Nix Solo 4+

App crashed via Bluetooth connectivity during a 98°F ultra marathon yesterday so I couldn’t add fluid replenishment throughout the day; and it wouldn’t save my workout or reconnect to the Nix pod until I restarted my phone. I was at least able to retrieve sweat loss data after my run, but it added five hours of runtime (15.5 hours instead of what should’ve been 10.5, because the app wouldn’t let me save the workout until hours after). I would love to be able to edit the workout time, but that’s not an option. Also, regarding editing, I’ve tried to edit fluid replenishment and workout name, but it never saves the new edited data. Sharable graphics still isn’t working as well. Please work out these bugs because this is such a great tool when it’s working properly! Love being able to track my sweat loss; it really makes a difference in recovery after ultra marathons.

This app is not very good as it crashes all the time during workouts. It also doesn’t notify you very well even when it is running. So I have stopped relying on it to cue me when to drink water. Instead I’ve used the overall electrolyte and fluid loss data to learn how to better hydrate during my workout. Even if the the app crashes during a workout, just restart the app and it will still download the data from the sensor. So you can collect workouts over time to learn how much you expell in various conditions. Just don’t expect it to notify you properly during a workout. Still very insightful data.

Have been using the Nix system for a couple of months now. When it works, it is spot on with the information. Due to previous issues, I now place the pod on the patch and start the app all the way to starting a workout to make sure everything is going to work; saves on patches. Newer software releases have addressed some problems. Customer support has been very good with reasonable turnaround times via email.

The app REALLY uses phone battery fast! They are working on it so I expect that it will improve over time. You must be in cell coverage for it to provide real-time info. It may or may not reconnect when coverage comes back. Connectivity to a Garmin device is spotty and they advertise the problem is being addressed.

For shorter rides/event ~4 hrs it’s a pretty good tool and improvements keep coming. For longer events battery and cellular coverage can render the real-time data useless. However, using your past history and the Nix values from previous data it provides you enough information to calculate your fluid and electrolyte requirements.

Needs some improvements, but much more valuable than a single sweat test whose data is based on a single environmental data set. Recommend it as a tool that should improve over time.