Intermittent fasting app: a timer for 16:8, 18:6 and 20:4

Intermittent fasting timer for 16:8, 18:6 and 20:4: start from your last meal, see when it ends, track your average length – free, no banner ads.

Pick 16:8, 18:6 or 20:4 and start from your last meal – the ring shows how long is left.

At a glance

• Start 16:8, 18:6 or 20:4 in one tap – on Today, under “Body”
• Start from your last meal in the Food Diary, now, or another time up to 24 hours back
• A ring with the time you’ve fasted, plus how long is left and when it ends
• In the iPhone app, a notification when you reach your goal – if it ends between 21:00 and 8:00, it comes at 8:00
• This week: fasts, completed, average length and your longest fast
• History: average length over 7 and 30 days, fasts per week, every fast editable
• If you’re under 18 or your BMI is under 18.5, the app doesn’t suggest fasting

How it works

1. Pick a schedule – 16:8, 18:6 or 20:4 – from your last meal, now or another time.
2. Watch the ring – How long you’ve fasted, how long is left and when it ends.
3. Done – A notification in the iPhone app – and your history, week by week.

After your meal. One tap starts it.

• Start from your last Food Diary entry, now or another time up to 24 hours back
• The schedule you used last is preselected
• A notification in the iPhone app when you’re done – between 21:00 and 8:00 it comes at 8:00
• Turn it off in Settings under Notifications; in the browser there’s no notification

This week. At a glance.

• Fasts, completed, average length and your longest fast – in the fasting sheet
• On Today, under “Body”, a small ring shows how long is left and when it ends

Your history. Week by week.

• Average length over the last 7 and 30 days
• Fasts per week for the last 8 weeks, every fast of the last 12 weeks
• Change the start, end or schedule of a fast – or delete it

Intermittent fasting explained

Who the app doesn’t suggest fasting to

• SmarTasty is for ages 16 and up
• If your profile says you’re under 18 or your BMI is under 18.5, Today shows no row to start, and the fasting sheet says we don’t recommend fasting
• Fasting isn’t for you if you’re pregnant, breastfeeding or have an eating disorder
• If you have a medical condition or take medication, talk to your doctor first

Recipes for your eating window

• Meals for your eating window, with nutrition per serving

Intermittent fasting recipes

Frequently asked questions

Is there a free intermittent fasting app?

Yes. In SmarTasty you start 16:8, 18:6 or 20:4 in one tap, see in the ring how long is left and find every fast in your history. It’s free and has no banner ads – all you need is a free account.

Can I choose 16:8, 18:6 or 20:4?

Yes, those are the app’s three schedules: 16, 18 or 20 hours of fasting. The one you used last is preselected.

Does the app tell me when my fast is over?

Yes. The iPhone app sends a notification when you reach your goal. If the fast ends between 21:00 and 8:00, the notification comes at 8:00. In the browser you see the end time in the fasting sheet, but there’s no notification.

Can I change the start time afterwards?

Yes. When you start, choose “Since your last meal”, “Now” or another time up to 24 hours back. While the fast is running, change the start time in the fasting sheet. Change or delete finished fasts in your history.

Is intermittent fasting for everyone?

No. If you’re under 18 or your BMI is under 18.5, SmarTasty doesn’t suggest fasting. Fasting isn’t for you if you’re pregnant, breastfeeding or have an eating disorder. If you have a medical condition or take medication, talk to your doctor first.

SmarTasty on the App Store – or use it right in your browser: the SmarTasty app.