PlateMath: Snap Calories

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.