A Cal AI alternative for the meals you eat out.

Who each is for

Two apps that both start with a photo.

Cal AI’s site leads with “Track your calories with just a picture”. By its own account you snap a meal, your phone’s depth sensor helps estimate the volume, and the app gives calories, protein, carbs and fat. It also scans barcodes, lets you describe a meal in words, and connects to Apple Health on iPhone and Google Fit on Android. You sign in with Apple or Google and your data is stored in the cloud. On the App Store it sits in Health & Fitness, and its listing says food-scanning results need a subscription.

PlateDiary sits in Food & Drink. Its job is remembering meals out: one photo of the table becomes a cut-out save for every dish and drink, filed under the place and the people you ate with. Calories are an optional layer — off unless you turn them on — that puts one rough number on each dish and adds up the meals you saved.

Side by side

Cal AI and PlateDiary, feature by feature.

Honestly

When Cal AI is the better pick.

• You want to track everything you eat, including packaged food — barcode scanning is a big deal there, and PlateDiary doesn’t do it.
• You cook at home most of the time and want to describe meals in words.
• You want your numbers to flow into Apple Health or Google Fit.
• You want the app in a language other than English; Cal AI’s App Store listing names English plus 14 more.

And the other way

When PlateDiary fits better.

• Most of what you want counted is eaten out. Restaurants, cafés, hawker stalls and food trips are what PlateDiary is built around.
• The table is shared. One photo catches every plate, and you keep or edit the saves that were yours.
• You want a rough number, not a verdict. One “~” per dish, the same calm colour whatever the number, and an optional daily number that is off by default.
• You don’t want an account. Nothing to sign up for, and the diary lives on your phone.
• You want the memory too. Your usual at each place, who you were with, and a map of everywhere you’ve eaten — with Calories on or off.

Accuracy

Neither app sees the butter.

Every photo-based counter shares the same blind spot. In a preliminary 2026 NIH test, four photo apps — Cal AI among them — underestimated weighed meals by about 250–345 calories on average, mostly from fat. PlateDiary was not part of that test, and we don’t claim it does better; it shows a rough “~” number and tells you photo estimates usually run low. Read how accurate AI calorie counters are for the details.

Switching

Using both, or switching.

Plenty of people use an everyday tracker at home and something lighter for nights out. If you switch, there is nothing to import into PlateDiary: it starts from photos. Photos you already took can be brought in, up to 10 at a time, and they keep the place they were taken.

Weighing up more apps? See Cal AI vs MyFitnessPal and calorie tracking with no account.

In PlateDiary

A rough number for the dishes you save — only if you want one.

Sources

Where the facts come from