Fuelin Performance Nutrition

Thrive AI Labs, Inc.

In-app purchases

About this app

Fuel smarter, train stronger, and perform better with Fuelin — the world’s first adaptive nutrition coach built for active individuals. Whether you’re running, cycling, swimming, lifting, or training for your next big race, Fuelin tells you exactly what to eat, when to eat it, and why it matters.

Designed by world-class dietitians and trusted by thousands of athletes and fitness enthusiasts worldwide, Fuelin adapts your nutrition to your training, goals, and lifestyle — taking the guesswork out of eating for performance, health, and recovery.

How Fuelin Makes Nutrition Simple
• Fuelin builds a daily nutrition plan just for you — synced to your TrainingPeaks, TriDot, RunDot, HumanGo, or Final Surge workouts. No platform? Just add workouts manually and get tailored guidance.

• Logging food is simple and fast to save you time. Talk or type with our AI logger, scan a barcode, or connect MyFitnessPal and LoseIt — no more tedious tracking.

• Go beyond calories with smarter tools. Stay on top of hydration with our Sweat Rate Tracker and train your gut with Carb Capacity Testing.

• Gain real nutrition skills. Learn portion control, supplement use, and energy balance through in-app lessons and videos designed to build lasting healthy habits.

Why Fuelin?
• Proven results. Thousands have discovered they can recover faster, lose weight, gain muscle, feel healthier, and have more energy for both daily life and race day.

• Simple and personalized. No generic diet rules here. Fuelin adapts every single day to your training, goals, and body.

• Takes out the guesswork. Save time and remove the anxiety of fueling. Fuelin gives you trusted advice so you can fuel with confidence.

• Personalized nutrition and fueling guidance for every sport and race you take on. From running, trail running, cycling, swimming, rowing, sailing, and skiing, to racquet sports, Hyrox, marathons, half marathons, triathlons, Gran Fondos, century rides, gravel cycling, criteriums, IRONMAN 140.6 and 70.3, and more — Fuelin adapts your fueling to match your training and goals.

What our members are saying about Fuelin:

"Fuelin is the daily companion to take the guess work out of nutrition that I wish I had earlier in my career.” - Jan Frodeno (3x IRONMAN World Champ)"

"Fuelin has helped me nail my nutrition, not only for my sport, but for my overall health. This app is a game-changer for endurance athletes!" - Colleen Baker (Gravel Cyclist)

"Helps me build awareness and healthy habits, removing the worry and helping me keep on track!" - Rob Castaneda (Age Group Triathlete)

"Before finding Fuelin I wasn't aware that a system existed that could accurately account for my training on a day to day basis based on the training my coaches set for me. It just takes the guesswork out of the whole process and has empowered me to properly fuel my body. I've felt increased energy, better recovery and more consistency. Also, practicing my race nutrition in training has led to greater confidence in my plan and becomes more second nature so that I can make sure l hit it in a race.” - Holly Lawrence (Pro Triathlete)

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Medical Disclaimer: Seek a doctor’s advice in addition to using this app and before making any medical decisions

U.S. Barcode Food Database Powered by FatSecret: https://fatsecret.com
International Barcode Food Database Powered by Open Food Facts: https://openfoodfacts.org

Ratings and reviews

This app is so cumbersome and difficult to use. I can't change my portion sizes; for example, if I have a piece of chicken, the app assigns it as 1 piece = 85g and I can only change the number of pieces I eat instead of the portion size. There is no place to edit recipes I've built until I log it. The screen is very cluttered. I can't add a snack if it isn't already listed on my plan. I love the idea of this app but it is a hot mess. I'm going back to MyFitnessPal.

Possibly the worst nutrition app I have ever used. It's really disappointing because the concept is great, I think the AI involved with the meal macro selections based on training plan is really neat. Overall the app is so slow, it shouldn't take 5-10 minutes to log a meal or snack every single time. The database for items is drastically wrong and needs to be constantly checked for accuracy leading to distrust of the system as a whole. Probably going to get refunded because of the app.

The macros and calories prescribed are legit but you could arrive at this info on your own. The app is intended to make it easier and does to some degree. Unfortunately, the app just runs poorly. There are some positives but the negatives are starting to outweigh them for me. The app is slow and every few days, it fails to load. I have to restart my phone to get the app to work. I don't have this issue with any other apps. I doubt I'll renew when my subscription ends.

What’s new

What's New
• V.O2 Integration (Early Access)
• Added search to Recents, Favorites, and Recipes, finding your go-to meals is faster than ever
• Unrecognized barcodes can now be added and recognized in future scans
• Edits to barcode entries are now saved for future scans
• The app now automatically opens to your weekly nutrition plan at the start of each week
• Race and event macros totals are now displayed directly within the race/event card in your daily plan