Track your fast.
Hit your window. Every day.
Pacali's built-in fasting timer shows your fasting progress live, notifies you when your eating window opens, and tracks your history \u2014 all free. Combine it with AI calorie tracking for a complete picture.
Supports all major fasting protocols
Choose a preset or set a fully custom fasting window. Pacali adapts to how you fast.
16:8
Fast for 16 hours, eat within an 8-hour window. The most popular fasting protocol for weight loss and metabolic health.
18:6
Fast for 18 hours, eat within a 6-hour window. A step up from 16:8, typically used after adaptation.
20:4
Fast for 20 hours, eat within a 4-hour window (the "Warrior Diet"). Suitable for experienced fasters.
OMAD
One Meal A Day — a 23:1 fast. Eat one large meal per day within a 1-hour eating window.
Custom
Set any fasting and eating window you want. Pacali adapts to your schedule.
5:2 Diet
Eat normally 5 days a week and restrict to 500 calories on 2 non-consecutive days.
Everything you need to fast consistently
Live countdown timer
See exactly how long remains in your fast and when your eating window opens — updated in real time.
Fasting history
Track every completed fast. See your streaks, average fast length, and which days you stuck to your window.
Smart notifications
Get notified when your eating window opens, when it closes, and 30 minutes before it ends so you can plan your meal.
Pairs with calorie tracking
Combine fasting with Pacali's AI calorie and macro tracking. Log your meals during your eating window with a photo — done in 3 seconds.
No setup required
Select your protocol and start your fast. The timer runs in the background even when the app is closed.
Free, no subscription
The fasting timer is included in Pacali’s free plan. No Premium required.
Intermittent Fasting FAQ
- What is the best intermittent fasting protocol for beginners?
- 16:8 is the standard starting point. Skip breakfast, eat between noon and 8 PM. It fits naturally into most schedules and is well-supported by research for weight loss and metabolic health.
- Does Pacali track what I eat during my eating window?
- Yes. Pacali combines fasting tracking with full calorie and macro tracking. Snap a photo of your meal during your eating window and Pacali's AI logs it in under 3 seconds.
- Can I customize my fasting window?
- Yes. Enter any start time and window duration. Pacali will track your fast accordingly.
- Does the fasting timer work when the app is closed?
- Yes. The timer runs as a background notification so you always know your fasting status without opening the app.
- Is intermittent fasting safe?
- For most healthy adults, intermittent fasting is safe and well-studied. If you have a medical condition, diabetes, are pregnant, or have a history of eating disorders, consult a healthcare provider before starting any fasting protocol. Pacali does not provide medical advice.
Start your first fast today \u2014 free
Download Pacali. Select your fasting protocol and start the timer. Combine with AI calorie tracking for the full picture.