Track your calories
with just a photo
Snap a photo, describe your meal, or scan a barcode. Calvin instantly breaks down calories, protein, carbs, and fat — no manual entry needed.
How it works
From photo to nutrition facts in seconds
Log your food
Take a photo of your meal, type a description, or scan a barcode. Calvin handles it all.
Get instant nutrition
AI identifies every item on your plate and calculates calories, protein, carbs, and fat instantly.
Track your progress
See your daily progress, macro breakdown, and weekly trends. Hit your goals with clarity.
Everything you need to track smarter
Built for people who want results without the busywork
AI Photo Analysis
Snap a photo and Calvin identifies every food item, portion size, and cooking method. Works with home-cooked meals, restaurant food, and packaged snacks.
Smart Text Entry
Type “coffee with oat milk” or “chicken stir fry with rice” and Calvin understands. No searching through endless databases.
Daily Journal & Insights
See your meals laid out like a visual diary. Browse past days, track streaks, and reflect on your eating patterns with a beautiful calendar view.
Water Tracking
Track your daily water intake alongside your calories. Set goals, log glasses with a tap, and stay on top of your hydration.
Why Calvin?
Most calorie trackers make you search databases and enter every detail by hand. Calvin takes a different approach.
Seconds, not minutes
Photo analysis takes seconds. No scrolling through food lists, no weighing ingredients, no guessing serving sizes.
Actually accurate
Multi-model AI pipeline that identifies individual items, understands portions, and cross-checks for accuracy.
Privacy-first
Your food data stays yours. No ads, no selling your data, no dark patterns. Just a clean tool that helps you eat better.
Unlock your full potential
Get unlimited AI photo scans, advanced insights, priority support, and more with Calvin Pro.
Free Nutrition Tools
TDEE Calculator
Calculate your daily calorie needs based on your goals
Macro Calculator
Get personalized macro splits for your diet
Body Fat Calculator
Estimate your body fat using measurements
Protein Calculator
Calculate optimal protein intake for muscle
Deficit Calculator
Find a safe calorie deficit for weight loss
Recipe Calculator
Get nutrition facts for any recipe
Food Calorie Database
Browse all foodsCalories Burned by Exercise
Browse all exercisesFood Comparisons
See all comparisonsFrom the Blog
The Complete Guide to Calorie Counting
Master the fundamentals of calorie counting with our science-backed guide for weight loss, muscle building, or mindful eating.
What Is a Calorie Deficit?
A calorie deficit is required for fat loss—but how big should it be? Learn the science and how to set the right deficit.