Plans compared
What the subscription includes, and what the AI Add-On adds
LyteFast is free to download, and using it needs a subscription. On top of it, an optional AI Add-On unlocks the features that send a photo or a description to an AI model. Here is exactly where the line falls in LyteFast 1.6, so you can decide whether you need the add-on.
The subscription: everything you need to follow your trend
The subscription is the app itself. It comes as a weekly, monthly or yearly plan, and eligible new subscribers start with a 3-day free trial on the weekly plan. It includes the weight forecast — the Milestones chart smooths your weigh-ins into a trend and gives the date you should reach each milestone, zoomable from 15 days to a year — and the daily view of what drives that trend: calories against your budget, protein, activity, the caloric deficit and your BMI.
Weigh-ins from a smart scale and the active energy from your Apple Watch or another tracker arrive through Apple Health; without one, you add a weigh-in or one of 37 activity types by hand. For food without a camera, Add Food lists 111 common foods with their calories, a carbon footprint level, gluten status, glycemic index and a weight-loss score from 0 to 100.
The subscription includes
- Weight forecast and milestones
- Calorie budget, protein, caloric deficit and BMI
- Fasting timer, with any window from 1 to 240 hours, and its history
- Apple Health sync and the list of 111 everyday foods
- Body Preview: an artistic preview of yourself at your goal weight, up to 10 a week
- Adherence, share cards and your daily streak
- The Apple Watch app and its two complications (new in version 1.6)
The AI Add-On: food and body analysis by AI
The AI Add-On is a separate weekly, monthly or yearly plan that works on top of the subscription, not instead of it. It covers the features that need an AI model to read a photo or a description: the AI food scan, from a photo or from a few typed words, which estimates calories, protein, carbs and fat, a carbon footprint and the gluten status and tells you whether the meal fits your budget; the barcode scanner, which looks a product up in Open Food Facts and then in the USDA database; AI Muscle Rating, which scores eight muscle groups from 1 to 100 and gives a rank from Wood to Olympian; and the eight-week Summer Plan.
The AI Add-On adds
- AI food scan from a photo or text (up to 25 photo scans and 100 text entries a day)
- Barcode scanner (up to 100 scans a day)
- AI Muscle Rating (up to 5 a day)
- Summer Plan, the eight-week Summer Body Program
AI estimates can be wrong: check a food scan before you accept it. Muscle Rating scores and Body Preview images are for motivation; they are not body-composition measurements or predictions of how you will look.
Which one fits you
If you log your weigh-ins and meals yourself and want to know whether it is working and when you will reach your goal, the subscription is the whole app you need. If typing in food is what stops you logging, the AI Add-On's scanners are aimed squarely at that.
Billing, trial and cancelling
Apple sells and bills both plans. Prices in your currency are shown in the App Store and in the app before you buy. Plans renew automatically unless you cancel at least 24 hours before the end of the current period, in your Apple Account settings (Settings, your name, Subscriptions). On a new device, Restore Purchases on LyteFast's subscription screen brings your plans back. LyteFast has no ads and no account.
LyteFast needs iOS 18.0 or later; the Apple Watch app needs watchOS 11 or later and LyteFast on a paired iPhone. In the app you can choose from more than 90 languages.
All features and insights are estimates for informational purposes and do not replace medical, nutritional or fitness advice.
Updated on 19 October 2026 for LyteFast 1.6. An earlier version of this page described a free tier; the app requires a subscription, with a 3-day free trial for eligible new subscribers.