BiumFasting made light
Intermittent fasting starts with one timer.
Real-time fasting timers from 16:8 to fully custom, a fasting stage guide, all-in-one meal, workout, water and weight logging, and weekly/monthly insights — no signup, and all data stays on your device.
Tired of fasting apps like this?
You just want a timer, but they push a paid subscription first
You can't even start without creating an account
Fasting, meals, and weight end up scattered across several apps
Bium is signup-free, all-in-one, and light ✨
Everything fasting needs, in one app
Timer, logging, and insights — all included
Fasting timer
16:8, 12:12, 18:6, 20:4 presets plus fully custom windows. Watch your remaining fast with real-time progress.
Flexible start time
Forgot to start the timer? No problem. Adjust the start time freely even while a fast is in progress.
Fasting stage guide
Early fast → transition → early ketosis → ketosis → autophagy. See exactly which stage your body is in right now.
All-in-one logging
Log meals, workouts, water, and weight on a single calendar. Fasting and daily records live in one app.
Weekly & monthly insights
Total fasting hours, reflection stats, and a goal-weight graph. Seeing the trend makes consistency easy.
Reminders & home widget
Get notified when a fast starts or ends, and check your progress from a home screen widget without opening the app.
A dark design for emptier hours
From timer to logs and insights — see the real screens
Fasting timer with real-time progress
Stage guide from early fast to autophagy
Meals, workouts, water & weight in one place
Total hours, reflections & goal-weight graph
Three steps is all it takes
Pick a fasting plan
Choose 16:8, 12:12, 18:6, 20:4, or set your own custom window.
Start the timer
Hit start and watch real-time progress flow through the fasting stages.
Log and review
Record meals, workouts, water, and weight, then review weekly and monthly insights.
Frequently asked questions
What is intermittent fasting?
It's an eating pattern where you set fixed eating and fasting windows each day. The most popular is 16:8 — fast for 16 hours, eat within 8 — widely used for weight management and a steadier daily rhythm.
How does 16:8 work?
You fast for 16 hours a day and eat only within the remaining 8-hour window. For example, finish dinner at 8pm and eat again from noon the next day. Pick the 16:8 preset in Bium and the timer manages it for you.
Is it free?
Yes — Bium is a free app supported by ads. The fasting timer, logging, and insights are all available for free.
Where is my data stored?
There's no signup or login — your data is stored only on your device. You can export and restore it with file backup, so your records survive a phone change.
When does autophagy start?
It varies by person, but autophagy is generally considered to begin around 20 hours into a fast. Bium's stage guide shows where you are, from the early fast all the way to autophagy.