Comparison

Calsy vs thinr

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

Head to head
About

Calsy

Effortlessly track your nutrition with AI-powered food recognition. Simply snap a photo of your meal to instantly log calories, macros, and health scores. Set personalized targets and visualize your progress to achieve your health goals.

Highlights
  • AI food recognition from photos
  • Barcode scanner with health scores
  • Personalized calorie and macro targets
  • Progress visualization with charts
  • Quick add and history for favorite meals
  • Automatic data backup and sync
Features
Read full description

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

About

thinr

Read full description

Powered by group dynamics. Built in the UK. Most diets fail by month two. Not because they're bad plans — because you do them alone. thinr puts you in a weight loss group of around 12 people. You all weigh in on the same day, every week. You see how everyone's getting on. They see you. It's totally anonymous, but it works. Massively. This is what Weight Watchers and Slimming World figured out 60 years ago. We're just the version that fits in your pocket. WHAT YOU GET — A group of around 12 people on your weigh-in day — A weekly board showing how everyone did — Daily commitments you set yourself — Your weight, photos, and progress over time — Optional GLP-1 tracking if you're on medication WHY IT WORKS Sustainable weight loss isn't about a magic plan. It's small daily things you can actually stick to — and people watching to see if you do them. You set commitments. You tick them off as you go. Once a week you weigh in. Your group does the same. Over time, you see what's working. NO DIETS, NO TRICKS — No calorie counting — No meal plans — No points systems — No before/after pressure — No paywalls Free to use. No sign up. WHO IT'S FOR People who've tried diets and want something different. People on GLP-1 medications who want to track properly. People who just need eleven other people watching to actually stick to it this time. Built in the UK. Made for the long game. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Calsy4 screens
thinr4 screens

Verdict

The call

The clearest difference is in-app purchases: thinr at none against Calsy's 4. thinr also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

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. Calsy sells 4 in-app purchases, starting at $4.99 per 7 days. thinr asks for nothing beyond the download.

UpkeepUpdate frequency

Calsy ships an update every 8 days, thinr fortnightly. The most recent releases landed on September 21, 2026 and September 24, 2026 respectively.

Scorecard2 real differences · 7 level
Calsy versus thinr: the parameters behind the verdict, then further details
ParameterCalsythinr
PriceFreeFree
Rating4.7 (60 ratings) — better—
Number of ratings60 — better—
Update frequencyEvery 8 days — betterFortnightly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size45 MB6 MB
Age rating12+17+
DeveloperMITOLOGIC sp. z o.o.TLR Labs

In-app purchases

4 purchases

Calsy

Subscriptions4
  • Premium Weekly$4.997 Days
  • Premium Monthly$9.991 Month
  • Premium Annual Promo7 Days trial$24.991 Year
Show 1 more
  • Premium Annual7 Days trial$39.991 Year
None

thinr

No in-app purchases

Questions

Is Calsy free?
Calsy is free to download, with in-app purchases available.
Is thinr free?
thinr is free to download, with no in-app purchases.
Do Calsy or thinr have ads?
Calsy shows ads; thinr does not.
Which is updated more often, Calsy or thinr?
Calsy ships an update every 8 days, and thinr fortnightly. Most recently, Calsy was updated on September 21, 2026 and thinr on September 24, 2026.

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