Intermittent fasting tracker
Fasting apps count down hours. They never ask how you actually feel. OutLast tracks when you eat AND how your body responds — so you know which fasting days give you energy and which ones wreck you.
Free to use · No credit card · 2 sec to log
Also track: Sleep · Workouts · Cold Plunge · Supplements · Hydration · Breathwork
The problem
Fasting timers track hours but never connect timing to energy, mood, or sleep quality
Calorie counters obsess over macros while ignoring the single biggest lever — when you eat
Meal journals take 5 minutes per entry, so you quit after a week
OutLast logs meals in one tap, calculates your fasting window automatically, and connects your eating schedule to how you actually feel
How it works
Tap, name the meal, done. OutLast timestamps every entry and calculates your fasting duration and eating window automatically. No barcodes. No calorie math.
Every day gets a score based on fasting duration, eating window consistency, and time of last meal. You'll know instantly if you're dialed in or drifting.
Log how you feel alongside each meal. After two weeks, you'll see exactly which protocols, eating windows, and meal timings give you the best days.
What you get
16:8, 18:6, 20:4, OMAD, circadian rhythm fasting, 5:2, and more. Pick one or let OutLast suggest a protocol based on your patterns.
Every day is graded on protocol compliance, eating window consistency, and timing of your last meal. No guesswork — just a number that tells you how you're doing.
Log how you feel with each meal in one tap. OutLast correlates your fasting schedule with energy levels so you can see which days actually work.
See your eating window mapped across the day. Spot when you're creeping later, breaking early, or nailing your target window consistently.
The science
What people say
“I used Zero for a year and never learned anything. Two weeks with OutLast and I realized my 18:6 days wreck my energy but 16:8 with an early window is perfect. The difference was meal timing, not fasting length.”
“The daily score is addictive in the best way. I went from randomly skipping breakfast to consistently hitting my eating window. Down 12 lbs in 3 months and I actually have more energy, not less.”
“I tried OMAD because a podcast told me to. OutLast showed me my energy and mood tanked every OMAD day. Switched to 16:8 and my scores went up across the board. Data over dogma.”
Questions
Your next meal is data. Your eating window is a lever. OutLast shows you exactly how to pull it.
Free to use. One-tap logging. No calorie counting.
Start tracking my fastsFree to use · No credit card · Takes 2 seconds