FastSloth: Fasting Tracker

Now with calorie tracking and a recipe book! Log meals, save favorite recipes, and enjoy a smoother FastSloth experience with UI improvements.

No account. No subscription. No data leaves your phone.

FastSloth is a private intermittent fasting tracker with fasting insights, calorie tracking, a personal recipe book, hydration and weight tracking, Home Screen widgets, and custom themes with a Theme Builder.

Start fasting in one tap.

NEW: CALORIE TRACKER & RECIPE BOOK

Track your daily calories alongside your fasting progress.

Log meals and foods throughout the day, see your calorie totals at a glance, and keep everything together in one simple place.

Save your favorite meals in your personal Recipe Book so you can quickly reuse recipes and keep track of what you eat.

THEMES & THEME BUILDER

Choose a built-in theme or create your own.

Customize colors and appearance with the Theme Builder and make FastSloth feel like yours.

FASTING MADE SIMPLE

Start with one tap.

Choose 16:8, 14:10, 18:6, 20:4, OMAD, or create a custom fasting schedule.

See estimated fasting stages as you progress, including fat burning, ketosis, and autophagy.

CALORIE TRACKING

Log your meals and track your daily calorie intake.

See how your nutrition fits alongside your fasting schedule, hydration, and weight progress.

RECIPE BOOK

Save and organize your favorite recipes directly in FastSloth.

Keep the meals you make most often close at hand and quickly reuse them when tracking what you eat.

HYDRATION

Log water in seconds, track daily progress, and set hydration reminders.

See your progress from the Home Screen with the hydration widget.

WEIGHT & INSIGHTS

Track your weight over time with simple charts that make trends easy to see.

SMART NOTIFICATIONS

• Fast start and end alerts
• Fasting stage notifications
• Water reminders

STREAKS & MILESTONES

Track completed fasts, build streaks, and unlock milestone badges.

HOME SCREEN WIDGETS

See your current fast, hydration progress, and streak without opening the app.

PRIVATE BY DESIGN

No account. No subscription.

Your fasting history, calorie logs, recipes, weight, hydration logs, and settings stay on your device.

FASTING PROTOCOLS

• 16:8
• 14:10
• 18:6
• 20:4
• 23:1 / OMAD
• Custom schedules

Private. Personal. Lightweight.

Download FastSloth and start fasting your way.