Learn From Your History
See trends and patterns across your fasts in one clean view.
Now on the App Store
Master your fast.
Start quickly, stay consistent, and understand your progress without turning fasting into guesswork.
Why Fastology
Fasting should feel clear.
Fastology helps you start quickly, track progress, and understand what keeps you consistent.
- Start
Start Instantly
No signup. No friction. Just open the app and begin.
- Progress
Track Real Progress
See momentum, milestones, and trends as your fast unfolds.
- Insights
See What’s Working
Insights that help you adjust and stay consistent.
Beyond the timer Review Schedule Ask
Clarity in every fast.
Review your progress, plan your week, and get research-backed context with Ask.
Adapts to Your Life
Set fasting windows around your actual routine.
Clarity on Demand
Research-backed content. Built for the Apple Intelligence experience.
Common questions
How do I get Fastology?
Tap the App Store button to download Fastology free on your iPhone.
Do I need an account to get started?
No. You can start using Fastology right away. If you decide to create an account later, you can unlock syncing and backup.
What devices does Fastology support?
Fastology is built for iPhone, with an Apple Watch companion app included as part of the experience.
Does Fastology work with Apple Watch?
Yes. The Apple Watch companion makes it easy to check your progress without pulling out your phone.
How does Fastology handle privacy?
Fastology is designed to be privacy-conscious. You can read more about how data is handled in the Privacy Policy.
Is Fastology medical advice?
No. Fastology is a wellness app for tracking, learning, and staying consistent. It does not replace medical guidance.
Start your next fast with Fastology