JejumJáYour fast, hour by hour, with the source for every claim.
From 16:8 to fasts of several days: JejumJá shows which stage of the fast you're in, logs water, electrolytes, ketones and weight, and works even without a connection.
No ads. Your health data only with your consent.
Everything a fast needs, in one app
Every stage and every number comes with its source. Tap ⓘ to see where it comes from.
Timer with stages
Goals from 12 hours to 7 days. The app shows the stage of your fast (blood sugar, metabolic switch, ketosis) with the scientific references.
Long fasts, with care
Over 24 hours only after you read a caution with sources. During the fast, a daily check-in asks how you feel.
Water and electrolytes
Log water in ml with one tap and note sodium, potassium or magnesium, right beside the timer.
Ketones and glucose
Blood meter readings and urine strips read by the chart on the pack. With glucose and ketones together, the app works out the GKI.
Weight and waist
A 7-day average and the change since your first entry. Bring in weight from your scale through Health Connect.
On your phone's screen
The timer sits in the notification bar and in a home-screen widget, with a button to end the fast.
Works offline
Started or ended a fast with no signal? The app keeps it on the phone with the right time and sends it later.
Fast with someone
Invite someone who cheers you on. They only see the milestones you choose to share.
Your data is yours
Export or delete everything from the app, any time. No ads, no selling data.
See the app
Before you start
Fasting may not suit people who have or had an eating disorder, are pregnant or breastfeeding, or are at high risk of bone loss and falls, and it can affect diabetes management (Mayo Clinic). If any of this applies to you, talk to a health professional before you start.
If you feel unwell, dizzy or confused, end the fast and get medical help.
Join the beta
JejumJá is in a free closed test on Google Play. To take part:
- Email contato@jejumja.com with the Google account email on your phone.
- We add you to the test and reply with the link.
- Open the link on your Android phone, accept the invite and install from Google Play.
Needs Android 8 or newer. There is no iPhone version yet.