Build a Calorie Tracker for Intermittent Fasting (2026)

If you’re doing intermittent fasting, you don’t just want calories — you want to know exactly when and what you ate, and whether it fit your window. Instead of hunting for the perfect app, you can build your own in Auto in a few minutes.

Why build instead of download

There are plenty of options if you search for the best calorie tracking apps for intermittent fasting. Most are fine. But every generic intermittent fasting tracker app makes assumptions about your goals, your macros, and how you like to log — and you end up bending your routine to fit the app.

Auto flips that. You describe the tracker you want, snap a photo of your meal, and Auto builds you a personal mini-app (a “Frame”) around it. It fits your fasting schedule and your targets exactly, because you told it what to do.

Building it in Auto

Here’s the basic flow:

1. Open Auto and describe your tracker: “a meal tracker that reads my food photos and estimates calories, protein, fat, and carbs.”
2. Add the screens you care about — today’s meals, history, trends, and a settings screen for your own targets.
3. Snap or describe a meal. Auto estimates the macros from the photo.
4. Tweak anything in plain language until it feels right.

No code, no app store, no settling. People have already built exactly this — a Frame called Meal Tracker is one real example.

How someone built theirs

One Auto user built a full calorie tracker this way, and their prompts are a good blueprint.

They started with the core: a meal-tracking app that analyzes food photos and pulls primary stats (calories, protein, fat, carbs) plus secondary stats (fiber, sugar, sodium). They laid out four screens — today’s meals with daily progress, a history screen you can tab through day by day, a trends screen with 7- and 30-day bar charts, and a settings screen for personal targets.

From there it was all refinement:

• Added manual logging by free text or by just telling Auto what they ate.
• Added push notifications at meal times.
• Made each meal open a full detail page with a full-bleed cropped photo.
• Asked for bigger, chunkier stat numbers, then macro icons and a card around the calories to make the detail page prettier.
• Fixed a real time-zone bug so meals landed on the correct local day.
• Let the AI chat read and edit meals, settings, and goals directly.

They also hit ordinary polish issues — content hidden behind the tab bar, padding that needed fixing — and worked through them by just describing the problem. That’s the point: you don’t need to be technical, you just need to know what you want.

FAQ

Do I need to count calories manually? No. Auto estimates macros from a photo. You can also type or say what you ate if you’d rather not take a picture.

Can I set my own targets for a fasting window? Yes. You build the settings screen yourself, so your calorie and macro goals are whatever you decide.

How long does it take to build? The core tracker takes a few minutes. Most of the time above went into optional polish, not the essentials.

Is it accurate? Photo estimates are approximations, like any tracker. For anything important, treat the numbers as a guide.