Callie — The calorie tracker that knows what week you're in

Why Callie exists

You're not failing the plan. The plan was wrong.

Your metabolism, hunger, and water weight shift every week of your cycle — sometimes by hundreds of calories. Generic trackers hand you one number and call it a day. Callie rebuilds that number around the week you're actually in, so the plan finally matches the body following it.

Static calorie targets

One number, every day, no matter what week of the month you're in.

Scale spikes read as failure

Water weight gets flagged as fat gain. Two bad days end a month of work.

Cravings treated as willpower

Luteal hunger isn't a character flaw. It's biology your tracker is ignoring.

Built for the weeks other apps ignore

Built around how your body actually works.

Four phases. Four sets of targets. One app that keeps up.

Menstrual

Gentle reset.

Lower output days. Easier targets, iron-forward macros, no pressure to push.

Focus Iron · Protein

Follicular

Rising energy.

Your body is primed to train. Protein-leaning macros, leaner deficit, real momentum.

Focus Protein · Carbs

Ovulatory

Peak output.

Highest performance window. Fuel the workouts, hit the macros, ride the wave.

Focus Performance fuel

Luteal

Planned-in cravings.

BMR climbs. So do your targets. More carbs, more food, fewer apologies.

Focus Carbs · Magnesium

Progress without panic

The scale finally makes sense.

Trend averages, cycle bands, and phase context — so a Tuesday spike doesn't undo a month of progress. See what's water, what's food, and what's actually fat loss.

7-day rolling trend Cycle-adjusted average Phase band overlay

Callie weight trend chart with cycle-phase bands overlaid

Logging that doesn't get in the way

Log a meal in seconds.

Scan the plate, snap the barcode, or search. Callie does the macros — you get on with your day.

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AI photoPoint your camera at a meal. Get calories and macros instantly.

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AI textDescribe what you ate in plain English. Callie does the macros.

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ManualSearch the database or save your usuals. Re-log in two taps.

Your cravings are not a character flaw

The luteal week, finally accounted for.

In the week before your period, BMR climbs and hunger rises — that's physiology, not weakness. Callie raises your calorie target and shifts your macros so the cravings are planned in, not fought through.

Personalised to your body More carbs, less guilt Magnesium reminders

↑your BMR rises in luteal phase — your targets should rise with it

Standard trackers ignore the shift. So you end the day hungry, eat past the target, and feel like you failed. Callie recalculates your number around your weight and phase — and gives those calories back.

How Callie adapts

Not a chatbot. A model tuned to cycle physiology.

Callie reads your cycle, your logs, and your trend — and re-tunes your plan every day.

①

Phase detection

Learns your cycle length from your logs and period tracking — no manual upkeep.

②

Adaptive targets

Recalculates calories and macros each phase. Today's number reflects today's body.

③

Trend bands

Separates water from progress with cycle-aware smoothing. The scale tells the truth.

④

Phase-aware nudges

Different tone, different ask, by week. Push when it helps. Soften when it matters.

Good question

The bits people ask first.

Is Callie free to try?

Yes — Callie includes a 3-day free trial through the App Store. After that it's a single subscription, managed by Apple, cancel anytime.

Do I need to track my period for this to work?

A start date is enough to begin. Callie improves the longer you use it — the more cycle data you log (or sync from Apple Health), the more accurate phase detection and target adjustments become.

What if my cycle is irregular?

Callie handles variable cycle lengths and learns your personal pattern over time. Targets adapt as your cycle does. If you're on hormonal birth control, Callie can switch to a steady-state mode.

How is this different from regular calorie trackers?

Standard trackers give you one number forever. Callie shifts calories, macros, and the way your weight trend is interpreted across your menstrual, follicular, ovulatory, and luteal phases — because your body does.

Does it work with Apple Health, Oura, or Whoop?

Yes. Callie reads from Apple Health (cycle, weight, activity) and works alongside Oura, Whoop, and Garmin for context. We never sell your data.

Can I cancel anytime?

Yes. Subscriptions are billed and managed by the App Store — cancel in two taps from your iPhone settings.

Ready when you are

Start tracking with your cycle, not against it.

3-day free trial. Cancel anytime through the App Store.

Download on the
App Store ★ 4.9 · App Store

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