Over the past year, AI calorie apps have flooded the App Store: snap a photo, get a number, skip the logging. Millions downloaded them. The problem is accuracy.
From a photo, an app has to guess the weight first and whether that pasta is 90 grams or 160. Every calorie figure inherits that error. Qalzy puts a camera on a kitchen scale, so the count is built on a real measurement.
1. Photo apps were off by as much as 64%
Researchers testing three leading AI models on 52 food photos found the best two were off by around 36% on weight and energy. The third was wrong by as much as 64% (Fridolfsson et al., 2025).
NIH scientists found consumer apps underestimated meals by 250 to 345 calories — about a third too low (ScienceDaily).
On an 1,800-calorie target, a third is the difference between losing weight and standing still. Qalzy weighs food to the gram before anything is logged.
2. It recognises more than 2.9 million foods
The scale has a built-in AI camera that identifies what’s in front of it: raw, cooked, packaged, even a plate with several things on it, checked against a database of 2.9 million foods.
No typing, no scrolling past fourteen versions of “chicken breast”, no deciding which one is closest to what you’re actually eating.
And it logs more than calories. Protein, carbs, and fat come with vitamins and minerals, everything is logged in the app so you have a holistic view of your nutrition.
3. Logging a meal takes about two seconds
This is the part that decides whether you’re still tracking next month. Place your food, tap once, check the output. Qalzy puts that at around two seconds per meal, roughly 10× faster than typing it into an app.
There’s nothing to set up before each meal and nothing to correct afterwards. Save a recipe once and reuse it with a single tap, and your regular breakfast becomes one press.
Two or three minutes of logging per meal is a chore you’ll eventually skip. Four seconds isn’t.
4. You can log without picking up your phone at all
The scale connects over WiFi and works on its own, so a meal can be logged while you’re still cooking, with your hands full and your phone in another room.
Everything syncs to the free app when you want to look at it, and the app connects to Apple Health and Google Health Connect if you track elsewhere too. It supports up to nine profiles, so a household doesn’t need nine devices, and the app is free.
5. Rated 4.7/5 from thousands of users
Qalzy now has a community of 435,000 members and a 4.7/5 rating from early adopters, and the pattern in the reviews is consistency rather than novelty: the tracking gets easy enough that people keep doing it.
The bottom line
If calorie tracking has never stuck for you, it’s worth asking whether the method was the problem rather than your willpower. Qalzy takes the two hardest parts, judging the portion and finding the food, and does them for you.
It comes with a 30-day money-back guarantee and a 1-year warranty, so you can test it without any risk.