MX3 Diagnostics vs Nix Solo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MX3 Diagnostics
Measure and track hydration and sweat sodium levels quickly and conveniently. This system allows athletes, coaches, and managers to manage hydration data for individuals or teams anytime, anywhere. Personalize assessments and manage athlete accounts.
- Perform hydration measurements
- Perform sweat sodium measurements
- View and edit historical data
- Personalize hydration assessment
- Create team/athlete accounts
- Update device firmware
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Say goodbye to time-consuming and inconvenient testing with the MX3 Hydration Testing System. With the MX3 Hydration Testing System athletes, coaches, and team managers can finally measure, track, and manage hydration - anytime, anywhere. With the MX3 Diagnostics app you can: - Perform Hydration Measurements - Perform Sweat Sodium Measurements - View and edit historical measurement data - Personalize hydration assessment with baseline measurements - Create accounts for your team, organization or athletes - Update MX3 LAB firmware
Nix Solo
Monitor personal fluid and electrolyte losses in real-time during workouts. This app provides insights into sweat composition and hydration needs based on individual biology, using data from a companion biosensor.
- Real-time fluid and electrolyte loss monitoring
- Personalized sweat composition insights
- Correlates sweat data with environmental factors (Nix Index)
- Post-workout Sweat Intelligence reports
- Integration with Apple Watch and Garmin devices
- Workout type and hydration input
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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.
Screenshots
Verdict
The clearest difference is ratings volume: Nix Solo at 60 against MX3 Diagnostics's 2. Nix Solo also leads on update cadence (every 10 days vs monthly). MX3 Diagnostics's advantage is rating (5.0 vs 4.8) and iOS requirement (10.0 vs 15.1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
MX3 Diagnostics holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Nix Solo has 60 ratings behind it against 2, so its average is the more settled of the two.
MX3 Diagnostics ships an update monthly, Nix Solo every 10 days. The most recent releases landed on August 20, 2026 and September 21, 2026 respectively.
| Parameter | MX3 Diagnostics | Nix Solo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.8 (60 ratings) |
| Positive reviews | — | 14.3% of reviews |
| Number of ratings | 2 | 60 — better |
| Update frequency | Monthly | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 10.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 124 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | MX3 DIAGNOSTICS | Nix, Inc. |
Customer experience
MX3 Diagnostics
Nix Solo
In-app purchases
MX3 Diagnostics
No in-app purchases
Nix Solo
No in-app purchases









