Track your intermittent fasts with elegance, biological precision, and zero clutter. Understand what happens in your body at every hour.
📲 Download on the App Store
Everything you need to master your fasting window, and nothing you don't.
Real-time biological timeline tracking when your body reaches Blood Sugar Reset, Glycogen Depletion, Fat Burning, Autophagy, and Deep Ketosis.
No accounts, no sign-in, and zero analytics tracking. Your health and fasting records stay strictly on your device.
Choose standard presets (16:8, 18:6, 20:4, OMAD) or adjust your target with an interactive 24-hour dial.
Glanceable monthly heatmap to celebrate consecutive daily milestones and build permanent wellness habits.
Engineered with deep midnight tones and radiant solar gradients that feel effortless to check morning and night.
Enjoy a clean, undisturbed fasting experience without popup advertisements or locked feature walls.
Solstice calculates your body's biological transitions in real time.
Insulin levels fall, digestion completes, and blood glucose stabilizes.
Liver stores are consumed as energy sources shift toward fat stores.
Fatty acids are broken down into ketones for clean mental and physical fuel.
Cellular cleanup initiates, recycling damaged proteins and organelles.
Growth hormone surges and systemic inflammation markers drop.
We build Solstice for the community. Let us know how we can make your fasting journey even better.