Master Your Ultra Race
The ultimate app for race strategy, nutrition tracking, crew coordination, and goal management. Don't leave your performance to chance.
Everything you need to cross the finish line.
1. Smart Race Pacing, Weather Engine & Crew Sync
Course & Race Catalog
- Goal Categorization: Set targets for Races, FKTs (Fastest Known Times), or Training runs.
- GPX Elevation Parser: Upload .gpx files to parse distances, elevation gain/loss, and automatic segmenting.
- Community Catalog: Access pre-loaded system races or submit your own custom course plans to the global community library.
- Multi-Unit Support: Seamless metric (km, m, °C) and imperial (mi, ft, °F) conversion.
Dynamic Pacing & Weather Strategy
- Flexible Views: Switch effortlessly between Aid Station Segment view and Hourly pacing view.
- Effort Pacing Slider: Instantly recalculate segment split times using our elevation effort model.
- Weather-Adaptive Engine: Real-time temperature and humidity inputs scale hourly fluid & sodium targets automatically.
- Aid Station & Cutoff Rules: Customize aid station distances, cutoff times, and resource availability.
Crew Sync & Handoffs
- Crew Sync: Generate a unique invitation code for crew members to access the information you prepared in a dedicated Crew Mode of the app.
- Interactive Drop Bags & Checklists: Itemized packing lists and station-specific drop bag manifests.
- Crew Viewpoints & GPS: Dedicated meeting points with exact physical addresses and GPS navigation coordinates.
- Offline PDF Reports: Export clean, printable PDF race books for offline crew access without cell service.
2. Scientific Fuel Engine, Pantry & Simulator
Pantry & Macro Profiling
- Complete Pantry Database: Organize Gels, Drink Mixes, Solids, Electrolytes, and Capsules.
- Full Micronutrient Breakdown: Track Energy (kcal), Carbs (g), Sodium (mg), Caffeine (mg), Calcium, Magnesium, and Potassium.
- Electrolyte Spectrum: Balance multi-mineral ratios to prevent late-race muscle cramping.
Endurance Science Engine
- Gut Fatigue Decay Model: Automatically models GI absorption decay after 15 hours of racing (2%/hr taper) for realistic carb targets.
- Targeted Caffeine Strategy: Calculates optimal caffeine boost intervals in the final 30% of long efforts.
- Deficit Tracking: Real-time alerts for hourly carbohydrate, fluid, and sodium deficits.
Hourly Simulator & GI Safety
- Sandbox Environment: Test custom hourly fuel combinations against scientific intake baselines.
- Osmolality & GI Safety Alerts: High concentration warning triggers if fuel density exceeds fluid volume, preventing stomach shutdown.
- Live Alignment Dashboard: Instant visual breakdown of target vs. actual carried nutrition.
3. Personalized Sweat Profile & Local-First Privacy
Physiological Profile Data
- Baseline Metrics: Input Sex, Weight, and Height to establish physiological energy expenditure baselines.
- Scientific Target Math: Science-based hourly carb, fluid, sodium, and calorie requirements calculated automatically.
- Lab-Tested Data Overrides: Overwrite default baselines with your own sweat test or metabolic lab results.
Sweat & Gut Adaptation
- Sweat Rate & Salt Loss: Select personal sweat categories (Light to Very Heavy) and salt loss concentration (Low, Med, High).
- Gut Training Level: Select carb absorption capabilities (Beginner 45g/h, Intermediate 65g/h, Advanced 85g/h+).
- Local-First Privacy Architecture: 100% local device storage for runner profile and custom strategies with zero cloud lock-in.
Frequently Asked Questions
Unlike standard GPS trackers, Ultra-Go focuses specifically on the complex science and logistics of ultramarathon racing: elevation-adjusted segment pacing, weather-adaptive hydration and sodium targets, gut fatigue decay modeling, osmolality safety warnings, and live crew coordination.
Ultra-Go incorporates your race day temperature (°C / °F) and humidity (%) into its hydration engine. Hotter or more humid conditions dynamically scale up your hourly fluid and sodium intake targets to protect against dehydration and cramping.
The app calculates the osmolality and concentration of your fuel mixtures (gels, drink mixes, and water). If your hourly carb intake is too dense for the fluid volume carried, Ultra-Go triggers hypertonic concentration alerts to ensure proper absorption and prevent stomach distress.
Ultra-Go generates a unique Crew Invitation Code for your race. Your crew members enter this code on their own mobile devices in Crew Mode to access aid station drop bag lists, handoff instructions, and viewpoint GPS directions.
Yes! All your physiological profile data, custom pantry inventory, and race strategies are stored locally on your mobile device. We may also use cloud based servers to store your data when you have a subscription so that information can be shared with your crew and you can access your information on multiple devices.
No. Because your race strategy and data are stored locally on your device, you can access your pacing timelines, aid station details, and nutrition plans even in remote mountain areas without cell service.
Yes! In addition to pre-loaded system races, Ultra Pro members can upload GPX files or configure custom aid stations and submit them to the global Ultra-Go community race catalog.
Yes, you can seamlessly toggle between metric (kilometers, Celsius, milliliters) and imperial (miles, Fahrenheit, fluid ounces) units in your Runner Profile.
Ready to master your next ultra?
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