Running nutrition : Trailfuel
Train your gut like your legs
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Train your gut like you train your legs — per-run carb needs that get smarter every time you log a run.
TrailFuel turns race-day fueling from a guess into a plan you've trained for.
Endurance athletes don't bonk because they picked the wrong gel — they bonk because their gut was never trained to absorb carbs at race intensity. TrailFuel fixes that.
CALCULATE YOUR CARB NEEDS
Enter any run — import a GPX file or set distance and elevation — and TrailFuel calculates exactly how many grams of carbohydrate per hour you need, plus your total for the run. Course intensity, duration, and your own tolerance all factor in.
TRAIN YOUR GUT, PROGRESSIVELY
Log what you actually ate and how your stomach felt after each run. TrailFuel builds a personal GI-tolerance profile and nudges your carb target up one safe step at a time — so race day is never the first time your gut sees 80g/hr.
BUILT TO PREVENT GI DISTRESS
GI distress is the #1 sourced cause of ultra DNFs. TrailFuel is designed around your stomach, not just a generic carbs-per-hour number.
WHO IT'S FOR
Trail runners, marathoners, ultra-runners, cyclists, and triathletes who train for months and refuse to let fueling be the weak link.
SUBSCRIPTION
TrailFuel is a subscription with a 1-week free trial on the yearly plan. Monthly and yearly options available. Cancel anytime in your App Store settings.
Terms of Use: https://1rie.ink/app/terms
Privacy Policy: https://1rie.ink/app/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes and performance improvements.
Thanks for using the app!
The developer, Gregoire Cambon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Financial Info
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Teech Golf
- Size
- 30.1 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- TrailFuel Yearly $49.99
- TrailFuel Monthly $14.99
- Copyright
- © 2026 @ 1'rie