A calorie app asks for a lot of trust: what you eat, what you weigh, and a number it tells you to live by. So here's how Marble does things, with the numbers, the method, and the parts that don't flatter us. Each page is short, every number says when it was measured, and each page lists what changed and when.
- Eating disorders and safety The rules the AI can't talk its way past, what happens when food seems to have become hard, how we red-team the coach, and what we haven't solved.
- How accurate is a photo? 17,017 practice reads on weighed public datasets, what helped and what didn't, and why most accuracy claims can't be trusted.
- The open benchmark A fixed photo-to-calories test anyone can run, with frozen rules and scoring code. Marble's reader takes it like everyone else's.
- How your target is set, and then corrected The formula is the opening guess. Your weigh-ins correct it. The full rule, and how it did on 5,000 simulated people.
- What the AI does, and what it doesn't Code computes every number; the AI reads plates and explains. Which models, where the coach's food numbers come from, and how we check it.
- Sources and methods Every equation and guideline behind Marble's numbers, with links to the original research. The same list the app shows.
- Privacy No account. What stays on your phone, what's sent to AI and only after you agree, and how to delete all of it.
Spotted something wrong, or want to test Marble yourself? Write to support@getmarble.app.