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

The concept is cool. The app not so much. The app is hard to navigate, there seem to be features missing from when I started, and their food library/AI feature doesn't function well. I like the videos and the content available, but the app is not efficient, which is a huge barrier to me using it. I also signed up for a 7-day trial and somehow got charged $100+ for a year's subscription of the app. When I asked for a refund, Google Play refused. Chronometer is free and functions way better.

The concept of the app is great, but execution is tough. Technically, it is very slow and glitchy, often throwing errors and inability to log foods. The favorites option also doesn't work, so you have to re-record the same foods that you eat all the time over and over again. I also think the auto-pilot assessment of your workout efforts is off. It often characterizes efforts as Z1 when other apps say Z3, for example, which obviously affects the macros it recommends.

Not a fan. Don't like the AI search bar. I also don't think the calories are right for target weight loss. Comparing to other apps, the other apps have me at less calories and have similar numbers. Not losing weight with this app. Other apps are free and better. Wish I could get my $100 back. Going back to MyFitness Pal.