Nix Solo

Nix Solo icon

Nix Solo

Nix, Inc.

AppRecs review analysis

AppRecs rating 3.5. Trustworthiness 79 out of 100. Review manipulation risk 22 out of 100. Based on a review sample analyzed.

★★★☆☆

3.5

AppRecs Rating

Ratings breakdown

5 star

56%

4 star

0%

3 star

22%

2 star

0%

1 star

22%

What to know

Low review manipulation risk

22% review manipulation risk

Credible reviews

79% trustworthiness score from analyzed reviews

About Nix Solo

To train at your peak, you can’t just train hard. You need to train in a way that’s informed by your personal biology.

The Nix Solo app allows users to monitor their own personal fluid and electrolyte losses in real time during a workout using the Nix Hydration Biosensor. This companion app provides valuable insight into their unique sweat composition and individual hydration needs based on their personal biology.

At Nix, we built the first biosensor to analyze sweat and provide endurance athletes with personal hydration data – scientifically validated, and delivered in real time.

Once paired with the Nix Hydration Biosensor, you are on your way to understanding your hydration needs with Nix Solo, our individual monitoring app. We’re the first hydration biosensor of its kind — the only pod, patch, and free app combination to:

- Evaluate the electrochemical biomarkers in your sweat
- Send real-time updates to your phone, Apple Watch, Garmin Watch, or Garmin Bike Computer
- Correlate your sweat data and your training environment with the Nix Index – a composite index of six environmental factors: temperature, humidity, dew point, altitude, wind speed, and solar load
- Provide post workout Sweat Intelligence via insights on your Sweat Profile including fluid loss rate, electrolyte loss rate and sweat composition metrics

Before your workout, tell the Nix Solo app what type of workout you’re doing and what you’ll be hydrating with. You can also consult the Nix Index to see how your environment impacts your hydration needs.

Once you start sweating, our single-use patch begins measuring and analyzing your fluid and electrolyte losses minute by minute- metrics that represent your unique “sweat composition.” This data is instantly streamed to our app, and can also be shared with devices like your Apple Watch, Garmin Watch, and Garmin bike computer.

The result is knowing when, what, and how much to drink in real time to enhance both safety and performance.
Nix Solo Screenshots
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Reviews for Nix Solo

AustinTXH

No bugs as of 7/10/25, massively insightful data

I’ve been using nix for the past 6 weeks and am blown away by the insights. I haven’t had any app crashes or bugs that I’ve seen on the other reviews. I have used whoop, garmin, levels, 8sleep, aura etc and this interface and usability is on par, or much better in some cases (garmin connect). I’m not currently training for a race, but this tool has almost given me a reason to sign up for another. Living on the lake outside of Houston, the Nix index is 100 on most of my workouts and I sweat considerably more than I would have ever imagined. Like 54oz doing yard work is nuts. Also, the breakdowns of how much of each electrolyte is very insightful and helpful in determining which drink and how much to consume before, during and after. I love this product and really glad it exists. I’m surprised it’s not a bigger deal than it is already.

Huffin&Puffin55

Unresponsive

The app was working fine. Now that it asked for update it won’t recognize my password or email. I have tried resetting my password and app to no avail.

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