Before you start

Terms & Privacy

Please read this before using Macro scanner

Not medical advice

This app is a general educational tool for estimating calorie and macronutrient intake. It is not a substitute for professional medical, nutritional, or dietary advice, diagnosis, or treatment. Talk to a physician, registered dietitian, or other qualified health provider before starting any diet, exercise, or weight-management plan — especially if you have an existing medical condition, are pregnant or nursing, or are under 18.

Estimates only, not guarantees

Calorie and macro targets are calculated from standard published formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, Owen) and general activity assumptions. Real energy needs vary by person — treat these numbers as a starting point, not a precise medical measurement.

AI-read and AI-estimated values can be wrong

Nutrition values from photo scanning and from the AI ingredient assistant are generated by an AI model and may contain errors, including for allergens or ingredients that matter medically. Always check the actual product packaging or a trusted nutrition source before relying on this data for a health-critical decision.

Not intended for eating disorders

This app is not designed for, and should not be used by, anyone currently experiencing or at risk of an eating disorder. Tracking calories and macros can be harmful in that context. If this may apply to you, please don't use this app and speak with a healthcare professional instead.

Your data stays on your device

Your profile, food logs, saved meals, calendar, recent scans, and photo thumbnails are stored locally on your device — not on a server we control, and not backed up by us. This data now persists across app restarts and updates. Uninstalling the app, or clearing its storage, permanently deletes it — we have no way to recover it, because we never had it.

What gets sent to our AI provider

When you scan a photo or type a food description for an AI estimate, that photo or text is sent through our server to Anthropic (the company behind the Claude AI models we use) to generate a response. For packaged products, this may also involve an automated web search for that product's published nutrition facts. This is not linked to your name or profile — we don't attach your identity to these requests. We don't control how long Anthropic retains this data on their end.

Anonymous usage tracking

To enforce the free monthly scan limit fairly, your device is assigned a random identifier, and our server keeps a simple count of scans against it for the current month. This identifier isn't linked to your name, email, or any account — there are no accounts in this app.

What we don't do

No account creation or sign-in, no selling your information, no advertising or ad-tracking, and no server-side database of your personal profile, food logs, or photos.

No liability

This app is a prototype provided "as is," without warranties of any kind. Its creators are not liable for decisions made, or outcomes resulting from, use of this app or reliance on its estimates.

Age requirement

This app is intended for users 18 years or older. If you are under 18, please use it only with the guidance of a parent, guardian, or healthcare professional.

I have read and understood the above, and I agree to use this app at my own discretion and risk.

How it works

Understanding your calculations

Exactly how your calorie and macro targets get calculated

The big picture

Your daily calorie target starts from your BMR (Basal Metabolic Rate) — roughly what your body burns just existing, with zero movement, based on your age, sex, height, and weight. From there, an activity multiplier accounts for movement on top of that baseline, giving your TDEE (Total Daily Energy Expenditure). Your goal (lose, maintain, gain) then shifts that number up or down. Finally, your macro split turns the resulting calorie number into grams of protein, carbs, and fat.

Lifestyle

This is your baseline movement outside of workouts — sometimes called NEAT (non-exercise activity thermogenesis). A desk job (1.2×), being on your feet often (1.375×), or a physically demanding job (1.55×) all burn meaningfully different amounts of energy across an ordinary day, before a single workout is counted. This multiplier is applied to your BMR every single day, since it reflects how your day-to-day life works, not something that changes based on whether you hit the gym.

Weekly exercise (your baseline)

The exercise days you set up in Settings represent a typical week for you — this becomes your baseline target, the number shown before you've confirmed a daily check-in, or on any day you skip the check-in entirely. It works by adding up your weekly training volume (how many days of each activity, weighted by duration and intensity) and using that to bump your activity tier up from Sedentary toward Athlete (a range of 1.2× to 1.9× of your BMR). Unlike the daily check-in below, this baseline blends your lifestyle and your typical exercise together into one combined weekly-average multiplier — it's a reasonable estimate for "a normal week," but it can't tell the difference between a rest day and a leg day.

Today's activity (daily check-in)

This is what actually makes your day-to-day numbers more accurate. Once you confirm what you did today, the app throws out the weekly-average guess for that day and calculates something more specific: your BMR × your lifestyle multiplier (the baseline from above, with no exercise folded in), plus a separate calorie estimate for each activity you checked off today. Each activity type has its own rough calories-per-session estimate, adjusted by how long you did it (under 30 min, 30–60 min, or 60+ min). A rest day only gets the lifestyle multiplier — no bonus calories. A day with lifting and a run gets the lifestyle multiplier plus both of those activities' estimated burn, added directly on top. This is why two different days can show two different calorie targets, even with everything else the same — it's supposed to.

Today's weight

BMR depends on your weight, so if you enter today's weight during the check-in, that day's BMR is recalculated using that number instead of the weight from your original setup. This matters most if you're actively losing or gaining — your BMR genuinely shifts as your weight does, so keeping it current keeps your target accurate as you progress. Leaving it blank just falls back to your onboarding weight for that day.

Your goal — lose, maintain, or gain

Once TDEE is calculated (whichever version — weekly baseline or today's specific number), your goal shifts it by a flat amount: losing weight subtracts 500 calories (a pace of roughly 1 lb per week), maintaining makes no change, and gaining muscle adds 350 calories — enough to support growth without piling on excess fat. This adjustment always happens last, after activity is already factored in.

Macro split

Your split (like 40% protein / 30% carbs / 30% fat) doesn't change your total calorie target — it only decides how those calories get divided into grams. Protein and carbs are both roughly 4 calories per gram; fat is roughly 9 calories per gram, since it's more energy-dense. So a higher-fat split needs fewer total grams to hit the same calorie share, while a higher-protein or higher-carb split needs more. Changing your split changes the grams on your rings and totals, but the calorie number at the center stays the same unless your goal, activity, or weight changes it.

🎯

Welcome to Macro Scanner

Scan your food, track your macros, and hit your targets — let's get your profile set up. Takes about two minutes.

Your macro goal

Today's Plan

Log, plan, and manage what you're eating today

Scan

Photograph a label, a whole food, or a packaged product

Take or upload a photo

Labels, whole foods, and packaged products all work

Logged today

Nothing logged yet — scan a label to start

Recently scanned

Prototype only. Values come from an AI reading the photo, estimating whole foods, or searching the web for packaged products — any of these can be wrong. Always check against the real label for anything medically important, like allergies. Calorie and macro targets are estimates (Mifflin-St Jeor formula), not medical advice.

Your meals

Create and edit meals you can assign to any day

Create a meal

Meal name

Calendar

Pick a day to see or add meals

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SMTWTFS

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Plan & usage

Unlimited label scans and AI ingredient estimates with Pro

This month's usage

Free

$0

20 AI scans / estimates per month
Unlimited manual meal tracking
Full calendar & meal planning

Pro

Price TBD

Unlimited AI scans & estimates
Everything in Free
Priority support

Payments aren't connected yet — this app is still in development. Real subscriptions go live once this is published to the App Store / Play Store.

Developer testing only

Simulate an active Pro subscription (for testing — not a real purchase)

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