Luca vs Cal AI

Pick Cal AI if you use Android or an Apple Watch, want to search a database of over 1 million foods, or also want to track water, exercise, weight and measurements in the same app. Pick Luca if you want photo logging on an iPhone with no sign-in, one free AI scan a day, and friends who never see your meals or numbers.

Last checked: October 5, 2026

Luca and Cal AI side by side

Cal AI describes itself as an AI-powered app for easy calorie tracking: snap a photo, scan a barcode or describe your meal to get calorie and nutrient info.

Facts about Cal AI come from its own pages, listed under Sources, and were checked on October 5, 2026. They may have changed since. Luca is not released yet.
Topic	Luca	Cal AI
Price of the paid plan	Luca Pro: $6.99 weekly, $9.99 monthly or $49.99 yearly (US prices), billed through Apple	Price shown in the app, not on the website. The App Store listing shows in-app purchases named "Unlimited" from $2.99 to $29.99, without billing periods^[2]
Free plan	1 AI scan a day. Barcode and manual entry are unlimited	The App Store listing says food scanning analysis results require a subscription. The website advertises a 3-day free trial^[2]
Platforms	iPhone only (iOS 17 or later). No Android, web app, iPad or Apple Watch app	iPhone (iOS 18 or higher) and Android 10 or higher. The App Store listing also shows Apple Watch^[3]
Account needed	No account, no sign-up, no email. The app uses an anonymous identifier	Yes. The FAQ tells you to sign in with a Google account or Apple ID, and says your data is stored in the cloud under that account^[3]
Ways to log	Photo, voice, typed description, barcode	Photo, barcode, a description of the meal, or a search of its food database^[1]
Who processes meal photos	Photos go to the developer's own servers for analysis, not a third-party AI provider, and are not stored on the server	The privacy notice lists food submitted by voice and image logging among the data it collects. Who processes the photos: not stated on the pages we checked^[4]
Food data source	Calculated from a nutrition database where the food is recognised; label data for barcodes. Photo results are still estimates	A database of over 1 million foods, searchable by name, brand or barcode. Where the data comes from: not stated on the pages we checked^[1]
What friends can see	Display name, avatar, streak, whether you logged today, whether you met your goal today, and badges. Never calories, macros, meals or photos	The privacy notice says content posted in public and private groups can include your name, diary entries, photos, fitness goals and achievements^[4]
Apple Health	Works with Apple Health (optional)	Connects with Apple Health on iPhone and Google Fit on Android^[3]
Home Screen and Lock Screen widgets	Yes, both	Not stated on the pages we checked
Recipes, water, weight and exercise	No recipes, water, weight or exercise tracking, meal plans or coaching	Weight and measurements, water intake, daily exercise, and your own foods and recipes^[1]

Cal AI and Luca are the two closest products in this set of comparisons. Both are built around a camera: you photograph a meal and get an estimate of calories and macros. The differences are in platforms, sign-in, the free plan and what other people can see.

Where Cal AI is the better choice

Android and Apple Watch. Cal AI’s FAQ lists iPhone and Android, and its App Store listing shows Apple Watch. Luca is iPhone only.
A searchable food database. Cal AI’s website describes a database of over 1 million foods that you can search by name or brand. Luca makes no claim about a database size.
More to track. The website lists weight, measurements, water intake and daily exercise, plus your own foods and recipes. Luca tracks calories, protein, carbs and fat only.
Groups. Cal AI’s privacy notice describes a Groups feature with public and private groups. Luca has friends and friend challenges, with no public groups or forums.
Data follows your sign-in. The FAQ says your data is stored in the cloud and comes back when you sign in with the same account on a new phone.

If you are on Android, or you want water and exercise next to your meals, Cal AI is the better fit.

Where Luca is different

No sign-in. There is no account, no sign-up and no email. The app uses an anonymous identifier.
One free AI scan every day. Barcode and manual entry are unlimited on the free plan. Luca Pro removes the scan limit: see pricing.
Where the photo goes. Photos are sent for analysis to servers the developer runs, not to a third-party AI provider, and are not stored on the server. Meal text is not stored either. Meals live on the device, and in your iCloud if you have it enabled. Details are on the privacy page.
Friends see very little. A friend, added by a 4-character code, sees your display name, avatar, streak, whether you logged today, whether you met your goal and your badges. Never calories, macros, meals or photos. See logging with a friend.
Four ways to log. Photo, voice, a typed description or a barcode.
Widgets. Home Screen and Lock Screen widgets.

What neither can promise

Both apps estimate. A camera cannot see oil in a pan, the weight of a portion or what is under a sauce. Cal AI’s own FAQ says “No food tracking app is perfect, and calories and nutrition values can vary”, and suggests good lighting and a clear, in-focus photo. The same advice applies to Luca: treat the result as a starting point, then edit the items and numbers. There is more on this in how photo calorie estimation works.

Neither app is a medical device. Cal AI’s App Store listing says it does not offer medical advice, and Luca does not either. Targets and numbers are general information, not a plan made for you.

Checked on 5 October 2026 against the Cal AI pages listed under sources. Prices and features change, so confirm them on Cal AI’s own site. Product names and trademarks belong to their respective owners.

Sources

Last checked on October 5, 2026. Cal AI and other product names are trademarks of their owners. Luca is not affiliated with them. Found a mistake? Tell us and it will be fixed.

Questions

Is Luca a Cal AI alternative?

For iPhone, yes in the core job: both turn a meal photo into an estimate of calories, protein, carbs and fat, and both read barcodes. Luca does not replace Cal AI on Android or Apple Watch, and it has no water, exercise, weight or measurement tracking.

Is there a free version of Luca or Cal AI?

Luca's free plan includes one AI scan a day, with unlimited barcode and manual entry. Cal AI's App Store listing says food scanning analysis results require a subscription, and its website advertises a 3-day free trial, as checked on 5 October 2026.

How much does Cal AI cost compared with Luca?

Cal AI's website shows no price. Its App Store listing shows in-app purchases named Unlimited from $2.99 to $29.99 without billing periods, as checked on 5 October 2026. Luca Pro is $6.99 weekly, $9.99 monthly or $49.99 yearly in the US.

Do I need to sign in to use Luca or Cal AI?

Cal AI's FAQ tells you to sign in with a Google account or Apple ID and says your data is stored in the cloud under that account. Luca has no account, no sign-up and no email. It uses an anonymous identifier and keeps meals on the device.

See what Luca does, and what it does not

Features · Limits · How it works

Coming to the App Store