NextSense thinks you’re done with sleep apps that only grade your night after the fact. It launched Smartbuds, EEG sleep earbuds built around a different promise, the buds don’t just measure sleep, it claims they can improve it while you’re still asleep.
The pitch hinges on brain sensing. NextSense says Smartbuds use six EEG sensors to pick up brain activity, detect sleep stages and transitions in milliseconds, then trigger targeted audio stimulation aimed at supporting deeper sleep. That’s a sharper claim than most consumer wearables, which typically infer sleep from motion or heart rate.
NextSense also frames the system as something that learns you over time, adjusting night by night.
A tracker that pushes back
The headline feature is a closed-loop approach. NextSense describes the earbuds as continuously monitoring EEG signals, then responding with stimulation when the timing lines up, rather than waiting until morning to hand you a score.
It also wants EEG to feel effortless. Smartbuds are positioned as true wireless earbuds instead of a headband or wired setup, with the goal of making brain sensing something you’ll actually wear nightly.
The price and the catch
Smartbuds are priced at $399.99 at retail, with an early bird offer of $249. After the first three months, NextSense lists a Fit Kit subscription starting at $14.99 per month to keep using the system, so the long-term cost is part hardware, part service.
Phone support is limited for now. You need an iPhone 12 or newer running iOS 17 or later, which shuts out Android users and older iPhones unless compatibility expands. That reality makes the decision pretty simple, you’re buying into an ecosystem, not just a gadget.
Proof points to watch
To back up the promise, NextSense points to a controlled beta spanning 106 nights, reporting an average increase in slow-wave activity with Smartbuds. It also cites user-reported improvements in sleep quality, mood, energy, and focus, plus more than 1,400 nights of real-world data.
If you’re tempted, the practical move is to treat Smartbuds as a new class of EEG sleep earbuds and weigh the early bird price against the subscription. Watch for broader device support and outside validation, that’s when this shifts from bold claim to reliable sleep tool.