Science-backed intermittent fasting and sole water challenges with an AI companion that lives entirely on your device.
Sally combines proven science with intelligent technology to make fasting safe, effective, and sustainable.
Start with beginner-friendly 12:12 and advance all the way to advanced 72-hour protocols at your own pace.
Structured mineral replenishment program with himalayan sole water to support electrolyte balance during fasting.
Your personal on-device AI coach powered by Apple Foundation Models. Answers questions, tracks progress, and keeps you motivated.
Every notification and recommendation is grounded in peer-reviewed research with full journal citations.
Configurable reminders with embedded medical citations so you always know the 'why' behind each prompt.
Full support for English, Spanish, and French — the app speaks your language.
Every feature in Sally is grounded in peer-reviewed research from leading journals and Nobel Prize-winning work.
Nature Cell Biology, 2016
“Fasting triggers cellular autophagy, a self-cleaning process that removes damaged proteins and organelles.”
— Yoshinori Ohsumi (Nobel Prize 2016)
Cell Metabolism, 2019
“Time-restricted eating improves metabolic parameters independent of caloric intake, including blood glucose and lipid profiles.”
— Satchidananda Panda et al.
Nature Reviews Neuroscience, 2018
“Intermittent fasting increases BDNF production, supporting neuroplasticity and cognitive resilience.”
— Mark Mattson et al.
Cell, 2019
“Extended fasting cycles reduce pro-inflammatory markers and reset immune cell populations.”
— Valter Longo et al.
Journal of Clinical Investigation, 2020
“Structured mineral supplementation during fasting prevents electrolyte depletion and supports cellular hydration.”
— Dieter Haussinger et al.
Science, 2017
“Aligning eating windows with circadian rhythms amplifies the metabolic benefits of time-restricted feeding.”
— Jeffrey Hall, Michael Rosbash, Michael Young (Nobel Prize 2017)
Sally is your personal AI fasting coach, built on Apple's on-device Foundation Models framework. She understands your goals, answers your questions, and keeps you on track — all without ever sending your data to the cloud.
Your conversations and health data never leave your device.
Powered by Apple Foundation Models for natural, contextual responses.
No internet required. Sally works offline, anytime.
Nine structured protocols take you from your first 12-hour fast to an advanced 72-hour cleanse, safely and progressively.
Free to download. Science-backed protocols. Your data, your device, always private.