DietX vs Cal AI: Two Photo-First Calorie Trackers Compared

By the DietX team · Updated November 4, 2026 · 7 min read

In DietX vs Cal AI, you're choosing between two photo-first calorie trackers that both need a subscription. Pick Cal AI if you mainly want to scan meals and like having MyFitnessPal behind the app. Pick DietX, which we make, if you also want voice logging, meal plans, AI Cook and a place for water, sleep and steps, and you're fine with a young app that has just 20 ratings.

What DietX and Cal AI have in common

More than you might expect. Both are built around photographing your food, and both also let you describe a meal in words or scan a barcode. Both rely on a subscription: DietX says it "does not offer a free subscription tier," and Cal AI says "Food scanning analysis results require a subscription." Both give you a free trial to start.

They share a limit too. A photo can't show the oil in the pan, and research on the method finds portions harder than identification, which we cover in how accurate AI calorie counters are.

DietX vs Cal AI side by side

Prices are US App Store listings. "Not stated" means Cal AI's pages, as checked, didn't confirm it. Cal AI may well offer some of these, so treat that as a question to check and not as a missing feature.

Where Cal AI comes out ahead

The company behind it. Cal AI has sat under MyFitnessPal since the acquisition announced on 2 March 2026, while continuing as a standalone product. MyFitnessPal has the longest history of the apps we compare and a far larger user base than DietX. DietX is a small, young app, and 4.5 from just 20 ratings isn't enough to tell you much. If you'd rather not bet on a newcomer, this counts.

A simple need. If you only want to point your camera at dinner and move on, DietX's meal plans and habit logs won't be worth much to you, and Cal AI's scan-first approach may be all you want.

A clear trial length. Cal AI lists a 3-day free trial. DietX's free trial has no stated length.

A lower starting price on the listing. Cal AI's in-app purchases start at $2.99, below DietX's lowest listed price of $4.99 a week. But plan names aren't shown, so we can't tell you what $2.99 buys or how long it lasts.

Where DietX comes out ahead

Everything in this list is stated by DietX. Cal AI's pages, as checked, didn't confirm the same, so some of this gap may be about what each page says.

Voice logging. You can say what you ate, which helps when you've already finished the meal or the light is bad. Cal AI lets you describe a meal, and whether that includes voice isn't stated.

Meal plans, recipes and AI Cook. DietX builds personal meal plans and recipes around your goal, with vegetarian, vegan and other preferences taken into account. AI Cook finds recipes from YouTube.

Daily habits beside your food. You can log water, sleep, steps and workouts, follow weight, BMI and trends, and keep track of fasting and daily habits. It connects to Apple Health if you allow it.

A readable yearly price. DietX lists yearly plans at $17.99 to $29.99 on the US App Store, although several price points exist and the store doesn't say who sees which. Weekly plans cost far more over time: $4.99 × 52 is $259.48.

What we can't tell you

We'd rather list these than guess.

• Which is more accurate. No independent test in our sources compares them, and accuracy percentages on vendor sites are the vendors' own. We have no accuracy figure for DietX, and its listing says estimates may vary. Our guide on counting calories from a photo has tips that help in either app.
• What Cal AI costs per year. The listing shows a range without plan names.
• How many people use Cal AI, or what it connects to. We don't have verified figures or a confirmed list of its integrations. If you need it to work with a particular service, check its listing first.
• What the acquisition changes. Cal AI continues as a standalone product. Whether it shares anything with MyFitnessPal isn't stated.

Which one fits your day?

Picture how you'd really use it.

You eat most meals at a table and just want a number. Either works, and you might not use DietX's extras, so Cal AI may be all you need.

You often log an hour later, on the bus. You have no photo by then. Both let you describe the meal. With DietX, you can also say it out loud.

You're stuck on what to cook. DietX's meal plans and AI Cook are aimed at this. Cal AI's pages don't state an equivalent.

You want to see sleep and steps next to your food. DietX keeps them in one app, which can help you spot patterns of your own.

You want a brand with a long record behind the app. Cal AI, through MyFitnessPal.

You don't want to pay at all. Neither, on what's stated. SnapCalorie says its core features are free, and our guide to Cal AI alternatives covers that and others.

You want micronutrient detail or macro coaching. Neither is the specialist here. Cronometer and MacroFactor are better fits, as we explain in the best calorie counter apps.

How to compare them yourself

Since our sources include no outside test that settles this, a home test is the best evidence you can get. We haven't run one, and your own meals are what count. Cal AI's trial is 3 days, so plan around that.

Use the same meal in both apps. Here's a plate you can weigh, using USDA values for the foods as prepared:

Photograph it in each app and note three things: the first estimate, how long the correction took, and whether either noticed the butter. Without it, the plate is 413 kcal, so that's your clue. Then log a meal you've already eaten, without a photo.

Repeat with two or three meals you often eat, since a single plate proves little. Whichever you keep, remember the app gives you an estimate and you still decide what to do with it. Results vary, and calorie counting isn't for everyone, so if tracking starts to feel stressful, it's fine to stop and ask for help.

If DietX sounds closer to what you need, you can see how DietX works. It's free to download with a free trial, and Premium is a subscription. Weighing it against the bigger name? We also compare DietX and MyFitnessPal.

Frequently asked questions

Sources

1. DietX on the App Store
2. Cal AI on the App Store
3. Cal AI
4. TechCrunch: MyFitnessPal has acquired Cal AI
5. USDA FoodData Central (SR Legacy)
6. NHS: Eating disorders

General information, not medical advice. Talk to a doctor or dietitian before changing your diet, especially if you are pregnant, under 18 or have a health condition. If tracking food makes you anxious or you have a history of disordered eating, please skip calorie counting and ask a professional for support.