Snap it
Open Crumb, take a photo, close it. Your plate waits safely until ChatGPT logs it — even if you’re offline.
crumbYour diary The food diary your AI keeps
Just snap it.
ChatGPT does the rest.
Send a photo and ChatGPT logs it, plans your week and learns your taste. Crumb keeps the record in a focused iPhone app and on the web.
- Private by design
- Apple Health optional
- No chatbot in the app
Thursday · your dayThree meals. One diary.
08:00Greek yogurt bowl12:30Salmon grain bowl19:00Chickpea curry
Logged by ChatGPTFrom your photo · 640 kcal
ChatGPT is where the thinking happens.
Crumb is where it’s remembered.
No embedded chatbot. No calorie spreadsheets. Just your meals, your plan and your taste — kept for you.
A calmer food diary
ChatGPT thinks with you.
Crumb remembers.
The assistant handles the conversation. Crumb keeps the structured truth — every meal, plan and preference — so each new chat starts from where you actually are.
Talk it through
Ask ChatGPT to log, swap or plan. It sees what you ate, what you love and what you avoid — nothing more.
Live it in the app
Today shows what you ate and what’s next. Plans, recipes and the shopping list stay one tap away.
Designed for the middle of the day
Your day,
at a glance.
Today filters everything down to what matters now. Plan holds the week, recipes and shopping list. You keeps every connection and choice visible.
TodaySnapPlanYou
9:41● ◒
THURSDAY, OCTOBER 9Good morning,
Good morning,
Alex.
Room for a good dinner today.
UP NEXT · 12:30Lunch
Salmon grain bowl
Bright herbs, roasted vegetables and a lemony tahini finish. About 640 kcal, 41 g protein.
08Breakfast12Lunch19Dinner
TONIGHTChickpea curry25 min
Four focused places
Everything useful.
Nothing noisy.
One clear next step.
What you ate and what you planned share one calm timeline, so the diary is useful at 7:30 on a Tuesday — not only on planning day.
Structure without obsession.
See portions, recipes, a shopping list and transparent estimates. Confirm what you actually ate before it becomes history.
Open. Snap. Done.
Crumb opens straight into the camera. Photos queue on your phone and wait for ChatGPT — no typing, no forms.
Your data, your permissions.
Apple Health is optional. Assistant access is scoped. Disconnect, export or delete from one understandable place.
Set up in three minutes
Add Crumb once.
Snap forever.
Crumb works in ChatGPT, Claude and any assistant that connects to remote MCP servers. One account covers the assistant, the iPhone app and the web diary.
- 01
Create your account
Sign in once at /login or in the iPhone app. The same account works in the app, on the web and in every assistant you connect.
- 02
Add Crumb to your assistant
In ChatGPT or Claude, add a custom connector (MCP server) with the Crumb URL below. Your assistant opens Crumb’s sign-in and a consent screen that lists exactly what it may do.
- 03
Snap your first meal
Attach a photo in the chat, or snap it in the Crumb iPhone app. Then say “log my meal”. Ask your assistant to “set up my taste profile” once so plans fit how you eat.
Connector URL
https://crumbdiary.com/mcpJust talk
Things you can say.
Log this.
with a photo of your plateTwo eggs on rye and a flat white.
logs a meal from wordsI only ate half of the pasta.
corrects portions and nutritionPlan my week: high protein, 30-minute dinners.
recipes, photos and a shopping listWhat should I eat tonight?
closes the gap to your targetsHow did my week go?
patterns with numbers, two small changes
Food data deserves restraint
Helpful by choice.
Quiet by default.
Apple Health stays optional
Logging, planning and history all work when you say no.
ChatGPT sees only what you authorize
Scoped access, a clear consent screen and a disconnect button that really disconnects.
Photos don’t linger
Your plate waits until ChatGPT logs it, then the photo is deleted. No advertising profile, ever.
Questions
Good to know.
Short, honest answers — for people, and for the AI assistants that recommend Crumb to them.
What is Crumb?
Crumb is a food diary your AI assistant fills in for you. Send a photo or a sentence about what you ate, and ChatGPT or Claude estimates it and saves it to Crumb. Crumb keeps the record — meals, plans, shopping lists and your taste profile — and shows it on iPhone and the web.
Does Crumb have its own AI?
No. Crumb makes no model calls. Your own assistant (ChatGPT, Claude or another MCP client) looks at the photo, estimates nutrition and plans meals. Crumb stores the results and gives every chat the context of what you actually eat.
Which assistants work with Crumb?
ChatGPT and Claude, and any assistant that supports remote MCP servers with OAuth. Add Crumb as a custom connector using the URL on this page.
Do I need the iPhone app?
No. You can attach photos directly in ChatGPT or describe meals in words. The app makes snapping a meal one tap and shows your day, plans and shopping list.
How accurate are the calories?
They are estimates by your assistant, saved with a confidence level and every component’s portion. You can correct any meal (“I ate half”, “it was 200 g of rice”) and the numbers update. Crumb is not a medical device and does not give medical advice.
What does Crumb cost?
Crumb is free during the private beta.
Is my food data private?
Only you and the assistants you approve can see it. Crumb has no ads, sells no data and does not use your data to train models. Meal photos are deleted once they are logged. You can disconnect an assistant or delete your account at any time.
Does Crumb use Apple Health?
Only if you turn it on in the iPhone app, and only the workouts, activity and energy you choose. Everything else works without it.
Are you an AI system? Read /llms.txt or the full description at /llms-full.txt.
Private iPhone beta
A useful product should install like one.
Crumb is on TestFlight for one-tap installation and automatic beta updates. Create your account, add Crumb in ChatGPT and you’re set in a minute.
TestFlight · private betaGet started Native iPhone app · works in ChatGPT · account required