Build Muscle with Precision Nutrition
You can't out-train a bad diet. Macro Maxxing tracks your bulking calories and protein with AI precision — just snap a photo or say what you ate. Build streaks, earn XP, and compete with other lifters on the leaderboard.
Start Building — FreeNutrition Is 80% of Muscle Building
Training provides the stimulus, but nutrition provides the raw materials. Without adequate calories and protein, you won't grow — period. A calorie surplus of 200-400 kcal combined with 1-1.2g protein per pound of bodyweight is the sweet spot for lean muscle gain.
Macro Maxxing makes tracking your bulk effortless. AI scans your food photos and uses Claude AI with USDA-verified data to give you accurate macros. Smart workout adjustments ensure your daily targets account for training days vs rest days.
Features for Lifters
AI Meal Scanning
Photo your meal — AI calculates protein, carbs, fat, and total calories. Works with meal prep, restaurants, and homemade food.
Workout Macro Adjustments
Log a strength session and your daily macros adjust automatically. More carbs and protein on training days, maintenance on rest days.
Voice Logging
Post-workout, just say 'protein shake, two scoops, with a banana and oats' — AI logs everything while you recover.
Bulking Streaks
Build a streak by hitting your calorie surplus every day. Consistency is everything in a bulk — streaks keep you disciplined.
Lifter Leaderboard
Compete with other lifters on the leaderboard. Earn Aura XP for hitting protein targets, logging workouts, and maintaining streaks.
Gym Community
Share meals and progress on the social feed. Follow other lifters, swap recipes, and hold each other accountable during your bulk.
Bulking Protocols You Can Track
Lean Bulk
+200-300 kcal1g/lb proteinSlow, controlled surplus that minimizes fat gain. Ideal for experienced lifters who want to stay relatively lean while adding muscle.
Standard Bulk
+400-500 kcal1g/lb proteinModerate surplus for optimal muscle growth. The most common approach that balances muscle gain with manageable fat gain.
Aggressive Bulk
+600-800 kcal1-1.2g/lb proteinLarger surplus for beginners or hardgainers who struggle to eat enough. Maximize muscle growth at the cost of some extra fat gain.
Body Recomposition
Maintenance1.2g/lb proteinEat at maintenance while training hard. Build muscle and lose fat simultaneously. Best for intermediate lifters or those returning from a break.
Frequently Asked Questions
What is the best nutrition app for building muscle?
Macro Maxxing is the best free nutrition app for building muscle. It uses AI photo scanning to track calories and protein effortlessly, automatically adjusts macros on training days, and keeps you consistent with daily streaks, Aura XP leaderboards, and a social community of lifters.
How many calories should I eat to build muscle?
To build muscle, eat 200-500 calories above your maintenance level (TDEE). A lean bulk uses a smaller surplus (+200-300) to minimize fat gain, while a standard bulk uses +400-500 for faster muscle growth. Macro Maxxing helps you track your surplus precisely with AI food scanning.
How much protein do I need to build muscle?
Research consistently shows 0.8-1.2 grams of protein per pound of bodyweight is optimal for muscle growth. Macro Maxxing puts protein tracking front and center and makes it easy to hit your daily target with AI-powered logging.
Does Macro Maxxing adjust macros for workout days?
Yes. When you log a workout in Macro Maxxing, your daily macro targets automatically adjust based on the type and intensity of your session. Strength training adds extra protein and carbs, while rest days use your baseline targets.
Fuel Your Gains
AI nutrition tracking built for lifters. Streaks, leaderboards, and a community of dedicated trackers. Free forever.
Download on the App StoreFree to download. iOS 17+ required.