16:8 fasting tracker
Fasting timers count down 16 hours and call it a day. They never tell you that your eating window was actually 10 hours, or that your late-night snack reset the clock. OutLast scores your 16:8 compliance daily — so you know if you’re actually doing the protocol or just thinking you are.
Free to use · No credit card · 2 sec to log
Also track: Sleep · Workouts · Cold Plunge · Supplements · Hydration · Caffeine
The problem
Fasting timers count down 16 hours but never measure whether your eating window actually stayed within 8 hours
Generic meal loggers track what you ate but don't score how well you stuck to your 16:8 protocol
Willpower alone leads to window creep — an extra snack here, a late bite there, and your 8-hour window becomes 10
OutLast scores your 16:8 compliance daily, tracks your actual eating window to the minute, and connects your fasting schedule to energy and mood
How it works
Tap, name the meal, done. OutLast timestamps every entry and calculates your exact eating window and fasting duration automatically. No timers to start or stop — your meals are the data.
Every day gets a compliance score based on fasting duration, eating window width, and consistency with your target. A tight 8-hour window scores high. A 10-hour drift gets called out.
Log how you feel alongside each meal. After two weeks, you’ll see exactly which eating windows, meal timings, and food choices give you peak energy on the 16:8 protocol.
What you get
OutLast natively understands the 16:8 schedule. Select the protocol and every day is scored on fasting duration, eating window width, and consistency. No manual configuration or workarounds needed.
See your actual eating window mapped across the day — first bite to last bite, down to the minute. Spot when you’re creeping past 8 hours before it becomes a habit.
Log how you feel with each meal in one tap. OutLast connects your eating window timing to energy levels, so you can discover whether an early window or late window works better for your body.
Build a streak of compliant 16:8 days. Your streak counter rewards consistency — not perfection. Miss a day and the data shows it, but one bad day doesn’t erase your progress.
The science
What people say
“I thought I was doing 16:8 for months. OutLast showed me my actual eating window was 10.5 hours. Once I saw the score, I tightened up immediately. Two weeks later I was consistently under 8 hours and the difference in how I feel is night and day.”
“Zero counted my fasting hours but never told me my eating window was too wide. OutLast scores the whole picture — fasting duration AND eating window. That’s the piece I was missing. My compliance score went from 65 to 91 in three weeks.”
“The energy tracking changed everything. I was eating from noon to 8 PM and dragging every afternoon. OutLast data showed that a 10 AM to 6 PM window gave me way better energy scores. Same protocol, different timing, completely different results.”
Questions
Every meal is a data point. Every eating window gets a score. OutLast shows you whether your 16:8 is actually 16:8 — and what it’s doing for your body.
Free to use. One-tap logging. Built for the 16:8 protocol.
Start scoring my 16:8Free to use · No credit card · Takes 2 seconds