Calsy: 21 Reset
Food Scanner & Macro Tracker
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Diets fail because they never end. Calsy gives you 21 days, simple daily rules, and an AI calorie counter that scores every meal. Day 1 starts now.
Calsy is a 21-day reset for people who are done with diets that drag on forever. You get a start line, a few rules a day, and an AI that logs your meals from a single photo. On Day 21 you step on the scale and see what changed.
No food diary. No weighing every bite. No willpower marathon. Twenty-one days you can actually finish, and habits that stay with you when they are over.
HOW THE 21-DAY RESET WORKS
1. Day 1: weigh in and take your start photo (optional)
2. Every day: scan your meals, drink your water, hit your steps
3. From Day 4 the bar rises: meals graded C or better, stay under your calorie budget, 30 minutes of movement
4. Day 21: final weigh-in, second photo, before-and-after side by side
The reset runs in four phases: See It, Clean It, Tighten It, Prove It. Each one asks a little more than the last, so it gets harder exactly as you get stronger.
RULES THAT TICK THEMSELVES
Other challenge apps are checklists you have to remember to tick. Calsy already knows you scanned two meals, logged your water and walked your steps, so the rule turns green on its own. You live your day. The app keeps score.
SNAP IT. SCORE IT.
Take a photo of your plate. In seconds Calsy's AI logs calories, protein, carbs, fat, fiber, sugar and sodium, and grades the meal from A to F. One glance tells you whether it counts toward your reset. Barcode scans and Health Scores work the same way for packaged food.
WATCH IT WORK
A weight trend that smooths out the daily noise, a journal that marks every day you logged, and a line that goes the right direction. Seeing it drop on Day 12 is what gets you to Day 21.
DISCIPLINE THAT OUTLASTS THE RESET
Twenty-one days of the same small rules does something no diet ever did for you: it makes them automatic. Scanning before you eat. Drinking your water. Moving every day. Checking the grade before you order. By Day 21 you are not following rules anymore, you just eat like this. The weight is the result. The discipline is what you keep.
AFTER DAY 21
Finish Baseline and unlock Strict. Finish Strict and unlock Full. Every reset raises the bar, so your next 21 days start where the last ones ended. And between resets Calsy stays the easiest calorie counter you have used: snap, log, done.
TARGETS BUILT AROUND YOUR BODY
Lose fat, build muscle, or just eat better. Calsy sets your daily calorie and macro budget from your body, your activity and your goal. Not someone else's numbers.
*** CALSY PREMIUM ***
Start free, then unlock the full reset:
- Unlimited AI food recognition from photos, with meal grades
- Unlimited barcode scans and Health Scores
- Custom macro targets for keto, high protein, or cutting
- Detailed analytics of your nutrition and weight trends
Twenty-one days is short enough to finish and long enough to change how you eat. Download Calsy and start Day 1.
Note: Calsy does not provide medical advice. Consult a professional before starting a new nutrition plan.
Calsy offers an auto renewing subscription. Payment is charged to your Apple ID at confirmation of purchase. Your subscription renews automatically unless you cancel at least 24 hours before the end of the current period. You can manage or cancel anytime in your App Store account settings.
Terms of Use: https://www.calsy-app.com/terms
Privacy Policy: https://www.calsy-app.com/privacy
NEW: 21 Reset — your 21-day challenge. Weigh in and start Day 1.
Bug fixes and performance improvements.
The developer, MITOLOGIC sp. z o.o., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Purchases
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer indicated that this app doesn’t support certain accessibility features. Learn More about the accessibility features.
Information
- Seller
- Mitologic sp. z o.o.
- Size
- 47.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later. - Apple Watch
Requires watchOS 11.6 or later.
- iPhone
- Languages
English and 33 more
- English, Arabic, Bengali, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
13+
- 13+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Premium Annual $39.99
- Premium Annual Promo $24.99
- Premium Monthly $9.99
- Premium Weekly $4.99
- Copyright
- © 2026 MITOLOGIC Sp. z o.o.