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Open the app and tap the "Start Fast" button on the Timer screen. The timer will begin tracking your fast using your active schedule. You can monitor your progress through the metabolic stage ring.

No. You can start using Abstia right away — anonymously, with no email or sign-up. Your fasts, profile, and settings are saved on your device. Whenever you're ready, link a permanent account (email and password, Google, or Apple) from Profile to save your progress, sync it across your devices, and keep your data if you change or lose your phone. Linking keeps all of your existing data.

Yes! On the Timer screen, tap your active schedule to open Schedules, then tap "Create Custom Schedule." You can set any fasting duration and eating window that works for you, and it appears alongside the built-in presets like 16:8, 18:6, 20:4, 23:1 (OMAD), 36:12 (ADF), and 48:24.

Abstia tracks 8 biological stages of fasting: Absorptive Phase (0-2h), Post-Absorptive (2-4h), Insulin Dropping (4-8h), Fat Burning (8-12h), Ketosis Onset (12-18h), Ketosis Phase (18-24h), Autophagy Active (24-48h), and Deep Cellular Repair (48h+). These are based on general metabolic research and help you understand what's happening in your body.

The fasting coach analyzes your patterns — including streaks, mood trends, hunger types, and completion rates — to provide personalized tips. It recognizes when you're struggling or thriving and offers relevant advice. Tips are spaced out so they don't overwhelm you.

Yes, and it's optional. From Profile, connect Apple Health (iOS) or Health Connect (Android) to bring in your weight, calories, and macros so they appear alongside your fasts. The integration is read-only: data flows one way into Abstia, and the app never writes, changes, or deletes anything in Apple Health or Health Connect. You can disconnect anytime from Profile, or revoke access in your device's Health settings.

The Insights tab visualizes your trends: a fasting consistency calendar, weight over time, calorie balance against your estimated TDEE, and macronutrient breakdowns. The nutrition and weight charts populate from the health data you connect. These figures are estimates for informational purposes — not medical advice.

Yes. Native Apple Watch and Wear OS apps let you monitor your active fast from your wrist — your metabolic ring and time remaining — and you can add a watch-face complication for a quick glance. Starting and ending fasts is done from your phone.

Yes. Your data is securely isolated so only you can access your records. We don't sell your data and we don't show ads. Any health data you connect (Apple Health or Health Connect) is used only inside Abstia and is never sold or shared with our analytics provider. We use anonymized usage analytics to improve the app. See our Privacy Policy for full details.

Yes. Abstia stores your data locally on your device using SQLite. When you're back online, your data syncs automatically. You can start, track, and complete fasts without an internet connection.

Go to Profile > Appearance and choose System, Light, or Dark. System mode follows your device's display settings automatically.

Yes. Contact us at support@abstia.com and we will delete your account and all associated data within 30 days. We're working on adding in-app account deletion in a future update.

Abstia is free to download and use. We may introduce optional premium features in the future.