Adaptive nutrition programme
Meal plan in. Groceries out.
Fettle recalculates your macros from real weekly check-ins — then turns your meal plan into a one-tap grocery checkout. Not a diary you fill in. A system that adapts to you.
Weekly adaptive check-ins
Plan → checkout in one tap
Built in the UK
Why plans stall
Static trackers cause the plateau they can’t fix.
A calorie target set in week one is wrong by week six — the body it was calculated for no longer exists. So people do everything right, stall anyway, and blame themselves. The plateau isn’t a discipline failure. It’s a tooling failure.
1
Check in once a week — two minutes
2
The Engine reads your trend and picks a state
3
Your macros are recalculated to where your body is now
4
Your meal plan updates — and becomes your basket
ONE WEEK WITH FETTLE
Four screens. That’s the whole system.
1
Check in
Weight, steps, adherence. Two minutes, once a week.
2
The Engine reads your trend
Signal, not noise — it separates real change from water and glycogen.
3
Targets update
New macros, explained. You always see why they changed.
4
Plan becomes checkout
Your week's ingredients, ready to buy in one tap.
The Adaptive Engine
It doesn’t just count. It decides.
Every week the Engine places you in a state — holding, adjusting, protecting, or running a protocol like a diet break or mini-cut. Plateaus get broken. Bad data gets quarantined. Period weeks get protected, not punished.
Engine
HOLDING
Trend aligned.
Targets maintained.
ON TRACK
Engine
ADJUSTING
Trend usable.
Targets adjusted carefully.
SMALL UPDATE
Engine
STALLED
Plateau confirmed.
Plan escalated.
BREAKTHROUGH
Engine
DEFENSIVE
Cycle protected.
Targets held steady.
PROTECTIVE HOLD
Engine
DEFENSIVE
Diet break started. Targets eased for recovery.
RECOVERY PHASE
Engine
DEPLETING
Mini-cut started.
Short deficit active.
CUT PHASE
Engine
HOLDING
Trend aligned.
Targets maintained.
ON TRACK
Engine
ADJUSTING
Trend usable.
Targets adjusted carefully.
SMALL UPDATE
Engine
STALLED
Plateau confirmed.
Plan escalated.
BREAKTHROUGH
Engine
DEFENSIVE
Cycle protected.
Targets held steady.
PROTECTIVE HOLD
Engine
DEFENSIVE
Diet break started. Targets eased for recovery.
RECOVERY PHASE
Engine
DEPLETING
Mini-cut started.
Short deficit active.
CUT PHASE
Inside the app
Built to be used, not just admired.
Trend, not noise
Meals that fit your targets
Ingredient-level planning
Every change, explained
Activity in context
Cycle-aware planning
You, in control
Pricing
Try the adaptation. Then decide.
14 days free
£99.99
/year
Full Adaptive Engine — weekly recalculation, protocols and protective states
Meal planning + grocery basket via Morrisons on Amazon Fresh
No ads. No selling your data. You are the customer, not the product.
Your first 14 days are free — long enough for the Engine to make its first change to your targets. Assembling the same thing from separate apps costs more: an adaptive macro app plus a meal-plan-to-basket app comes to £146.98 a year between them, and neither one tells the other when your targets move. Comparison prices taken from the UK App Store, August 2026.
Questions
Fair questions, straight answers.
Is Fettle just another calorie tracker?
No. Trackers record what happened. Fettle plans what to eat, recalculates your targets from your weekly trend, and turns the plan into a grocery checkout.
How is this different from MacroFactor?
Do I have to log every meal?
What happens when I plateau?
What does it cost?
