Track Your Fasting.
Visualize Your Progress.

I'm Sarah, a designer from Austin who turned my intermittent fasting experiments into data art. 6 free tools to plan eating windows, analyze metabolism, and track fasting-trend-charts — no guesswork, just numbers.

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6 Professional Tools
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Sarah's 30-Day Fasting Consistency
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% of target fasting hours achieved

6 Professional Fasting Tools

Everything I wish I had when I started my fasting journey in 2023. Each tool solves a specific problem I ran into.

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Session Tracker
Log start and end times, track your fasting streaks, and see your consistency score. The tool I use every single day.
Try it free →
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Metabolic Analyzer
Estimate ketosis timing, autophagy windows, and metabolic-analyzer switching based on your body data.
Analyze now →
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Window Planner
Align your eating eating-window-planner with your sleep schedule, work hours, and workout times. Get a personalized protocol.
Plan your eating-window-planner →
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Trend Charts
Visualize your fasting patterns with interactive charts. Add sample data or load from your session history.
View fasting-trend-charts →
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Goal Planner
Set your fasting fasting-goal-planner, get milestone predictions, and see exactly when you'll hit your targets.
Set fasting-goal-planner →
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Export Report
Download your fasting history as CSV or formatted fasting-export-report. Share with your doctor or keep personal records.
Export data →

Latest from Sarah's Fasting Journal

Real experiments, real data, real mistakes. Follow along as I figure this out.

📚 Read All Articles →

Why Track Your Fasts?

Most people fail at fasting not because they can't do it, but because they don't know if they're actually doing it.

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Data Beats Guessing

I thought I was "pretty consistent" until I saw the numbers. I was only hitting my target 60% of the time. Brutal.

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Privacy First

Your data stays in your browser. No accounts, no servers, no tracking. I literally cannot access your fasting logs.

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Find What Works

16:8 vs 18:6? Carbs vs protein to break a fast? The only way to know is to track and compare.

Common Questions

The stuff I wondered about when I started — and what I learned through trial and error.

❓ What is intermittent fasting?

IF isn't a diet — it's an eating schedule. Instead of telling you what to eat, it tells you when to eat. The most popular format is 16:8.

❓ Is fasting safe?

Not for everyone. Talk to a doctor first if you're pregnant, have diabetes, take medications that require food, or have any serious medical condition.

❓ What can I drink during a fast?

Black coffee, plain tea, and water are generally fine. The debate starts when you add milk, cream, or sugar. I use a splash of oat milk and still see results.

❓ How long until I see results?

Mental clarity improved within a week for me. Weight changes took 3-4 weeks. Track for at least 30 days before judging. More FAQ →