The best AI calorie counter apps compared: photo, voice and barcode logging, and what to do with the numbers

Calorie counting got quicker. Here’s what it still misses

Counting calories used to mean searching a database for every ingredient, guessing the portion and typing it all in, three or four times a day. AI has changed that part. You can now take a photo of your plate, say what you ate, or scan a packet, and an app fills in the calories and nutrients in seconds.

The best apps are genuinely quick now. But speed isn’t the whole job. A photo can’t see the oil in the pan, and a number on its own doesn’t tell you what to cook tomorrow, that you’re training late on Tuesday, or that a friend with a nut allergy is coming for lunch on Saturday. A good AI calorie counter gets the counting right. A good nutritionist puts it to work.

How AI calorie counting works: photo, voice, barcode and label

Most of the apps below offer several ways to log, and each one suits a different kind of meal.

How accurate is a calorie counter that works from a photo?

Quick isn’t the same as exact, and the makers say so. Cal AI’s FAQ says it’s “about 80% accurate”. SnapCalorie’s FAQ puts its average error at around 15%, and by its own figures compares that with about 20% for nutrition labels and about 40% for dietitians estimating from a photo. These are the makers’ own numbers, not independent tests, and we haven’t tested them either.

The makers’ own tips point the same way:

• Good light, everything in view. Top-down photos with nothing stacked or hidden usually work best, MacroFactor says.
• Say what the camera can’t see. Add “fried in olive oil” or the dressing in a few words. SnapCalorie suggests a quick voice note, and MacroFactor lets you add a description to a photo.
• Give it something for scale. MacroFactor suggests your fist, a common object, or a food scale in the frame.
• Scan packets. For anything with a barcode or a label, scan that rather than photographing the food.
• Check what it found. MacroFactor and SnapCalorie let you edit every food the AI picked out, and SnapCalorie says it learns from your corrections.

Over a week, small misses add up, so treat a photo estimate as a good guide rather than a measurement. If you’re counting for a medical reason, ask a doctor or a registered dietitian how precise you need to be.

Retenna is built with this in mind. Its meal scan reads the volume and angles of what’s on your plate in 3D, to see what’s there and how much, and for anything the camera can’t see, such as the oil in the pan, you can say it or type it.

The top AI calorie counter apps at a glance

We picked seven apps that lead on reach or on how much of the logging AI does for you: the counters with the most App Store ratings that log from a photo, plus SnapCalorie and MacroFactor, which take more careful approaches. It’s an editorial pick, not a ranking. Noom logs meals with AI too, but it’s a coaching programme more than a counter, so our AI nutritionist guide covers it.

App by app

Cal AI

Cost

A subscription, after a 3-day free trial

Where

iPhone, iPad, Android, Apple Watch

App Store

4.8 from 373K ratings

Cal AI is built around one idea: point your camera at your plate. You answer a few questions to build a plan, then snap a photo, scan a barcode or describe your meal, and it breaks down the calories and nutrients. It has more App Store ratings than any other photo-first counter here, and its chief executive says it made over $40 million in sales in the 12 months before MyFitnessPal bought it, announced in March 2026. It still runs as a separate app, and it connects to Apple Health and Google Fit.

Worth knowingFood scanning results need a subscription, and the App Store lists prices from $2.99 to $29.99 without saying which period each covers. Its FAQ says it’s about 80% accurate and can’t yet import your MyFitnessPal history. TechCrunch (third party) reports it now uses MyFitnessPal’s food database. Its privacy policy says it doesn’t expressly sell information, but that some advertising cookies on its website may count as “selling” or “sharing” under US privacy laws, and that it may use targeted advertising.

MyFitnessPal

Cost

Free; Premium $19.99 a month or $79.99 a year; Premium+ $99.99 a year

Where

iPhone, iPad, Android, Apple Watch, web

App Store

4.7 from 2.4M ratings

MyFitnessPal has the biggest reach here: more than 280 million members in over 120 countries, and a database of over 20 million foods, including more than 68,000 brands and 380 restaurants. Logging by search is free. Premium adds Meal Scan (a photo of your plate), Voice Log and Barcode Scan, and since February you can take the photo now and log it later, on iPhone. Premium members also get the AI Coach, launched in June, which can now read a photo of your fridge and suggest meals. Premium+ adds a meal planner with grocery delivery. MyFitnessPal also owns Cal AI, and since January its recipes and calorie targets have been available inside ChatGPT.

Worth knowingPhoto, voice and barcode logging all need Premium, and so does an ad-free app. In March 2026 MyFitnessPal launched an ad network for brands that reaches its free users. When we checked its Coach help page on 22 October, the Coach was on iPhone only, in English, in six countries. If you’re thinking of leaving, our MyFitnessPal alternatives guide covers why people do and where they go.

Lose It!

Cost

Free; Premium prices vary by offer, including a lifetime option

Where

iPhone, iPad, Android, Apple Watch, web

App Store

4.8 from 782K ratings

Lose It! says more than 57 million people have used it, with a database of over 56 million foods and recipes. It works out a personal daily calorie budget from your profile and your goal, and logging, a plan and community groups are free. Premium adds photo meal logging, AI voice logging (“I had 2 eggs, toast with butter and jam”), the barcode scanner, macro and nutrient tracking, fasting, targets for each meal, and connections to Fitbit, Garmin, Withings, Apple Health and more. It also supports people taking GLP-1 medication, with dose logging.

Worth knowingThe barcode scanner is now a Premium feature. Its AI is about logging: chat coaching, allergies and planning for a household aren’t mentioned, and its meal planning means targets for each meal rather than planned meals. Its privacy policy allows using your data to develop and train AI tools, and selling or sharing some data for targeted ads, with an opt-out.

SnapCalorie

Cost

Free for 3 AI logs a day; Premium $19.99 a month or $149 a year

Where

iPhone, iPad

App Store

4.7 from 6.9K ratings

SnapCalorie was founded by former Google AI researchers who, it says, co-founded Google Lens. It’s built for accuracy: you snap a photo or dictate a voice note, and on iPhones with a depth sensor it measures the volume of the food rather than guessing it. It reads nutrition labels, checks foods against US Department of Agriculture data, tracks more than 100 nutrients, learns from your corrections and syncs with Apple Health. Its team published Nutrition5k, a study of 5,000 dishes with every ingredient weighed.

Worth knowingIt’s free for 3 AI logs a day; the App Store also lists other Premium prices from $9.99 to $99.99 without saying which period each covers. Its 15% average error is its own figure. It’s smaller than the others, with more than 100,000 active users by its own count, and although its site mentions Android, we couldn’t find it on Google Play in the US. It says it never sells your information.

MacroFactor

Cost

$11.99 a month, $47.99 for six months or $71.99 a year; 7-day free trial

Where

iPhone, iPad, Android

App Store

4.8 from 23K ratings

MacroFactor, from the Stronger By Science team, is a macro tracker with a coach built in. It estimates how much energy you really use from what you log, then adjusts your calorie and macro targets at a weekly check-in, with no warnings or red numbers when you go over. Its AI food logging turns a photo, or a photo with a description, into separate foods you can edit; Describe lets you type or say what you ate; and since July its label scanner reads labels in different formats and languages.

Worth knowingThere’s no free tier, only a 7-day trial. It’s built for hitting your numbers, so meal plans aren’t mentioned. It’s ad-free, and its privacy notice says it doesn’t sell your personal data or share it for cross-behavioural advertising.

Cronometer

Cost

Free; Gold $10.99 a month or $59.99 a year

Where

Web, iPhone, iPad, Android, Apple Watch

App Store

4.8 from 100K ratings

Cronometer is for detail: calories, macros and dozens of vitamins and minerals, from a database of more than 1.1 million verified foods. The barcode scanner is free. Gold adds photo logging, voice logging (to the app or to Siri), a recipe importer, a Macro Scheduler that sets different targets for each day of the week, no ads, and Crono Coach, announced in July: short guidance from your own diary, targets and settings. It connects to Apple Health, Fitbit, Garmin, Oura, WHOOP and more.

Worth knowingThe free version shows ads, and photo and voice logging need Gold. Its privacy policy allows using your food photos, comments and corrections to train its models, and says it hasn’t sold personal information in the last 12 months.

Lifesum

Cost

Free with limits; Premium from $29.99 for three months to $119.99 a year

Where

iPhone, iPad, Android, Apple Watch

App Store

4.6 from 151K ratings

Lifesum says 65 million people have joined it. You can log a meal by snapping a photo, speaking, typing it out or scanning a barcode. It builds nutrition plans from your goals, preferences, restrictions and activity, including keto, paleo and high-protein, offers meal plans with grocery lists, and gives you a weekly Life Score from what you eat and drink and how active you are. It syncs with Apple Health both ways.

Worth knowingIts listing says the free version has limited features, but not which ways of logging are free. In the App Store, Premium is $29.99 to $39.99 for three months, $69.99 for six or $99.99 to $119.99 a year. Its App Store privacy label lists identifiers as used to track you.

Also worth a look: FatSecret, which is free with photo recognition and a barcode scanner, and Yazio and Foodvisor, which also log from photos.

Where Retenna’s nutritionist goes further

Every app above counts, and the best of them count quickly. Retenna’s nutritionist counts calories and nutrients too, with the same quick ways to log and a few more, and then it puts what you log to work. Counting is a health feature, so it’s for adults aged 18 and over.

Yes

The maker documents it.

Partly

A lighter version: calorie targets you set, or that are worked out from your profile, rather than ones the maker says adapt as you go; targets for each meal, or for each day, that you set yourself rather than meals planned around your training; a meal suggestion or a plan generator rather than a planned week; dietary restrictions rather than allergies; grocery lists without the shop; or a serving count rather than each person at the table.

–Dash

Not mentioned in the maker’s own materials. That doesn’t prove it can’t.

The top rows are where the best apps meet, and Retenna is built to match them: like SnapCalorie, it reads the volume of what’s on your plate in 3D, and like MacroFactor, it adapts your targets as you go. The rest is the difference. Most counters stop at the total, and the few that plan meals still plan them without your week: none of them says it reads your calendar, so none knows that leg day moved to Tuesday or that four of you are eating at yours on Saturday.

Logging in secondsIts advanced meal scan reads the volume and angles of your plate in 3D, to see what’s there and how much. It scans barcodes and nutrition labels too, and takes your voice or a few typed words.

Often, just one tapMeals it planned for you log with one tap (“Had it?”), portions and leftovers included. It learns your usual meals, so they’re one tap as well, and notices when you swap something. And it reads restaurant menus and the order emails you choose to share, so eating out and ordering in are logged too.

Targets that keep up with youIt sets your calorie targets and adapts them over time from what you eat, how you train and how your body changes.

Then, because Retenna’s nutritionist shares one picture of your life with your trainer, your planner, your personal shopper and the people you love, what you log goes somewhere:

Next week’s mealsWhat you log teaches it what you actually make. The meals you come back to return on busy weeks, and the ones you keep swapping out stop appearing.

Your trainingIt tells your trainer how you’ve eaten around hard sessions, and when leg day moves, a high-protein dinner is ready that night.

The shopYour personal shopper knows what’s running low, and the shop is sized to the nights you’re in.

Everyone at your tableIt plans around your allergies and the foods you avoid, and around those of your household and your guests. Always check labels: it isn’t medical advice.

From a count to a plan: a week with Retenna’s nutritionist

Here’s a week where the counting does more than add up. You log as you go: a quick scan of your plate, a barcode, or one tap for anything it planned. Your trainer has moved leg day to Tuesday, Thursday is a big interview, and four of you are having lunch at yours on Saturday, including Sam, who has a nut allergy. Each note is what Retenna would show you, with its reason.

Everything you ate is logged and counted, most of it with one tap. And the numbers are working for you: meals you’ll actually cook, protein when leg day needs it, breakfast on the morning you’d have skipped it, and a lunch everyone can share. Allergies are planned around, not guessed: Retenna works from what you and your guests tell it, and you should always check labels. It isn’t medical advice.

How it learns from what you log, and how you shape it

Everything Retenna learns from what you log, cook, swap and undo goes into one living model of you that every expert shares. Each thing it knows shows where it came from, and you can see, change or forget any of it.

1. Day one It asks. Who you cook for, any allergies and foods anyone avoids, your weekly food budget, and what to connect, such as your calendar and Apple Health, Health Connect, Samsung Health and more. Coming from another app? It brings your food diary over, from apps such as MyFitnessPal.
2. Within weeks It suggests. It has learned your usual breakfast, so logging it is one tap, and it has noticed you order in on late nights unless dinner is ready, so before a late Tuesday it suggests cooking double on Monday, and waits for your yes.
3. In time It decides the way you would. The week’s meals planned from what you actually eat and the week you’re actually having, and your targets adapted as your training and your body change, all done and explained, with an Undo.

Your rulesYou choose what it simply does and tells you about after, and what waits for your yes. New spending asks first, and anything that involves another person, like asking Jo what they’d rather not eat, always asks first.

Numbers, or no numbersGentle mode tracks without numbers, just balance, protein or veg, and you can pause counting whenever you like.

A reason and an UndoEvery meal it plans says why, and every change can be undone. Keep undoing the same kind of plan, and it notices and suggests a rule, so you only say it once.

See, change or forgetYour living model is yours to read: “On late nights, you order in unless dinner is ready”, from 5 of your last 6. Change it or forget it, and it stops planning around it.

How to choose

If you only want to count, one of these will do it, and some do it very well. If you want what you log to plan your meals around your whole week, that’s Retenna.

For counting on its own

• Cal AIQuick photo logging with little set-upOwned by MyFitnessPal; scanning needs a subscription.
• SnapCaloriePortions measured with your iPhone’s depth sensorFree for 3 AI logs a day.
• MyFitnessPalThe biggest food database, with an AI CoachPhoto, voice and barcode need Premium.
• MacroFactorCalorie and macro targets that adapt each weekNo free tier.
• CronometerDetailed nutrients, with a free barcode scannerPhoto and voice need Gold.
• Lose It!Simple counting with a personal calorie budgetPhoto, voice and barcode need Premium.
• LifesumCounting with meal plans and a weekly Life Score

For counting that plans your week

What to check before you trust one

• How you feel about counting. Counting isn’t right for everyone, and it shouldn’t take over. Retenna has a gentle mode for this: it tracks without numbers, just balance, protein or veg, and you can pause counting at any time. If tracking food makes you anxious, or you have a history of disordered eating, talk to a doctor before you start. The NHS has advice on eating disorders and where to get help. Aim for steady, not fast, and let a professional tell you what’s right for you.
• Accuracy. Treat a photo estimate as a guide, not a measurement. Scan packets, mention the oil and the dressing, and check what it found.
• Allergies. Retenna and some of the apps above plan around allergies and foods you avoid, but no app, ours included, can promise a meal or a product is safe. Always check labels: it isn’t medical advice, so don’t rely on an app alone for a serious allergy.
• Health limits. Retenna’s experts, and the apps compared here, are not doctors, registered dietitians, physiotherapists or therapists. If you’re managing a medical condition, or medication that affects how you eat, get advice from a professional.
• Privacy. What you eat and your body are personal. Check whether your data is sold, shared for advertising or used to train AI, and whether you can delete it.
• Control. If it plans or buys for you, it should ask before it spends new money or involves anyone else, and every change should come with an Undo.

How Retenna’s nutritionist counts, and what it does next

Questions

Sources

• Cal AI: website, FAQ, privacy policy, App Store; MyFitnessPal’s acquisition announcement and blog post; third party: TechCrunch
• MyFitnessPal: Premium, 2026 Winter Release, AI Coach launch, Coach help, Meal Planner, ChatGPT app, MyFitnessPal Ads, App Store
• Lose It!: App Store, Calorie Schedule, privacy policy
• SnapCalorie: website, FAQ, App Store
• MacroFactor: AI food logging, how to log food, July 2026 update, privacy notice, App Store
• Cronometer: Gold, Crono Coach, privacy policy, App Store
• Lifesum: App Store
• Also mentioned: FatSecret, Yazio and Foodvisor on the App Store
• Health: NHS, eating disorders

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