The FLOWBIO Sensor is the world’s most accurate sweat sensor, independently validated to deliver lab precision.
Built to analyse your sweat in real time, it measures how much fluid and sodium you’re losing — and syncs with the FLOWBIO App to turn that data into clear, personalised hydration strategies. So you know what to drink, when, and how much.
Get preparation tips before each session and recovery advice afterwards to keep your performance consistent. The Hydration Planner creates strategies tailored to each workout, and adapts to intensity, duration and conditions. The result: recommendations for exactly how much fluid and sodium you need before and and during each session.
The sensor can be worn on your upper arm with the included FLOWBIO strap, or paired with your HR chest strap. With a 100-hour battery life, USB-C charging, and seamless integration with Garmin, Zwift, Wahoo, and Coros, it fits into the way you already train. Unlike other platforms, FLOWBIO is a one-time purchase — no subscriptions, just lasting performance insights.
Original price was: $595.00.$495.00Current price is: $495.00. AUD inc GST
In stock
I’ve just started using the device, and my goal is to build a full table of my sweat data across training zones and climates. Even after just a few sessions, I surprised to see the differences — I always thought sweat rate was more linear, but FLOWBIO showed me how much intensity and climate change the picture.
Léa Riccoboni
Pro Triathlete
“Having FLOWBIO predict my race day hydration strategy has been game changing. No longer am I guessing on how much to drink and it’s shown just how important electrolytes are when racing.
At National Champs it finally felt like I was going into a road race with a plan for my hydration strategy which allowed me to focus on racing”.
Xan Crees
British CX Champion
“Winning my age group at Ironman Cairns 2025. It was the first time I completed a full Ironman without cramping or fading — I stayed steady and in control from start to finish. FLOWBIO helped me understand my real hydration and sodium needs and adjust my hydration accordingly. I stayed consistent, clear-headed, and was able to finish strong.”
Laurent Travers
Amateur Ironman Age-group Winner
FLOWBIO makes sweat measurable. In just a few simple steps, the sensor captures your sweat data and turns it into personalised insights you can act on before, during, and after every session.
Whether you’re clocking up miles on the bike or pushing the pace on a run, the FLOWBIO Sensor gives you personalised, science-backed hydration data to help you perform better and recover faster.
FLOWBIO measures your sweat rate (L/hr), sodium concentration (mg/L), and skin temperature as you train. That data is synced to the FLOWBIO App, where advanced algorithms turn it into hydration recommendations specific to your physiology and environment.
It’s more than sweat tracking — it’s hydration guidance. Get preparation tips before each session and recovery advice afterwards to keep your performance consistent.
The Hydration Planner creates session-specific strategies, factoring in intensity, temperature, and your own sweat profile. The result: clear recommendations for exactly how much fluid and sodium you need before, during, and after training.
The sensor can be worn on your upper arm with the included FLOWBIO strap, or paired with your HR chest strap. With a 100-hour battery life and USB-C charging, it’s built to keep up with your training.
The app connects with Garmin, Zwift, Wahoo, and Coros, and works with your preferred electrolyte brand, so it fits into the way you already train.
What sets FLOWBIO apart is its independent validation: lab precision of up to 90% and in-field accuracy as high as 83% for sodium loss. No other system delivers this level of accuracy in real training conditions.
And unlike other platforms, FLOWBIO is a one-time purchase — no subscriptions, just lasting performance insights.
FLOWBIO Sensor:
FLOWBIO App:
The Sensor captures your sweat and analysis its contents. Proprietary algorithms use the sensor data to estimate your sweat rate and sodium loss. The data is shown on the FLOWBIO App, offering recovery and preparation suggestions and tips to optimise your performance.
Currently, data from the Sensor is accessible only during cycling, running or walking activities. We plan to expand and include other sports as we grow.
The Sensor is designed to be worn on an existing heart rate monitor. We support both optical arm-based monitors and chest straps, offering flexibility in wearing the Sensor either on the upper arm or on your back.
The Sensor measures your sweat rate and sodium loss, helping you optimise your recovery and prepare for training and events by ensuring you replace and bring the necessary fluid and electrolytes.
Our latest data has indicated that we are 90% accurate in lab based conditions. In the field we achieve accuracies up to 83% for our sodium with as little as 23 mg difference (that is 6x less than a pinch of salt). Our fluid loss is 73% accurate with as little as 250mL difference to in-field gold standards.
You can exercise without your phone nearby, but for syncing the Sensor and viewing your data, having your mobile device is essential.
At present, using the FLOWBIO System requires a fitness tracker integrated with the Companion App. We currently support the following integrations:
