FastLumi

100% free · No account · No paywall · Your data stays on your phone

This week

Fast for hours
Ready when you are
16:00
Tap start to begin your fast

Resting while you eat.

Set when you actually began — earlier or later than the tap:

This changes the goal for this fast. Your fast keeps running.

Fast for hours

Water today 💧

One glass is about 250 ml. Sip steadily through the day — especially while fasting.

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Daily goal 8 glasses

Challenges

Small personal challenges — just you against the goal. Always free, like everything here.

Your journey

Chapter 1 of 4

Today's word

A short thought for the day. New every day.

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Day streak
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Longest streak
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Fasts
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Goals met
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Total hours
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Fast days
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Longest fast
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Weight change

This week

Your healthy range

Worked out from your height and latest weight — a guide, not a verdict.

Your BMI

Worked out from your latest weight and the height saved under Me → Settings.

Guest
Using FastLumi on this device — no account needed.

Account & sync

Optional: create a free account to back up your fasts and sync them across your devices. No account is needed to use the timer.

Your password is stored only as a salted hash. How FastLumi handles your data

Achievements

Streak goal

Pick a streak to aim for.

Settings

Units, your height (for BMI), and reminders. Changes apply instantly and sync with your account.

Remind me when my fast ends
Halfway encouragement
Water reminders while fasting
Window closing reminder
My plan

Reminders work while the app is installed on your phone. No account, nothing leaves your device.

No ads. No premium tier. Free.