Mindful intermittent fasting.

fast—ing is your calm companion for fasting. No statistics, no analysis, no pressure. Just you, your body, and the present moment.

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fast—ing App on a Smartphone

As simple as a stopwatch.

fast—ing is intentionally minimal. No analysis, no gamification – just what really helps.

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One tap, one start

Start your fasting window with a single tap – and end it just as calmly.

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Phases at a glance

See which phase your body is in – from insulin to autophagy.

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No judgment

No statistics, no streak pressure. The app doesn't judge – you decide.

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Home Screen Widget

Keep track of your fasting status at all times – right on your home screen.

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Private. Period.

No accounts, no tracking, no data in the cloud. Everything stays with you.

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Built with care

An app that is considerate – of your body and your relationship with food.

The phases of your fast.

During fasting, your body goes through different stages. The times are guidelines – every body is different.

after about 4 hours

Insulin

Your insulin levels start to drop. Your body prepares for fat metabolism.

after about 8 hours

Blood Sugar

Your blood sugar stabilizes, your body takes a well-deserved break.

after about 10 hours

Fat Burning

Your body has flipped the switch and draws energy from fat reserves.

after about 12 hours

Ketosis

Your body switches energy sources and uses ketones instead of glucose.

after about 14 hours

Autophagy

A biological spring cleaning: old cells are broken down and renewed.

after 16 and 23 hours

Deep Autophagy

Your body is in intensive recycling mode, renewing itself from within.

What fast—ing is – and what it isn't.

The app is essentially a stopwatch for your fasting window. It doesn't save statistics, doesn't analyze anything, and doesn't judge.

Every body is different. The phases and times shown are guidelines – not a promise, not a standard. When your body transitions from one phase to the next depends on many factors.

Intermittent fasting is not suitable for everyone, and that's perfectly fine. It's always okay to not fast today or to stop. Listen to your body and to yourself.

This app is not medical advice and does not replace a healthcare professional. If you feel you have a difficult relationship with food or are suffering from an eating disorder, please take care of yourself and avoid using this app. Your health comes first.