FastSloth: Fasting Tracker

New themes are here. Choose a look you love or build your own with the new Theme Builder. FastSloth stays private, simple, and subscription-free.

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

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

Start fasting in one tap.

NEW: THEMES & THEME BUILDER

Choose a built-in theme or create your own.

Customize colors and appearance with the new 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.

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, 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.