Available on iOS

A timer made of
six phases
of biology.

Fagia follows your intermittent fast with the calm of knowing what happens inside you, hour by hour.

Download on theApp Store
iOS 16 or later · 7-day free trial, then $9.99/mo
━━ The problem

You fast — but blind.

You started fasting to feel better. But watching a timer climb tells you nothing, apps pressure you with streaks and guilt, and the scale won’t always cooperate. Doing it right shouldn’t take a leap of faith.

The clock explains nothing

You know how many hours you’ve logged — not what your body is doing with them.

Apps pressure, they don’t accompany

Badges, streaks and guilt-trip alerts. Borrowed motivation that fades in a week.

Fasting, food and weight, apart

Hours in one place, calories in another, weight in a third. You never see the whole picture.

━━ 01

Evidence-based

Every hour corresponds to a real metabolic shift, documented in scientific literature. No vague promises, no gamification.

━━ 02

Calm and focused

Sober typography. No distractions, no nagging notifications. Consistency matters more than intensity.

━━ 03

Private by default

Your data lives on your device. No accounts, no mandatory cloud, no telemetry. What happens inside you belongs to you.

━━ Six phases

What happens when you fast.

Your body doesn’t wait for the clock — every hour it changes fuel source. Fagia translates what happens inside you into clear evidence.

PHASE 01

Anabolic

0h ━ 4h · DIGESTION

Your body processes the last meal. Glucose and insulin are elevated; storage mode is active.

PHASE 02

Catabolic

4h ━ 12h · GLYCOGEN

Insulin drops. The liver releases stored glycogen as the main fuel source.

PHASE 03

Lipolysis

12h ━ 16h · FAT BURNING

Glycogen depleted. Your body turns to stored fatty acids as its primary fuel.

PHASE 04

Ketosis

16h ━ 24h · KETONE BODIES

The liver converts fatty acids into ketone bodies. Efficient fuel for the brain and muscle.

PHASE 05

Autophagy

24h ━ 48h · RENEWAL

Cells recycle damaged components. Deep intracellular repair and clean-up.

PHASE 06

Deep

48h ━ 72h · REGENERATION

Growth hormone rises. Stem cell activation and immune renewal.

━━ How Fagia helps

Your fasting, your calories and your weight. Together at last.

Fagia turns the timer into a reading of your biology and unites the three pieces that actually matter into one honest story.

WHEN

Fasting

Hour by hour, see which metabolic phase you’re in. The clock finally means something.

HOW MUCH

Calories

Photograph your plate and it knows what you ate — no endless lists. And whether it breaks your fast.

THE RESULT

Weight

Log your weight and watch the real trend, without obsession or judgment.

And a projection that combines your fasting rhythm and your calories to tell you, honestly, when you’ll reach your goal.

━━ Features

Everything Fagia does.

A complete timer, without the noise. Every feature exists to help you understand your fast, not to distract you.

Phase-aware timer

It doesn’t just count time: it tells you which metabolic phase you’re in at every moment, hour by hour.

Six phases explained

Each phase with its real biology: digestion, glycogen, lipolysis, ketosis, autophagy and deep fasting.

Five protocols

16:8, 18:6, 20:4, OMAD or weekly 5:2. Switch anytime without losing your progress.

Milestone alerts

A notification when you enter ketosis or autophagy. No nagging reminders.

Live Activity and widget

Your phase and time remaining on the Lock Screen and Dynamic Island, without opening the app.

Scheduled start

Set a time and the fast starts on its own. Snooze or adjust right from the notification.

Data and streaks

Averages, completed fasts and current streak over 7, 30 days or the whole year. No empty metrics.

Sensation diary

Note hunger, energy and mood during your fast. Over time you’ll see patterns the clock alone can’t show.

Apple Health and privacy

Your fasts stay on your iPhone and, if you want, in Apple Health. No accounts, no servers.

Photo calorie counting

Photograph your plate and an on-device model estimates calories and macros. No database searching.

Does it break the fast?

Before you consume something, check it: the app tells you if it breaks your fast or is safe — water, black coffee, tea.

Weight and projection

Log your weight and see a projection of when you’ll reach your goal, combining your fasting rhythm and your calories.

━━ Inside the app

Information, not distraction.

Five screens. Zero motivational notifications. The app works for you, not the other way around.

SIX PHASES

What’s happening inside

1
Anabolic
digestion · 0h – 4h
2
Catabolic
glycogen · 4h – 12h
3
Lipolysis
ACTIVE
fat burning · 12h – 16h
4
Ketosis
ketones · 16h – 24h
5
Autophagy
renewal · 24h – 48h
SCREEN 02

Phase list

Each phase with its time range and description. Tap any to dive deeper.

7 DAYS

Data

AVERAGE
15h 30m
COMPLETE
6/7
HOURS PER DAY
S
M
T
W
T
F
S
STREAK
12d
SCREEN 03

Data and streak

Averages, completed fasts, current streak. No empty metrics or aggressive gamification.

3 / 6
ACTIVE · HOUR 13.4

Lipolysis

12h – 16h · fat burning

Your body has emptied its immediate reserves. Insulin is at its lowest level of the day.

INSULIN
basal
FATTY ACIDS
released
BURNING
active
━ WHAT YOU MIGHT FEEL
Stable hunger
Mental clarity
Cold hands
SCREEN 04

Phase detail

Key data, expected sensations, and the next phase. Educates without alarming.

CALORIE COUNT

Eat

930
kcal
TODAY · 2 MEALS
870 kcal left
Chicken & quinoa bowl
610 kcal
Greek yogurt & blueberries
320 kcal
Apple Intelligence estimates nutrition
SCREEN 05

Eat and calories

Photograph your plate and the app estimates calories and macros — no database search.

━━ How it works

Start in three steps.

01

Choose your protocol

16:8, 18:6, 20:4, OMAD or weekly 5:2. Change it anytime.

02

Tap start when dinner ends

Fagia handles the timer. Your job: close out the last meal of the day.

03

Observe, hour by hour

Watch which phase you’re in and note how you feel. Patterns will emerge that the clock alone cannot show.

━━ Behind the app

“Intermittent fasting flips a metabolic switch that improves glucose regulation, increases stress resistance and promotes cellular longevity.”

Mark Mattson · NIH · New England Journal of Medicine, 2019
━━ Frequently asked

No fine print.

Why intermittent fasting and not a diet?

+

It’s not a diet: it’s a time-based eating pattern. Fagia doesn’t tell you what to eat; it helps you understand what happens in your body when you leave space between meals.

Where do I download it?

+

On the iPhone App Store. It runs on iOS 16 or later. Tap any download button on this page.

Will there be an Android version?

+

Android is on the roadmap but comes after iOS. We’re polishing the iPhone experience first.

How much does it cost?

+

Start with a 7-day free trial. After that, $9.99 per month or $59.99 per year (two months free). No ads, no hidden purchases. Cancel anytime.

Is my data uploaded anywhere?

+

No. Everything lives on your iPhone. You can optionally sync with Apple Health, but nothing goes to our servers.

What scientific sources is it based on?

+

Each phase description is based on peer-reviewed literature: Mattson MP (NEJM 2019), Anton SD (Obesity 2018), Longo VD (Cell Metabolism 2014). Full references inside the app.

━━ Download

Download it and start today.

Fagia is available on the App Store for iPhone. Start with a 7-day free trial; then $9.99/mo or $59.99/yr. Private and ad-free.

Download on theApp Store
iOS 16 or later · 7-day free trial, then $9.99/mo