AI calorie & macro tracker · iPhone
Snap it.Log it.Lock in.
Snap a photo of your meal and Lock's AI breaks it into calories, protein, carbs and fat in seconds. Every meal fills the ring. Hit your goal and it locks.
- Overnight oats+420
- Chicken rice bowl+650
- Salmon poke+580
- Greek yogurt+250
How it works
Snap it. Logged.
- Analyzing…01
Snap
Photo, nutrition label or barcode. Point and shoot.
Chicken rice bowl
650 kcal
Protein38gCarbs82gFat17g02AI reads it
Calories, protein, carbs and fat, estimated in seconds. Edit anything.
- Chicken rice bowl650Logged03
Logged
It lands in your day and moves the ring. Drinks can count toward water too.
Features
Everything your day needs. Nothing it doesn’t.
Your day. One dial.
Calories left, macros, water and steps on one screen. No digging.
Packaged? Scan it.
Scan the barcode or the nutrition label for exact numbers. Barcode and manual logging are never limited.
Days that stack up.
A month of logging at a glance, plus an AI review that tells you what’s working and what isn’t.
Protein dips on weekends. Try a high-protein breakfast Sat & Sun.
Water, your way.
Set a daily water goal and add a glass in one tap. Steps and active energy sync from Apple Health.
Iced latte looks like a drink. Add 350 ml to today’s water?
App icons
Make it yours.
Four home-screen icons. Pick one in Settings › App Icon.
Open LockDefault
Ring
Sticker
Keyhole
Pricing
Free to start. Pro when you’re ready.
$0
No card needed.
- Unlimited AI scans your first week
- Then 8 AI scans / day
- 1 AI diet review / day
- Unlimited barcode & manual logging
- +5 scans for every friend you invite
- Challenges · up to 5 friends
Monthly or yearly
Price shown in the App Store.
- Unlimited AI scans
- Unlimited AI diet reviews
- Create & join challenges
- Unlimited friends
- Data export
- Weight chart
FAQ
Things people ask.
Lock’s AI estimates calories, protein, carbs and fat from your photo. Like any estimate it can be off, so every entry is editable. For packaged food, scan the barcode or nutrition label for exact numbers.
Yes. Your first week has unlimited AI scans. After that, the free plan includes 8 AI scans a day, one AI diet review a day, and unlimited barcode and manual logging. Every friend you invite adds 5 bonus scans. Pro removes the limits.
Only what you choose to share. Meal photos show up in Moments only when you post them.
Yes. Connect Apple Health and your steps and active energy sync automatically.
English, 简体中文, 繁體中文, 日本語 and 한국어.
Yes. You can delete your account and all of its data from Settings at any time.
Social
Lock in together.
Add friends, keep a check-in streak and climb the friends leaderboard. Start a streak or step challenge, and share meals in Moments when you want to.
Invite a friend, get 5 bonus AI scans.
Friends leaderboard