Smartbuds | Ozlo Sleepbuds | Soundcore A20 | Oura Ring | |
|---|---|---|---|---|
| Tracking Type | EEG (Most Accurate) | None | None | ECT + Movement |
| EEG |
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| Deep Sleep Enhancement |
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| Clinical Validation |
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| Pause Audio When Sleeping |
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N/A |
| Low-Energy Bluetooth |
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| Custom Audio Playback |
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N/A |
Purchase Smartbuds & Choose a Subscription.
Save by subscribing for multiple months.
Receive your Smartbuds in the mail and start using them.
The NextSense App will let you know when it’s time to replace your tips and wings
(average 30 days)
Periodically receive new wings and tips in the mail to keep your signal strong.
Electroencephalography (EEG):
2, 24-bit channels sampled at 1000 Hz
Soft Flexible Sensors:
6 clinical-grade dry-contact surface electrodes with Tecticoat
Sensing Locations:
Ear Canal, Concha Cavum, and Antitragus
Body Motion:
6-axis inertial movement measurement from accelerometer & gyroscope
Slow Wave Stimulation:
EEG-guided auditory stimulation
Audio Playback:
48kHz / 16-bit
Audio Driver:
6 mm Dynamic Driver, frequency range: 20 Hz – 20 kHz
Battery Life (Smartbuds):
Up to 9 hours of streaming and stimulation / on-devide audio
Battery Life (Charging Case):
Up to 4 additional charges
Charging Port:
USB-C
Battery Capacity:
Each earbud: 35 mAh / 0.13 Wh Charging case: 400 mAh / 1.48 Wh
Bluetooth Version:
Bluetooth 5.3
BR/EDR, LE, Dual-mode, LE Audio
Companion App:
iOS17 or later
Data Syncing:
Continuous, event-driven sync
Ear Tip & Wing Sizes:
3 sizes (S, M, L)
Ear Tip & Wing Material:
Conductive silicone with Tecticoat® coating
Weight per Smartbud:
~5g
Smartbuds
Charging Case
Getting Started Guide
400mm USB-C to USB-C cable
Eartips (S, M, and L)
Wings (S, M, and L)
Submit a question or concern through this form
Contact our customer support line: 888-898-8068.
EEG (electroencephalography) measures electrical activity in the brain. It's the gold standard for sleep science, allowing Smartbuds to detect sleep stages and optimize audio in real time—unlike wrist trackers that only infer sleep from movement or heart rate.
No. EEG detects patterns like sleep depth or transitions—not thoughts, memories, or emotions. Your mental privacy is deeply respected.
Yes. We never sell or share your data. Data sharing is off by default, and all information is encrypted, stored securely, and anonymized before leaving your device. You can delete your data anytime from within the app.
Slow-wave sleep, also called deep sleep, is the most restorative stage of sleep. It's when your brain produces slow, high-amplitude delta waves. This stage is essential for waking up refreshed.
It can—if it's the wrong kind. Jarring, unpredictable, or overly stimulating audio can disrupt your rest. That's why Smartbuds use gentle soundscapes specifically designed to support healthy sleep. When personalized and timed right, sound can actually enhance your sleep rather than interrupt it.
Slow-wave enhancement is a technique that uses precisely timed sound (soft pink noise) to nudge your brain waves into their most restorative rhythm. This the enhances the quality of your sleep without waking you up.
Use a cloth dampened with bottled water to gently clean the surface. Let everything dry completely before using again. Clean weekly for best performance.
Smartbuds' wings and tips require regular replacement to continue collecting brain data. Always handle them gently and even if you're only swapping out wings, you’ll need to take the tip off first.
Step 1: Remove the tip. Hold the earbud firmly in one hand. With the other hand, pinch the silicone tip near its base and pull it straight off using a slow, steady motion. Don’t twist or yank—these components are delicate and house important sensors.
Step 2: Remove the wing. Gently peel the wing away from the body of the earbud, starting at one edge and working around. It should come off with light, even pressure—no need to force it.
Step 3: Attach the new wing. Align the new wing so that the cutout fits neatly around the base of the earbud. Stretch the wing gently into place and press it down so it sits flush and snug against the earbud.
Step 4: Attach the new tip. Align the new tip with the nozzle of the earbud. Press it on firmly until it feels secure—you may hear or feel a soft click when it’s in place.
No. Avoid rain, heavy sweat, and any moisture exposure. Do not submerge them in water or wear them in the shower.
Your sleep routine is the window when you aim to be asleep—from your usual bedtime to your usual wake-up time. Setting it helps us customize your experience, like reminding you to charge your Smartbuds before bed. It doesn’t set an alarm or prevent you from starting a sleep session at a different time. Many users also find it helpful for setting sleep goals and keeping a consistent sleep schedule.
Yes, Smartbuds are designed to be used with a subscription. The monthly Fit Kit (tips and wings) ensures lasting comfort and maintains the accuracy of the EEG sensors over time. As tips and wings naturally wear down, fresh replacements keep your Smartbuds performing at their best. The subscription is what makes Smartbuds a long-term solution, giving you consistent results and peace of mind.
Submit a question or concern through this form
Contact our customer support line: 888-898-8068.
