Lose weight with an AI coach that knows you.
Fabi combines daily weight tracking, personalized diet guidance, and a conversational AI coach into one beautifully simple app.
Free · iOS 17+ · No account required
Features
Everything you need to reach your goal
Daily Weight Tracking
Log your weight with a precision ruler picker. See your streak, celebrate every loss with confetti, and never miss a day.
Personal AI Coach
Chat with an AI coach that knows your profile — your goals, diet, health history, and pace. Advice that's actually about you.
Progress Analytics
Weekly and monthly trend charts. Spot plateaus early, track your total loss, and understand the direction you're heading.
Calendar Heatmap
A full history of every logged day. Green for on-track, red for missed — instant visual accountability.
How it works
Simple by design
Complete your profile
Answer a short onboarding to set your starting weight, goal, diet type, and timeline. Fabi builds your coaching context from day one.
Log your weight daily
Open the app each morning and enter your weight. Takes five seconds. The streak counter keeps you coming back.
Talk to your AI coach
Ask anything! What to eat, why you plateaued, how to stay motivated. Your coach always has context about your journey.
FAQ
Common questions
Is my data stored on my device?
Yes. All weight entries and profile data are stored locally using SwiftData. Nothing is uploaded to external servers.
How does the AI coach work?
Fabi sends your profile summary (goals, weight, diet, health context) to GPT-4o mini via a secure proxy. Your chat history never leaves the conversation.
Can I use kg and lbs?
Yes. You can switch between kg and lbs at any time. All conversions happen automatically.
Is Fabi free?
Fabi is free to download. Some features like the AI coach require a subscription, manageable inside the app.
What iOS version do I need?
Fabi requires iOS 17 or later.
Start your journey today
Download Fabi for free and meet the AI coach built around your goals.