Build a Nutrition App in 21 Days
Meal logging, macro tracking, AI meal plans, and barcode scanning — shipped at a fixed price.
Why Nutrition App development is hard to get right
Food database APIs (Nutritionix, USDA) have inconsistent data — normalization layer is essential
Barcode scanning requires native camera modules and a reliable product database
AI meal plan generation needs prompt engineering + user preference storage — not just a GPT wrapper
Nutrition apps have brutal retention curves — meal logging friction on Day 3 kills 60% of users
What we build — in detail
Food logging
Search 900K+ foods via Nutritionix API. Recent foods, favorites, custom recipes, portion size picker.
Macro & calorie tracking
Daily targets for calories, protein, carbs, fat. Progress rings, weekly averages, goal adjustment.
Barcode scanner
Scan packaged foods → auto-populate nutrition data. Fallback to manual entry.
AI meal plans
GPT-4 generates weekly meal plans based on goals, allergies, preferences, and calorie target.
Recipe builder
Create custom recipes, auto-calculate per-serving macros, share with community.
Progress photos
Weekly progress photo log with side-by-side comparison view.
Subscription monetization
RevenueCat for premium features: AI meal plans, advanced analytics, coach access.
Tech Stack
- →React Native + Expo
- →Supabase
- →Nutritionix API
- →OpenAI GPT-4
- →RevenueCat
- →Expo Camera
What you get
- iOS + Android app
- Admin panel
- Full source code
Frequently asked questions
Which food database API do you use?
Nutritionix for US/international packaged and branded foods. USDA FoodData Central as fallback for whole foods. We normalize both into a single search interface.
Free Nutrition App resources
Download these before you start — no credit card, just your email.
Planning your build?
Related app types
Ready to build your nutrition app?
Book a free 30-minute scoping call. We'll map out exactly what v1 looks like, give you a fixed price, and start within a week.
Book a Free Scoping Call →Free · No commitment · Delivered in 3–4 weeks