Fasting tracker
The simplest way to track your fasts, water intake, and weight.
Experience Fastinja
Everything you need, nothing you don't.
Tap a feature to dive into the details.
Precision Timing
Our beautiful circular timer gives you a high-resolution view of your fast. Track elapsed time, goal progress, and even see your water and mood logs directly on the clock ring.
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Your Journey, Visualized
Browse through every fast you've ever completed. See at a glance which goals you met and where you pushed your limits. Drill down into specific days to see detailed logs.
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Drink Better
Customize your drink types and sizes. Whether it's pure water, black coffee, or herbal tea, Fastinja helps you stay on top of your hydration goals without breaking your fast.
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Body Transformation
Log your weight in kg or lbs and see the trends over weeks, months, or years. Our charts help you stay motivated by focusing on the long-term progress, not daily fluctuations.
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Mind & Body
Fasting isn't just about the body. Track how you feel throughout your fast. Identify patterns in your mood and energy levels to find the fasting window that works best for you.
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Your Data, Safe
Export your entire history to a JSON file for backup or analysis. Move your data between devices with ease. Use our Demo seeder to see how the app looks with years of data.
Tap to flip backAn honest fasting tool. Five things we promise.
No onboarding, honest scope, zero tracking, no interruptions, and no subscriptions. Scroll through what that actually means — and why we built it this way.
Open the app. Tap start.
Fastinja greets you with a timer — ready to start.
- Skip the lengthy questionnaires.
- No profile setup required.
- Zero email verification.
- No signup necessary.
Your fast begins the moment you decide it does.
We don't ask about your age, gender, medical history, or past diets.
None of it is needed to track a fast, so we don't collect it.
We record only what helps you fast.
Two timestamps and three optional logs. That's the entire data model — nothing else is asked, recorded, or inferred.
- When your fast started
- When it ended
- Water intakeoptional
- Weightoptional
- How you feltoptional
Your data stays on your phone.
There is no Fastinja server collecting your fasts.
Your logs never leave your device — not to us, not to a partner, not to anyone.
No analytics SDK, no email list, no account.
You can securely back up your data to your own private storage and restore it on the same phone or a new one.
Uninstall the app and the data goes with it. There's nowhere else for it to go.
We won't interrupt your day.
No push notifications, no streak guilt, no badges chasing your attention. Streaks feel motivating until they feel like a second job.
Your commitment is the only motivation that matters — and it's already yours.
No subscription. No ads.
Fastinja is one small payment and yours for a lifetime.
No monthly subscription, no advertisements, no premium tier locked behind your progress, no upsell when you reach a milestone.
We built the tool we wanted to use ourselves.
It works for us — we think it'll work for you too.
Open the app. Tap start.
That's it.
Completely free. For a healthier you.
Your data is yours.
Fastinja is built with privacy at its core. We don't have servers, we don't track you, and we don't sell your data. Everything stays right on your device.