Comparison

Calk vs Zero Cal

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calk

Read full description

Tired of logging every bite? Calk is a calorie counter that helps you manage your weight without keeping a food diary forever. It suggests ingredient swaps for the meals you already eat. As the changes become part of your routine, you can stop logging every meal. Your food and weight diary is free, with no ads. It's stored on your device and works offline after setup. HOW IT WORKS 1. Log your food and weight for about a month. 2. Calk shows you what to swap in your own meals. 3. Try the swaps until they become second nature. 4. Keep tracking your weight without logging every meal. If your eating habits or weight change, return to the diary. Your entries are still there. Calk sends a quiet notification if your weight trend persistently drifts off course. START WITH THE FOOD ON YOUR PLATE At home or eating out, choose a dish and adjust its ingredients, cooking method and portion to match what's on your plate. Include the oil and sauce, too — a photo won't tell you how much was used. Calk recalculates calories, protein, fat and carbs. No need to build a recipe from scratch, weigh every raw ingredient or search through dozens of similar entries. WEIGH IT, SAVE IT, THEN EYEBALL IT Weigh your cooked portion the first few times and tap the heart button to remember the mix. Next time the dish opens the same way — just adjust the portion by eye. You don't need a kitchen scale at every meal. YOUR CALORIE TARGET ADJUSTS AUTOMATICALLY Sticking to your plan but the scale won't budge? While you're logging, Calk compares your food intake with your weight changes each week and recalculates your calorie target. Walking and workouts are reflected in your overall energy use. You don't need to add back the calories your watch says you burned. SET YOUR OWN TARGETS AND LIMITS Set targets for calories, protein, fat, fiber and water, and limits for added sugar and salt. Calk never changes targets or limits you set yourself. WHAT TO CHANGE IN YOUR USUAL MEALS Your personal report shows which dishes add more calories to your day and suggests ingredient swaps. You'll also see which habits keep coming up. VARIETY IN YOUR DIET The variety map shows the vegetables, fruit, beans, grains and nuts in your diet. It also counts how many different plants you eat each week and month. FIBER, SUGAR, SALT AND MORE Track calories, protein, fat, carbs, fiber, water, added sugar, salt, different types of fat and glycemic load. See how much fruit and vegetables you eat, too. Your report also covers vitamins, minerals and omega-3. WHAT'S FREE Food logging, all 15 measures on the home screen, weight logging and the weight chart are free. Reports and detailed analytics come with the annual Calk Analytics subscription. New subscribers get the first month free, then the yearly price is charged. Your subscription renews automatically unless you cancel at least 24 hours before the current period ends. Payment is through your Apple ID. Manage or cancel your subscription in your App Store settings. Terms of Service: https://calk.me/legal/tos/ Privacy Policy: https://calk.me/legal/privacy-policy/

About

Zero Cal

Effortlessly track your daily calorie and macronutrient intake using AI-powered food logging. Choose from voice, text, photo, barcode, or label scanning to quickly log meals and monitor your progress with visual feedback.

Highlights
  • AI-powered food logging
  • Log via voice, text, photo, barcode, or label
  • Calorie and macro estimates
  • Visual progress tracking
  • AI food context analysis
  • Multi-language support
Features
Read full description

Logging food shouldn't take longer than eating it. Zero Cal gives you four quick ways to add a meal: • Describe what you ate in your own words • Take a photo and let AI estimate what's on the plate • Scan a barcode or nutrition label • Search more than four million foods See the whole day The calorie ring shows how much you have left. Protein, carbohydrate, and fat stay beside it, so you can check the numbers without digging through charts. Leave room for real life Your daily goal fills three quarters of the ring. The last quarter is a visible cushion for a bigger dinner or an unplanned snack. You can repeat recent meals, change portions, and follow your progress over 14 days. Ask Zero When you want more context, ask for a short AI read on food quality, processing, fullness, and possible blood sugar impact. Stay consistent A logging streak and calendar show which days you tracked. On weekends, a short report sums up the week: completed days, average calories and macros, and a couple of suggestions based on your logs. What you can do • Log by voice, text, photo, barcode, or label • Get calorie and macro estimates • Edit portions and ingredients • Set personal calorie and macro goals • Search foods, review history, and add past meals again • See your logging streak on a calendar • Get a weekend report on completed days, calories, and macros • Turn on logging reminders and weekly report notifications • Use the app in English, Spanish, or Russian • Choose a light or dark theme Zero Cal tracks nutrition. It does not give medical advice. Estimates can differ from the actual food, so check the label or another reliable source when accuracy matters. Zero Cal requires a subscription. Payment is charged to your App Store account. Subscriptions renew automatically unless you cancel at least 24 hours before the current period ends. You can change or cancel your subscription in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Calk4 screens
Zero Cal4 screens

Verdict

The call

Calk and Zero Cal are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Calk sells 1 in-app purchase, starting at $49.99 per year and Zero Cal sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Calk ships an update weekly, Zero Cal every 5 days. The most recent releases landed on November 9, 2026 and November 13, 2026 respectively.

ScorecardNo meaningful differences
Calk versus Zero Cal: the parameters behind the verdict, then further details
ParameterCalkZero Cal
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyWeeklyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Subscription
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS16.0 — better16.4
Further details — not scored
Size83 MB118 MB
Age rating17+4+
DeveloperEli PetukhovOleg Filimonov

In-app purchases

1 purchases

Calk

Subscriptions1
  • Calk Analytics1 Month trial$49.991 Year
2 purchases

Zero Cal

Subscriptions2
  • Zero Cal Monthly14 Days trial$9.991 Month
  • Zero Cal Yearly2 Months trial$89.991 Year

Questions

Is Calk free?
Calk is free to download, with in-app purchases available.
Is Zero Cal free?
Zero Cal is free to download, with in-app purchases available.
Do Calk or Zero Cal have ads?
Neither Calk nor Zero Cal shows ads.
Which is updated more often, Calk or Zero Cal?
Calk ships an update weekly, and Zero Cal every 5 days. Most recently, Calk was updated on November 9, 2026 and Zero Cal on November 13, 2026.

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