Stillcraft / Apps / Ember
Ember is a fasting timer that explains what your body is doing as the hours pass, cheers you on when the goal is reached and is there when hunger knocks. Streaks, levels, badges and weekly challenges keep the fire going. Most fasting apps lock their best parts behind a subscription. Here everything is free, with no ads and no account, and nothing leaves your phone.
Android 8.0+ · Free · No internet permission · English & Русский
The ring is split into eight coloured stages, from digestion and the fuel switch to fat burning, ketosis, autophagy, the growth-hormone rise and deep renewal. You see the stage you're in, the time to the next one and a short note for every hour.
12:12, 14:10, 16:8, 18:6, 20:4, one meal a day, 24, 36, 48 and 72 hours, or a length of your own. Set when the daily fast begins and Ember shows your eating window.
Every day you reach your goal keeps the fire going. Levels grow with the hours you fast, from Spark to Sun.
Badges for long fasts, streaks, total hours, weight, water, check-ins and hunger waves ridden out. A new challenge arrives every Monday: five good days, an early dinner, a longer fast.
Hunger comes in waves and passes in 15–20 minutes. A 15-minute timer with a breathing circle helps you ride it out, with ten quick things that help right now.
Hours fasted per week or month, a calendar of reached goals, stats and the full history. Edit any fast, add one you forgot or discard one started by mistake.
A weight chart with a goal and BMI, in kilograms or pounds, a daily water counter, and quick check-ins for hunger, energy and mood.
Short, honest reading: what breaks a fast, electrolytes, how to break a fast well, exercise, sleep, fasting for women, longer fasts and safety. Plus the eight stages explained.
A quiet live timer in the notification shade, alerts for the goal and each new stage, a nudge at your scheduled start with a Start now button, and a home-screen widget.
No account, no servers, no analytics, no ads and no internet permission. Fasts, weight, water and check-ins live on the phone, and a JSON backup stays with you.
Fasting isn't for everyone. Ember shares general information and is not medical advice. Talk to a doctor first if you're pregnant, under 18, have diabetes, an eating disorder or a chronic condition.
Light and dark themes, and English and Russian written natively, not machine-translated. The Russian texts are gender-neutral.
| From | Stage | What happens |
|---|---|---|
| 0 h | Digesting food | Your body is busy with your last meal |
| 4 h | Settling down | Blood sugar and insulin drift back to baseline |
| 8 h | Shifting gears | Glycogen runs lower and your body turns toward fat |
| 12 h | Fat burning | Fat becomes a main fuel |
| 16 h | Into ketosis | Ketones climb, and many people feel clear and steady |
| 24 h | Cellular cleanup | Autophagy is thought to increase |
| 48 h | Growth hormone | Growth hormone rises and insulin stays very low |
| 72 h | Deep renewal | Early research hints at deeper renewal. Go carefully |
On Xiaomi (MIUI / HyperOS), Huawei and some other phones, allow Autostart for Ember and remove battery limits so the timer notification and reminders arrive on time.
JDK 17+ (Android Studio's bundled JBR works) and the Android SDK.
git clone https://github.com/bigdevwhale/ember.git cd ember ./gradlew testDebugUnitTest # unit tests ./gradlew assembleDebug # debug APK ./gradlew installDebug -Pdemo # app.ember.demo with a made-up history
No. Every plan, stage, article, badge and challenge is unlocked for everyone, with no ads, no trial and no subscription.
No. No accounts, no servers, no analytics, and the app has no internet permission. Fasts, weight, water and check-ins live in a local database on the phone. Settings → Backup exports everything to a JSON file you keep.
Fasting isn't for everyone. Talk to a doctor first if you're pregnant or breastfeeding, under 18, have had an eating disorder, have diabetes or take medication that lowers blood sugar, or live with a chronic condition. Stop a fast whenever you feel faint or unwell. Ember shares general information and is not medical advice.
Fix the start or end time of any fast, add a past fast you forgot to log, or discard one started by mistake. Streaks and badges are counted from the history, so they follow your edits.
How many Saturdays you have left, and what you'll do with them.
The mindfulness multi-tool: breathing, Wim Hof, a bell, practices and a journal.
A strict focus timer that actually blocks distractions.
Don't drift apart from the people who matter.
Quit a habit, one day at a time.
Turn your days into a quest.
A quiet place for your mind.
Your city, hidden in mist. Walk to reveal it.
Letters to your future self. Sealed until the day comes.
Found a bug, missing a feature, or want it in your language? Tell us on GitHub.
Open an issue