SweatSmart Electrolytes

Best app for sweating on those long runs

Science-Backed Electrolyte Planning for Runners

SweatSmart helps runners optimize electrolyte intake with evidence-based estimates tailored to your profile and workout conditions. Whether you're training for a marathon, ultramarathon, or just staying healthy, get personalized sodium recommendations based on peer-reviewed sports science.

KEY FEATURES

Personalized Electrolyte Calculator – Customized sodium targets based on your weight, fitness level, heat acclimatization, and workout intensity Weather Integration – Auto-populate temperature and humidity from your current location DIY Sweat Test – Measure your personal sweat rate and sodium needs for maximum accuracy Product Recommendations – Find the perfect sports drinks, gels, and supplements to match your targets Session History – Track estimates over time and monitor trends Multi-Platform – Seamless experience across iPhone, iPad, and Mac with iCloud sync

EVIDENCE-BASED SCIENCE

All calculations based on research from the American College of Sports Medicine (ACSM), National Athletic Trainers' Association (NATA), German Nutrition Society (DGE), and peer-reviewed studies on sweat rate and electrolyte loss.

SMART CALCULATIONS

SweatSmart considers body mass, biological sex, fitness and heat acclimatization status, exercise intensity and duration, temperature, humidity, sun exposure, dietary sodium intake, and personal sweat test results.

TAILORED RECOMMENDATIONS

Get specific hourly sodium targets from 200–1200+ mg/hour, including total session electrolyte loss estimates, estimated sweat rate, fluid intake guidelines, safety warnings for extreme conditions, and product dosage recommendations.

HYDRATION DATABASE

Browse and compare 80+ sports nutrition products including sports drinks, energy gels and chews, electrolyte tablets and powders, and salt capsules — sorted by best match to your needs.

DESIGNED FOR RUNNERS

Clean, modern interface optimized for each platform. Quick calculations in seconds with visual feedback on sodium needs, confidence ratings, and dark mode support.

PRIVACY FIRST

All data stored locally on your device. No account required. No ads or tracking. Works completely offline (except weather features).

PERFECT FOR

Marathon and ultramarathon runners, triathletes, trail runners, anyone training in hot climates, runners dealing with cramping, athletes fine-tuning race nutrition, and sports nutritionists and coaches.

DISCLAIMER

SweatSmart provides estimates based on population research. Individual sweat rates and electrolyte losses vary significantly. This app does not replace personalized medical advice. Always listen to your body and adjust based on your experience.