Burn Index is a local-first fasting tracker designed to make your progress easy to understand without requiring an account.

Follow your fast with a precise live timer, configurable fasting goals, approximate metabolic stages, and private energy-use estimates calculated directly on your device.

FASTING TOOLS

• Start a new fast or enter one already in progress
• Set the start date and time or manually enter elapsed hours and minutes
• Change your fasting goal while a fast is active
• View approximate fasting stages with estimated hour ranges
• Receive optional stage and fasting-goal notifications
• Review completed fasts and fasting history
• Edit the starting time of an active fast

THE BURN INDEX METER

The Burn Index meter estimates energy used during your fast based on your locally stored profile and elapsed fasting time.

Its full-scale marker represents a configurable weight-energy equivalent. The default is the conventional energy equivalent of 1 lb, approximately 3,500 kcal. This does not mean that the app has measured 1 lb of body fat loss or a 1 lb change in body weight.

The meter does not measure metabolism, fat burned, glucose, insulin, glycogen, ketones, or any other biomarker.

PERSONALIZED DISPLAY

• Imperial or metric measurements
• Weight displayed in pounds, kilograms, or stone
• Configurable full-scale energy equivalent
• System appearance or instrument-style dark theme
• Estimates based on the Mifflin-St Jeor resting-energy equation

LOCAL-FIRST PRIVACY

Your age, height, weight, optional biological sex, settings, active fast, and fasting history are stored locally on your device. Burn Index does not require an account or send this profile and fasting information to a Chipboard server or to Google Mobile Ads.

Burn Index contains one dismissible banner advertisement. Google Mobile Ads may process limited device, interaction, diagnostic, identifier, and approximate-location information for advertising, analytics, and fraud prevention. Consent and privacy controls are provided where required.

Privacy policy:
https://chipboard.github.io/burn-index/privacy/

IMPORTANT HEALTH NOTICE

Fasting stages and energy values shown by Burn Index are approximate educational estimates. Individual physiology varies, and the estimates should not be interpreted as medical measurements or guaranteed outcomes.

Burn Index is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. Consult a doctor or other qualified healthcare professional for medical advice, diagnosis, or treatment and before fasting if you have a health condition, take medication, are pregnant or breastfeeding, have a history of eating disorders, or are uncertain whether fasting is appropriate for you.