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Nix Biosensors has raised $10 million in Series A funding to expand its sweat-sensing platform and build Nix Health, a hydration algorithm designed to work with third-party consumer health and fitness products.
The round brings the company’s disclosed funding to $17 million and includes investors such as Shorewind Capital, Great Oaks Venture Capital and 23andMe co-founder Anne Wojcicki.
From sweat sensor to software layer
Nix’s current $189 Hydration Biosensor uses a disposable patch and reusable pod worn on the bicep. During exercise, the system measures local sweat flow and electrolyte concentration. It then uses those signals to estimate whole-body fluid and electrolyte losses, providing users with personalised hydration guidance.
A new strategy looks to bring that model to more consumers. Nix Health is being developed as a licensable software layer that can estimate sweating onset, sweat rate and electrolyte loss from user, activity and environmental data, without requiring a Nix sensor.
Nix says years of sweat measurements collected through its hardware will underpin those predictions, with a broad launch targeted for Q1 2027.
Moving from measurement to prediction
The current hydration sensor directly samples sweat from the bicep, but it still uses modelling to estimate total fluid and electrolyte loss across the body. Sweat rate and sodium concentration differ between people, conditions and parts of the body, so a measurement from one small area cannot simply be treated as a whole-body measurement.
Nix says its current sensor estimated whole-body fluid loss with an average error of 17.2% compared with body-mass measurements during exercise. That figures come from Nix’s own validation work, while independent real-world testing has found larger errors, particularly at higher sweat rates.
Nix now wants to use funding to bring its expertise and modelling to a wider audience. A hydration algorithm embedded inside an existing watch, training app, or health platform removes the need for another wearable product and disposable patches.
