Food Diary & Calorie Counter — with private history

Name: Food Diary & Calorie Counter — with private history
Author: Reactive

Keeping a food diary is the first step to really understanding your eating habits, but the most popular calorie-counting apps require an account and sync everything to a server. Here every meal stays saved **only on your device**: log what you ate meal by meal and the app works out each day's calorie total on its own.

▶ Use this app

food diarycaloriescalorie counternutritiondiet

What it records

Meal...
What you ate, e.g. Tomato pasta
Calories (kcal)

How it works

This is a Reactive app: a plain text document that your browser turns into a working app — forms, live data, tables, statistics and even charts, with nothing to install or configure.

Use it right away. Hit “Use this app”: it opens right in your browser, ready to go, with data saved only on your device.
Your data stays yours. Everything is stored locally on your device, kept separate for each app: no account, no server, nothing to set up.
Make it your own. The text below is the entire app: copy it, tweak fields, views and words, and your changes become interactive instantly.
Share it as a file. An app is a simple file: save it, export it or share it with a link; and with encrypted collaboration several people edit the same data in real time.

The app’s source

# 🍽️ Food Diary & Calorie Counter

Keeping a food diary is the first step to really understanding your eating
habits, but the most popular calorie-counting apps require an account and
sync everything to a server. Here every meal stays saved **only on your
device**: log what you ate meal by meal and the app works out each day's
calorie total on its own.

::::form{path="meals" id="fpa"}
::input{form="fpa" field="date" type="date" legend="Date"}
:::select{form="fpa" field="meal" placeholder="Meal..." required="true"}
- Breakfast
- Lunch
- Dinner
- Snack
:::
::input{form="fpa" field="food" placeholder="What you ate, e.g. Tomato pasta" required="true"}
::input{form="fpa" field="calories" type="number" placeholder="Calories (kcal)" required="true"}
::add-form{form="fpa" path="meals" label="Log meal"}
::::

## Meal history

:::table{path="meals" headers="Date,Meal,Food,Calories" deletable="true" editform="fpa"}
{date} | {meal} | {food} | {calories}
:::

## Daily calorie total

:::python{data="meals"}
```
rows = data["meals"]
totals = {}
for r in rows:
    d = r.get("date")
    cal = r.get("calories")
    if d and cal:
        totals[d] = totals.get(d, 0) + float(cal)

if totals:
    for d in sorted(totals):
        print(f"{d}: {totals[d]:.0f} kcal")
else:
    print("Log at least one meal to see each day's calorie total.")
```
:::

Keep the diary going for a few weeks to get a real picture of your habits:
the app doesn't judge portion sizes, that's on you — it just gives you the
numbers, in order, and they never leave your phone.