Ask anything about
what you eat.
Marble's coach looks it up, does the math, and shows every step.
- That's an iced latte, about 12 oz. Let me look up the numbers.
- Searched “iced latte 12 oz nutrition”6 sources
- Read a nutrition page
- Logged iced latte · 190 cal · 11 g proteinUndo
Logged it. You've got 1,790 cal left for the day.
The coach
One loop. Any question.
Recorded in the app. Photos: JimmyStardust (CC BY-SA 4.0), Joey Coleman (CC BY-SA 2.0), via Wikimedia Commons.
The target
A starting guess.
Then, your real number.
Weigh in each morning. After two weeks, Marble moves your target to match what your body actually does.
- Planned
- −1.1 lb / wk
- Measured
- —
- Weigh-ins
- 1
Day one. The target is arithmetic, and arithmetic can be wrong.
Code does the math
The coach cites your numbers. It never makes one up.
Every step shown
Each lookup, each source, and Undo on anything it saves.
Care built in
Hard moments get a helpline, not a number.
Pricing
Free to start. Plus to go further.
Free
$0
- 3 photo reads a day
- Unlimited typing, barcodes, repeats
- Your trend and every correction
Plus
$4.99/month
- The coach
- Every photo read by Claude Sonnet
- Corrections to any meal
First two weeks free. No card.
Questions
Where does my data go?
Weigh-ins stay on your phone. Photos, coach messages and the figures the coach looks up to answer go to Anthropic for processing and aren't stored. More on the privacy page.
How accurate is a photo?
An estimate. Published nutrition beats a guess, so the coach looks it up when it can, and you can always correct a meal.
Is it right if I've struggled with food?
Talk to a doctor or dietitian first. Marble never celebrates a number, but it still counts, and counting isn't right for everyone.
Stop guessing.
Start asking.
Get Marble
For iPhone, with no account