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Future Apple Watch could gain sweat-sampling hydration tracker
August 01, 2025
Hydration tracking is a standard feature on several smartwatches allowing users to keep track of their fluid intake. But a new patent by Apple suggests that theApple Watchmay soon monitor a wearer’s hydration levels automatically.
Spotted byPatently Apple(h/tGizmoChina), thepatentdetails a non-invasive hydration tracking sensor that’ll monitor the electrolytes in a wearer’s perspiration using electrodes. The watch can calculate the user’s hydration level based on the concentration of these electrolytes in the wearer’s sweat. Apple is considering placing “one or more electrodes” on the Apple Watch’s band.
Apple Watch hydration tracking: The Pros
Hydration tracking would be a handy tool for athletes at risk of dehydration during marathons or hikes. Should hydration levels deteriorate, it’s likely that the wearable will then be able to advise its owner to drink well before dehydration sets in. While there are plenty ofwater reminder appsavailable, they rely on a pre-determined period to issue reminders, not real-time data. When used alongside the Apple Watch’s other metrics, hydration data could help wearers understand their current and long-term health.
Apple’s last significant sensor addition to its wearable line brought anECGto the Series 4. Since then, the likes ofSamsungandFitbithave also introduced body composition sensors and EDA sensors to their respective devices.
Based on the filing date, Apple has been working on this patent for at least three years, but it’s unlikely the sensor would be ready for use on the Apple Watch Series 7. Don’t rule out its introduction on a future model, though.
What do you think of smartwatch-based hydration tracking? Let us know in the comments below.
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