Comparison

MX3 Diagnostics vs Nix Solo

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Perform hydration measurements
  • Perform sweat sodium measurements
  • View and edit historical data
  • Personalize hydration assessment
  • Create team/athlete accounts
  • Update device firmware
Features
Read full description

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

About

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.

Highlights
  • 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
Features
Read full description

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

MX3 Diagnostics4 screens
Nix Solo4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
MX3 Diagnostics versus Nix Solo: the parameters behind the verdict, then further details
ParameterMX3 DiagnosticsNix Solo
PriceFreeFree
Rating5.0 (2 ratings) — better4.8 (60 ratings)
Positive reviews—14.3% of reviews
Number of ratings260 — better
Update frequencyMonthlyEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS10.0 — better15.1
Further details — not scored
Size124 MB65 MB
Age rating4+4+
DeveloperMX3 DIAGNOSTICSNix, Inc.

Customer experience

MX3 Diagnostics

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Nix Solo

All ratings60 ratings
Positive93.3%
Neutral3.3%
Negative3.3%
Written reviews21 reviews
Positive14.3%
Neutral14.3%
Negative71.4%

In-app purchases

None

MX3 Diagnostics

No in-app purchases

None

Nix Solo

No in-app purchases

Questions

Is MX3 Diagnostics free?
MX3 Diagnostics is free to download, with no in-app purchases.
Is Nix Solo free?
Nix Solo is free to download, with no in-app purchases.
Which has better reviews, MX3 Diagnostics or Nix Solo?
MX3 Diagnostics is rated higher. MX3 Diagnostics averages 5.0 out of 5 from 2 ratings, while Nix Solo averages 4.8 from 60 ratings.
Do MX3 Diagnostics or Nix Solo have ads?
Neither MX3 Diagnostics nor Nix Solo shows ads.
Which is updated more often, MX3 Diagnostics or Nix Solo?
MX3 Diagnostics ships an update monthly, and Nix Solo every 10 days. Most recently, MX3 Diagnostics was updated on August 20, 2026 and Nix Solo on September 21, 2026.

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