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A SnapCalorie alternative for the whole table.

SnapCalorie is about measuring one meal as precisely as a phone can. PlateDiary is about the whole table — every dish, the place, the people — with a number that admits it is rough. Both are honest aims. Here is how to pick.

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In short

SnapCalorie is a photo calorie tracker from ex-Google AI researchers that measures portions, using depth sensors on supported iPhones. PlateDiary is an alternative for shared restaurant tables: one photo cuts out every dish, and each gets one rough calorie number you accept or correct, with no account. It has no barcode, exercise or weight.

Checked

SnapCalorie

SnapCalorie, in its own words.

SnapCalorie’s headline is “Track Calories in Seconds with AI.” Its App Store listing says it was founded by ex-Google AI researchers who co-founded Google Lens and Cloud Vision API, and that on supported iPhones it uses depth sensors to measure food volume. You can also dictate a meal as a voice note, or photograph a packaging label.

It says its data comes from the USDA database, that it works with home-cooked meals, restaurant dishes and meal prep, and that it syncs with Apple HealthKit. On accuracy it aims high: it claims to beat trained human estimators, “backed by peer-reviewed research on thousands of measured dishes.” It is on iPhone and Android.

Plate or table?

One plate, or the whole table?

Korean barbecue in Sydney with Jonah and Femi: pork belly on the grill, a seafood pancake, japchae, six little dishes of banchan, a bottle of soju. Nobody has “a plate”. Everybody has a bit of everything.

PlateDiary is built for exactly this. One photo, and each dish and drink is cut out on your phone into its own save. With Calories on, a read gives each dish one rough number, and you edit the pancake down to the two wedges you actually ate. The night stays under the restaurant, with Jonah and Femi on it.

Side by side

SnapCalorie and PlateDiary.

SnapCalorie and PlateDiary, from SnapCalorie’s own site and App Store listing and PlateDiary’s app (checked 19 October 2026)
SnapCaloriePlateDiary
AimMeasured precision per mealA rough number per dish, honestly labelled
From a photoPortions measured; depth on supported iPhonesEvery dish cut out; one “~” number each
Other ways inVoice notes, packaging labelsType your own number on any save
Health appsApple HealthKit syncNever written to a Health app
Beyond caloriesProtein, carbs and fatPlaces, companions, a diary of every meal out
CaloriesAlways onOff unless you turn them on

Precision vs a rough “~”

Why PlateDiary shows a tilde instead of a decimal.

Every PlateDiary estimate is one number with a “~” in front, rounded to the nearest 10 (or 50 past 1,000), and the Calories page says it out loud: photo estimates usually run low. That is not modesty for its own sake. A preliminary NIH test presented in July 2026 photographed 102 weighed meals and ran them through four photo apps — MyFitnessPal, Lose It!, Cal AI and Appediet. All four came in low, by about 250 to 345 calories on average, and missed about 30 g of fat. It is a conference abstract, not yet peer reviewed, but it matches what you would expect: a photo can’t see the butter.

What PlateDiary adds is memory. Correct the number for the tonkotsu at your local ramen bar once, and PlateDiary remembers your number for that dish at that place. If measured precision is what you are after, SnapCalorie — or a kitchen scale — is the better tool. We make PlateDiary, so weigh that in.

Choose

Choose SnapCalorie if… choose PlateDiary if…

  • Choose SnapCalorie if you eat one plate at a time, want the most measured estimate a phone can give, and want it in Apple Health.
  • Choose PlateDiary if you eat at shared tables, want every dish counted separately, and want the meal remembered with its place and people.
  • Choose a full tracker if you need barcodes, exercise or weight — PlateDiary has none of those.

In PlateDiary

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

Off unless you turn them on

Calories in PlateDiary are off unless you turn them on. Switch them on and, when PlateDiary AI reads your photo of the table, each dish gets one rough “~” number. Accept it or change it; a number you correct is remembered for that dish. With Calories off, the app looks exactly as it did before.

A read sends small pictures of the cut-out dishes, with the place's name as a hint — never the table photo, faces or your location. Calorie numbers never go to analytics, and nothing is written to a health app. PlateDiary AI starts with free tries; here is how it works.

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Sources

Where the facts come from

  1. SnapCalorie — official site
  2. SnapCalorie AI Calorie Counter, App Store listing
  3. Cal AI — official site and FAQ
  4. Newswise: photo-based calorie apps may underestimate energy in meals (NIH abstract, July 2026)

Questions

Questions people ask.

Is SnapCalorie accurate?

SnapCalorie says its computer vision beats trained human estimators and points to peer-reviewed research. Independent 2026 testing of four other photo apps found they all came in low, so any photo number is best treated as an estimate.

SnapCalorie vs Cal AI: what is the difference?

Both are photo-first and both say they use the phone’s depth sensor to estimate volume. Cal AI adds barcode scanning and workouts; SnapCalorie leans on measured accuracy and its Google Lens pedigree. Neither is built around a shared table.

Does PlateDiary measure portion size?

Not with a depth sensor. A read looks at small pictures of each cut-out dish and gives one rough number, which you can accept or correct.

Does PlateDiary work offline?

Snapping, the cut-outs, typing your own numbers and browsing the Calories page all work offline. An AI read needs a connection, and the app says so when you don’t have one.