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Questions answered within two business days

Common questions

The calorie estimate looks wrong

Open the meal and tell the coach what it got wrong — "there was more rice than that", "that was a large, not a medium". It re-reads the plate with what you've said and the corrected numbers replace the originals. Photos taken from above, with the whole plate in frame and decent light, are read far more accurately than close-ups or photos of half-eaten food.

It's also worth knowing that small, consistent errors matter much less here than they would elsewhere. Marble corrects your target against your actual weigh-ins, so if it reads your meals a little low every time, the target settles a little lower to match and your results still come out where you wanted them.

How are my targets worked out?

From your height, weight, age, sex and activity level Marble estimates what you burn at rest and across a day, then sets calories and protein against your goal. That first number is a guess — the activity question alone can move it by a few hundred calories.

So after about three weeks of daily weigh-ins, Marble compares what your weight actually did against what the target was built to produce, and changes the target to match. It'll tell you when it does, and say plainly that the first guess was off. You can override any target under Goals.

Can I log something without a photo?

Every meal starts with a photo at the moment. If a photo isn't practical, the closest thing is to snap what you can and correct it in the meal's conversation. Manual entry without a photo is on the list.

The scale went up but the app says I'm fine

Trust the line, not the morning. Day-to-day weight is mostly water, salt and what's still in your gut — easily a few pounds, which is far more than real weekly fat loss. Marble smooths your weigh-ins into a trend and judges progress on that, never on a single reading. On a morning the number jumps, it will show you what your trend actually did over the week.

I've hit a usage limit

AI analysis is rate-limited per device to keep costs sane and block abuse. It resets each day on its own. If you're hitting it in normal use, email and it'll get raised.

Do I need an account?

No. There's no sign-up and nothing to log in to — open the app and start. Your meals, goals and conversations live on your iPhone rather than in an account somewhere.

How do I delete my data?

Delete individual meals in the app, or delete the app itself to remove everything at once. Since none of it is stored on a server, there's no account to close. See the privacy policy for the detail.

Will my meals move to a new phone?

Only through an iPhone backup or device transfer, since everything is stored locally. There's no cloud sync yet, so a fresh install on a new phone starts empty.

Something's broken

Send what happened, what you expected instead, and a screenshot if you have one. Bugs that come with steps to reproduce them get fixed first, because they can actually be chased down.

A word on the numbers

Marble estimates. Even a good photo of a mixed dish leaves real uncertainty about oil, portion size and what's underneath — which is why every estimate is exactly that. Treat it as a well-judged approximation you can correct, not a measurement. It is not medical advice; if you have a health condition or a history of disordered eating, talk to a doctor or a registered dietitian.