PlateMath: Snap Calories

Turn a meal photo into a private on-device estimate, then compare it with labels, weighed portions, or later knowledge in the new Calibration Lab.

PlateMath is a private, on-device meal photo estimator and comparison journal for everyday nutrition awareness.

Photograph a meal and PlateMath produces a readable calorie range, food breakdown, macro estimate, and confidence context without uploading the photo to a developer server. Apple Intelligence is used when available; a deterministic local Vision workflow keeps the core experience useful on supported devices when the model is unavailable.

PHOTO-BASED MEAL ESTIMATES

• Capture a meal with the camera
• Review detected foods, portions, calorie ranges, and macros
• See low-to-high ranges instead of a false exact number
• Check confidence and uncertainty before saving
• Review hidden-calorie prompts and macro cross-checks in Estimate Audit

NEW: CALIBRATION LAB

• Revisit any saved estimate after learning more about the meal
• Record whether the estimate seemed high, low, or close
• Add an optional known calorie total from a label, weighed portion, recipe, or other evidence
• Save confidence and notes in a private comparison journal
• See aggregate evidence count, confidence, and known-value bias over time
• Delete individual reviews or clear them with their linked meal history

HISTORY AND TRENDS

• Save meal notes and estimates locally
• Review daily calorie and macro totals
• Explore seven-day trends and recent meals
• Set a personal daily reference goal
• Schedule optional local meal reminders

TRANSPARENT BY DESIGN

• Public USDA and FDA nutrition references are linked in Settings
• No account, subscription, ads, analytics, or developer-operated server
• Meal photos, estimates, history, and calibration reviews remain on the device
• No automatic model training from your calibration journal

PlateMath provides general nutrition estimates for informational use only. Photo-based estimates can be wrong and are not a substitute for food labels, measured portions, or professional dietary or health guidance.