Each health wearable in the marketplace tracks the identical handful of metrics. Coronary heart fee, step depend, blood oxygen, sleep levels. The checklist hasn’t modified in 5 years, and most of it measures what’s occurring inside your physique whereas fully ignoring what’s leaving it. Your sweat carries knowledge that no wristband or ring has discovered the way to seize. Sweat evaluation patches from firms like Nix and Gatorade have taken a run on the drawback, however the class nonetheless hasn’t hit mainstream the way in which coronary heart fee screens did a decade in the past. That hole has quietly formed how hundreds of thousands of athletes hydrate: by guessing.
So the true query isn’t whether or not you’re consuming sufficient water. It’s whether or not you’re changing the particular electrolytes your physique dumped throughout that final session, in the precise ratios, on the proper time. A runner in Miami warmth and a bike owner in dry mountain air lose fully completely different quantities of sodium per liter of sweat. That distinction determines whether or not you cramp at mile 18 or end sturdy. Smartwatches can’t inform you any of that as a result of they don’t have the sensors for it. The complete wearable business constructed its hydration recommendation round generic “drink extra water” reminders that deal with each physique the identical, which is roughly as helpful as a thermometer that solely reads “heat.”
Sweanty, a Spanish startup that’s been constructing sweat evaluation patches since 2021, confirmed up at MWC 2026 with a repair that feels overdue. The know-how was developed throughout co-CEO Laura Ortega Tañá’s PhD analysis, and in line with the corporate, the patented sensor has since been validated with high-performance athletes and industrial employees in excessive warmth. The corporate demoed its SweaTracker in Barcelona, and the pitch turned heads for what it didn’t require: no charging cable, no Bluetooth pairing, no wrist actual property.
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What it’s
The SweaTracker is a disposable sensor patch that sticks to the bottom of your again and measures how a lot salt you’re shedding by sweat throughout train. Bought in packs of three, which is the minimal Sweanty must construct your preliminary “SWEATPROFILE,” a baseline studying of your physique’s distinctive electrolyte output. Every patch is single-use. You peel it on earlier than coaching and toss it when the session ends.
The shape issue seems nearer to a medical adhesive strip than something you’d affiliate with a health tracker. Versatile electronics sit inside a skinny layer of medical-grade supplies designed to deal with excessive sweat charges with out degrading mid-run. Should you’ve ever worn a steady glucose monitor, the bodily expertise is acquainted: light-weight, stays put whilst you transfer, skinny sufficient that clothes doesn’t catch on it.
The patch talks to your telephone by NFC relatively than Bluetooth, which suggests you faucet it towards your gadget after the exercise as an alternative of preserving your telephone close by in the course of the session. That’s a genuinely good selection for path runners who depart telephones behind on lengthy efforts. No mid-workout syncing retains the patch lighter and less complicated.
Sweanty locations the patch on the decrease again, a selection the corporate hasn’t publicly defined however that tracks with analysis displaying sweat composition varies throughout physique zones. A brow patch would provide you with completely different numbers than a chest patch on the identical run. You discover the deliberate positioning when you contemplate how placement impacts knowledge high quality.
How the paper battery modifications the sport
The core know-how is a patented paper-based battery with two electrodes embedded inside. When the paper is dry, the battery stays dormant. The second sweat absorbs into it, the gadget wakes up and generates a present that correlates on to salt focus within the perspiration. That technique eliminates the necessity for a lithium-ion cell, a charging port, or any of the ability administration complexity that inflates the price and dimension of standard wearables. There’s a sublime effectivity to a sensor that pulls energy from the identical substance it’s designed to research.
NFC handles knowledge switch after the session. You maintain your telephone towards the used patch, and the amassed sweat knowledge strikes over in a single contactless faucet. No pairing course of, no background app drain throughout your run.
Sweanty generates a SWEATPROFILE from the primary three patches in a Welcome Pack. Every session contributes sweat fee, salt focus, and estimated fluid loss knowledge, which the app combines together with your weight, age, top, and sport. The corporate recommends refreshing your profile each three months with a two-patch refill pack, since environmental modifications and health shifts have an effect on composition over time. That cycle retains hydration plans calibrated to your present physiology relatively than stale knowledge from a special season.
As of early 2024, the group was additionally creating a model the place the electronics may very well be retained after every use, with solely the disposable sweat-collection layer being changed. If that effort remains to be energetic and Sweanty cracks the engineering problem whereas preserving accuracy intact, the enterprise mannequin shifts from consumable patches to a reusable platform with replaceable inserts. That iteration may very well be the inflection level between a distinct segment pro-athlete instrument and one thing each weekend runner considers.
The companion app builds your hydration playbook
The Sweanty app interprets uncooked sweat knowledge into particular hydration plans: what merchandise to eat, how a lot, and when throughout your occasion. For a marathon, it lays out pre-race vitamin, mid-race electrolyte timing, and restoration merchandise, all personalised to your profile. You discover the specificity instantly if you evaluate it to the imprecise “keep hydrated” prompts on most smartwatch apps.
Premium subscribers can generate limitless plans for his or her major sport. Each specifies salt content material and carbohydrates per hour for really useful merchandise, although Sweanty doesn’t promote or bundle the merchandise themselves. That’s a welcome selection as a result of it retains suggestions trustworthy: the system isn’t incentivized to push branded dietary supplements. In case your most popular electrolyte model doesn’t match your profile, the app suggests options primarily based on composition relatively than sponsorship. For a startup that was nonetheless listed as pre-seed at MWC, the software program depth suggests the group spent as a lot time on the app as on the patch {hardware}.
Who ought to skip this
Swimmers and water sport athletes can cease right here. The SweaTracker can’t perform when submerged, and that’s a physics limitation of the paper battery, not a design oversight.
Should you prepare casually and by no means compete, the price math will get more durable to justify. Three patches to construct your preliminary profile plus refill packs each three months provides up, and the profit tilts towards athletes who push onerous sufficient that electrolyte depletion really impacts efficiency.
The SweaTracker is already out there for buy, with 2024 estimates placing the Welcome Pack at roughly €120 for 3 patches plus three months of app entry. Every patch is single-use and the three-month knowledge window means recurring purchases are baked into the mannequin. Weekend joggers who keep underneath 45 minutes in delicate climate in all probability gained’t discover the distinction between a Sweanty plan and simply carrying a water bottle.
Who that is for
Path runners, highway cyclists, triathletes, outside building crews, firefighters working in excessive warmth, and anybody who’s cramped throughout a race as a result of the incorrect electrolytes obtained changed on the incorrect time. Should you’ve ever finished knowledgeable sweat take a look at at a lab, you already perceive the worth of figuring out your salt loss fee, and a single lab go to prices excess of a pack of those patches whereas supplying you with knowledge from just one managed session.
The SweaTracker turns that medical measurement right into a field-portable, self-administered instrument that works wherever you prepare. Coaches constructing individualized hydration protocols throughout a full roster might discover this particularly sensible. The commercial security angle provides one other layer: employers with crews in excessive warmth might use the information to cut back warmth stress incidents as an alternative of counting on generic break schedules.
Your smartwatch tells you how briskly your coronary heart was beating and what number of energy you burned. Sweanty tells you what your physique really misplaced and precisely the way to put it again. That’s a class of wearable knowledge that hasn’t existed at shopper costs till now, and it took a PhD, a paper battery, and a startup sales space at MWC to get it there.
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