For iPhone · Fourteen days free
CoreFuel breaks a photo, or a sentence, into named items with calories and macros for each. Correct what it got wrong and it lands on your day. Then it plans the week around it: meals at your targets, workouts that progress, and an estimate of your body from three photos.
Fourteen free days on every new account. Nothing to enter.
| Item | Calories |
|---|---|
| Cooked salmon 180 g | 370 |
| Baby potatoes 250 g | 193 |
| Green beans 150 g | 47 |
| Soft-boiled eggs 2 large | 144 |
| Cherry tomatoes 120 g | 22 |
| Red onion 60 g | 24 |
| Black olives 30 g | 35 |
| Olive oil dressing 1 tbsp | 119 |
| Lunch | 954 kcal |
Nobody lists the dressing. It was read from the dish and counted, and like every item it is yours to change or remove.
The log button
The fast ways in. Whichever you use, the estimate arrives as named items, each with its own calories and macros, and every one is yours to change before it counts.
Whole plate in frame. Shoot from where you sit; we correct for angle, not for a missing edge. Items you did not photograph but must have eaten, like the oil the rice was cooked in, are listed at lower confidence so you can keep or remove them.
Anything that comes back above 1,000 kcal is refused and the plate is re-examined by a larger model. Totals are recomputed from the items, never taken on trust.
Barcodes are looked up in Open Food Facts, the crowd-sourced database, and credited as such in the app. If a code is not there, enter the figures from the label and it is yours from then on.
We read the whole sentence, not keywords. Before anything is worked out, your words go back on screen for you to check, because a misheard food is not a typo you notice later. It is the input to the calorie figure.
The recording is never kept. Not on the phone, not on the server.
“I had two scrambled eggs on sourdough toast with a flat white and a handful of blueberries.”
That’s what we heard. Estimate from it, or tap the microphone to say it again.
Today › a meal › Log leftovers
Open the meal, tap Log leftovers, and tell CoreFuel what stayed on the plate. The meal recounts to what you ate, and so does the day.
The day recounts itself
Tap how much of each meal you actually ate.
1,110/ 2,638 kcal
AS SERVED · 235 KCAL
AS SERVED · 565 KCAL
AS SERVED · 310 KCAL
Photograph
We compare it with the photo you logged when we can. When we can’t, we judge from the one photo, hold our confidence lower, and tell you so.
Say or type
“Left half the rice and most of the slaw.”
By hand
No AI at all.
You review every item before anything is saved, and the correction is reversible.
Plan › Meals
The Plan tab holds two weeks in one: what to eat, with its shopping list, and how to train. Both are written for you, and both log straight onto your day.
The questions
Cuisines you enjoy, meals a day, how many people you cook for. Allergens are planned around, and every recipe still reminds you to check the labels.
The week
From over 5,000 recipes, by arithmetic rather than a guess, then refined by a model as a chef would. Each recipe shows its time, its calories and macros a serving, and how to make it.
Swap or log
Let the plan pick another, or ask for something quicker or with more protein, and undo it if you change your mind. A planned meal goes on your day in one tap.
Shopping
Grouped by aisle, ticked off as you shop, shared as text, and still there with no signal.
Sunday
If you ate from this week’s plan, next week’s is written on Sunday evening. If you didn’t, it asks first.
Plan › Training
A week written around your goal and your equipment, and a session that logs every set and says why today’s weight is today’s weight.
You hit 10 on every set last time.
Last time (Tue 20 Oct): 77.2 lb × 10, 10, 10, 10
Setup
Full gym, free weights or bodyweight; thirty, forty-five or sixty minutes. A week is written around your goal, or one session for today is built instantly.
The session
The load and reps for each set, a rest countdown between them, and what is up next. Where the catalogue has one, an animated demo or a video shows how it’s done. Sets logged without a signal save when you’re back.
Progression
Hit the top of your reps on every set and the lift goes up next time; miss and it holds. The session says which, and shows what you did last time.
It hurt
Flag a lift and it starts about ten percent lighter next time. On a morning your readiness is low, CoreFuel offers a lighter day or one set fewer on each lift. Your call either way.
Trends › Body, or the weekly check-in
CoreFuel reads a front, side and back photo for an estimate of your body fat and where it sits, then suggests how much to cut and the targets to do it. Every result says how far off it could be.
Three photos
In fitted clothes, the phone propped about two metres away, on a self-timer. Take them from the Body card on Trends or with your weekly check-in.
The estimate
About two to three points either way from three photos, wider if you skip one, narrower when you add a photo of an InBody or DEXA printout. Lean mass follows from it, then where fat and muscle sit, a muscle map and posture.
The cut
A target, a pace of 0.5–0.75% of body weight a week, and the daily calories and protein, worked out from the estimate, not written by a model. Apply them to your targets in one tap, or undo. A goal to gain or to hold gets its own version.
At the foot of every resultAn estimate from photographs, not a diagnosis. Scales, scans and a clinician measure more precisely.
Today and Trends
Today counts what is left to eat, rings each macro against its target, lists what you logged and shows the day’s session. Trends puts the days together, and each week ends with a review that says what comes next.
Every finished week gets a review, and a short read of it in its own numbers.
The bars, the averages and next week’s target are arithmetic. The coach’s paragraph is written by a model from those figures, and the screen says so: “Coach text is written by AI from the week’s numbers.”
Sleep, heart-rate variability and resting heart rate against your own baseline. Each says where it was read from and which way it moved, and the full Readiness screen sits one tap behind it. On a low morning it can offer a lighter training session.
Weight with its trend line, energy against each day’s own target, and protein, by week, month, six months or year. Patterns show what went together in your own days, and once a week Today shows the strongest of them.
Every week has its review. Once there is enough to go on, it suggests next week’s calorie target and says how it got there, in your own numbers. Accept it or keep yours. The review of a finished week closes with Coach: a short read of it, written by a model from the week’s numbers, and labelled as such.
Each lift over the year, a point a session: your strongest set that day as an estimated one-rep max, so 80 kg for 8 and 85 kg for 5 sit on one line. An estimate to compare sessions by, not a weight to try.
Today’s weight, from any scale, typed on the Weight screen. Typing it again today replaces it, and Undo takes it back. It moves your trend and nothing else.
One number a week: your weight, and if you choose, the three photos for body analysis. It updates your trend and ends on next week’s target, to use from Monday or to keep.
Every number editable, its source beside it, and a live preview of what a goal change does before you choose it.
Pick it on the week strip and log into it exactly as you would log into today. Kilograms or pounds, light or dark — both are yours to set, and the app shows what switching units does to your own numbers.
Apple Health, read with permission. Read only for the types you allow, and you can refuse any of them. Weigh-ins from a smart scale reach CoreFuel even with the app closed. The only thing CoreFuel writes back is the weight you typed at check-in.
iPhone Duo
A folded Duo keeps a column down one side for its clock and camera. In the next update CoreFuel uses it: the tab bar, Back and the log button sit in that column, and your day gets the rest of the screen.
Coming in the next update. Real screens from that build, folded.
35,895kcal, for one poke bowl
Where the numbers come from
That was a real answer, once. The fix was not to scale a bad number, which invents data. Now any estimate above 1,000 kcal is refused and re-examined by a larger model, whether it came from a photo or a sentence, and every total is recomputed from its items.
Most of what you see in CoreFuel is arithmetic you can check. A model is used in ten places, where reading a plate or a photo, hearing a sentence, writing a menu or a training week, or summing up a week takes judgement, and nowhere else.
Mifflin–St Jeor for resting energy, a stated activity multiplier, a goal offset, clamped to a sane range. Protein from bodyweight. The equation is named on screen, with the 1990 paper and the IOM reference intakes linked.
Percentiles and z-scores against your own baseline, shrunk toward published priors, a weighted mean, threshold rules. Statistics, not a model.
What you logged against how your weight trend moved over four weeks, at 7,700 kcal per kilogram: an estimate of what you burn, and how sure it is. Your goal’s step comes off it — 500 kcal a day to lose. Until there are two weeks of logging and four weigh-ins, two check-ins decide instead. Either way you accept it or keep your own.
A solver chooses the week’s recipes from the catalogue to meet your calorie and protein targets, in under two seconds. A model only refines the menu afterwards. The shopping list is added up from the week.
A lift goes up only when every set hit the top of its reps last time — by a plate’s step snapped to the weights your equipment has, or a rep for a bodyweight lift. Otherwise it holds, and the session says why.
Epley’s formula, load × (1 + reps ÷ 30), on your strongest set each session, from sets of up to twelve reps with a load. An estimate to compare sessions by, not a weight to try.
From the estimate and your weight: fat mass, lean mass held, a pace of 0.5–0.75% of body weight a week, a deficit never above a quarter of what you burn or below 1,200 kcal a day, and protein at 1.8 g per kilogram.
Two kinds of your own days compared — training days and rest days, say. Counted, not written by a model, and they show what went together, not why.
No percentages on a photo log. The review says where to look instead: “Portions are the usual suspect, so nudge any that feel off.”
You › Privacy and data
Each permission names its limit on the screen that asks for it. This is the short version; the full summary is one page.
Voice is transcribed, then the audio is discarded. Not on the phone, not on the server.
Plate and body photos are uploaded and sent to OpenAI to be read, which does not train on them. Nothing is analysed on the device, and we do not say otherwise.
For members 18 and over, behind a consent screen. Withdraw in You → Privacy and data → Body photographs and every one is deleted.
Your meal plan, training week and weekly summary are written from your goals, preferences and figures. Your name and email are never sent.
Delete account is in the app, with no request form. It erases your meals, plans, workouts, check-ins, photos and the account itself.
Health data is read only for the types you allow. The only thing CoreFuel writes back is the weight you typed at check-in.
No password to hold, no email login, no guest mode.
Your profile and the most recent 1,000 records of each kind, plans and workouts included, as one file from inside the app.
CoreFuel Plus
Every new account starts with fourteen free days. It is CoreFuel’s own trial, so there is no card and nothing to enter. After that, CoreFuel Plus renews monthly, at the price shown in the App Store for your country.
There is no lite tier: one subscription, and everything is included — logging, the meal plan and its shopping list, training, body analysis, Trends and the weekly review.
Full access. Nothing to enter, nothing charged.
The trial ends. Subscribe in the app to keep going; the price is on the screen, in your currency. The app counts the days down for you.
Cancel in your Apple ID subscriptions at least 24 hours before renewal. You keep access to the end of the period.
Install CoreFuel, sign in with Apple, and let it fill your facts from Apple Health. Fourteen days free, nothing to enter.
