Learn Sigma.

The same guide that ships inside the app, on the web. It teaches the app and never your diet: what you eat is your business.

guide 00

Log something fast

Tap a meal at the bottom of Today. The foods you eat most sit at the top under Frequent, and the + on a row logs one serving without opening anything else. That is two taps, and after...

guide 01

Why every number has a tilde

A calorie count is an estimate in every app, including the expensive ones. The database entry was measured on a different chicken than yours, the portion is a guess, and the oil in the...

guide 02

Portions, and the two kinds of cooked

Most foods come with household measures: a tablespoon, a stick, a large egg, an 8 oz steak. Tap one and the amount fills in. Quantity multiplies whichever one you picked, so three chops...

guide 03

Finding a food online

Search asks USDA and Open Food Facts. Curated whole foods rank above label submissions, and an entry that merely CONTAINS your food ranks below the food itself, which is why "oatmeal"...

guide 04

Ask Siri, or use a shortcut

Siri matches these phrases exactly, so they are printed here rather than left to guess. Close is not close enough: "my Sigma total" is not one of them and Siri will offer to search the...

guide 05

What Today shows

The donut is your day's calories, and the wedges are each macro's SHARE OF ENERGY, not its grams. Protein and carbs count 4 calories per gram, fat 9, so a small number of fat grams...

guide 06

Fasting

Off unless you turn it on in Settings, because it only means anything if you log at your eating times.

guide 07

Reminders

Off unless you turn them on, and you pick the times. Any meal can be set to Off, so skipping breakfast on purpose costs you nothing.

guide 08

Mirror, and what it won't say

Mirror reports patterns in what you already logged. It never predicts, never prescribes, and stays quiet when there isn't enough data to say anything honest.

guide 09

Your data

There is no account, and no server of ours. What you log lives on your phone and syncs through your private iCloud, which we cannot read.

guide 10

What Sigma won't do

No account, ever. No ads. No subscription treadmill.

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