Comparison

Slim AI vs Fit75

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

Head to head
About

Slim AI

Analyze meals from photos to understand their nutritional impact, including calories and macronutrients. Track activity, hydration, and fasting with personalized goal setting and health score evaluations. Sync data with health apps for a comprehensive overview of your well-being.

Highlights
  • Photo-based meal analysis
  • Calorie and macronutrient breakdown
  • Health Score for ingredient quality
  • Food label scanning
  • Personalized meal suggestions
  • Activity, hydration, and fasting tracking
  • Health app integration
Features
Read full description

Slim AI is an AI calorie tracker that counts calories and macros from one photo of your meal. Every meal also gets a Health Score from 0 to 100, so you see how much you eat and what that food does for your body. You don't have to type anything or dig through a food database. Point the camera at your plate, check the numbers and fix anything that looks off with one tap. HOW SLIM AI WORKS 1. Answer a short questionnaire about your body, your goal and your lifestyle. 2. Get daily calorie and macro targets calculated for you, not for an average person. 3. Log meals with a photo, a barcode, a food label or your voice. 4. Follow your calories, protein, carbs, fat and Health Score in one place. LOG FOOD IN SECONDS • Meal photo: AI recognizes the food on your plate and estimates calories and macros • Barcode scanner for packaged food • Food label scanner that reads the nutrition table for you • Voice logging: say what you ate and Slim AI adds it to your food diary • One-tap fix for any value, so you always have the final say HEALTH SCORE: MORE THAN CALORIES Two meals with the same calories can do very different things to your body. Slim AI scores every meal by looking at its ingredients, how processed it is and how much sugar, fat and fiber it has. Four risk scores show how a meal may affect acne, bloating, brain fog and aging. You also see the vitamins (D, C, B12, folate, A), minerals (magnesium, iron, potassium, calcium, zinc) and other nutrients (fiber, omega-3, sodium, cholesterol, antioxidants) in each meal. BODY ANALYSIS Take a photo of your body and Slim AI estimates your body fat percentage as a range within seconds. Then generate an AI visualization of the shape you could reach and see it side by side with how you look today. Save it or share it with friends. A PLAN THAT FITS YOUR GOAL • Lose weight, maintain your weight or gain weight and build muscle • Calorie and macro targets based on your body, your activity and your goal • Goal weight and weekly pace matched to your weight, height and goal • Protein tracking against your daily target • Pick your eating style (classic, keto, carnivore, vegetarian, vegan or pescatarian) and your macros and recipes adjust to it RECIPES FROM YOUR PRODUCTS Not sure what to cook tonight? Slim AI creates recipes from the products you already have, matched to your diet, with step-by-step instructions, calories and macros. FASTING, WATER AND ACTIVITY • Intermittent fasting tracker with ready-made or custom fasting windows, a live countdown and your fasting history • Water tracker with a daily target • Steps, workouts and burned calories synced from Apple Health WHO SLIM AI IS FOR • People who want to lose weight without logging every ingredient by hand • Gym-goers who track protein and macros to build muscle or cut fat • Anyone on keto, vegan, carnivore or intermittent fasting who wants an easy food diary • People curious how their food affects their skin, energy and digestion • Anyone who wants to know their body fat and see what their goal physique could look like Health Score, risk scores and body fat estimates are for informational purposes only and are not medical advice. FREE TRIAL AND SUBSCRIPTION The annual plan starts with a 3-day free trial that gives you full access to every feature. Slim AI offers auto-renewable subscriptions, and an active subscription is required to use the app after the trial. Payment is charged to your Apple ID account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel it in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Contact: slimai.app/en/contact Learn more: slimai.app

About

Fit75

This AI-powered fitness coach offers personalized workouts, instant meal tracking via photo, and body composition analysis. It provides 24/7 AI coaching for nutrition and fitness advice, helping users achieve their health goals without needing multiple apps.

Highlights
  • AI coaching and nutrition advice
  • Customizable workouts by duration, intensity, and equipment
  • Instant meal logging with photo analysis
  • Body composition analysis with selfie
  • FitDad Score for fitness ranking
  • Progress tracking charts
Features
Read full description

Fit75 gets you to Day 75 of the challenge to transform your fitness. Every task your challenge asks for, tracked in one place. Log your workout, scan your dinner, tick your water. All you got to do is just show up. YOUR WORKOUT PLAN Don't know where to start working out? Tell Fit75 your goal, your equipment and how many days a week you train. You'll get a full custom plan based on real research from the best personal trainers. Follow the plan and achieve results. SCAN YOUR MEALS Point your camera at your plate. Fit75 reads the food and fills in calories, protein, carbs and fat. Unlike other calorie trackers Fit75 gives you a score for every meal and balances it against your goal. Hit your targets without any synthetic drugs. SIMPLE HABITS, SIMPLE TRACKER Water, steps, reading, progress photos and weight, all in one app. But Fit75 goes further. The app analyzes WHEN you do each task and gives you a score to help you optimize doing each action. This is how tasks turn into ROUTINE. PICK YOUR MODE 75 Easy is a 30 minute workout, 2L of water, clean meals and 10 pages a day. 75 Medium adds 10,000 steps and a longer session. 75 Hard adds a second outdoor workout, set hydration intake and a daily progress photo. IT'S ABOUT SHOWING UP Fit75 isn't like other 75-day challenge trackers or workout trackers. It's not about how many pounds you'll lose. Or how heavy you can lift. Fit75 is about saying you want to get fit -- and then finally doing it. The app is here to help you each day. See real progress every single day. See your trends. Your habits and insights. Just keep showing up and doing better each time. We'll get there!! 24/7 COACHING Other apps need you to screenshot or copy-paste your data to other AI or LLM websites. Fit75 lets you chat directly to an always available coach that's been trained on real research and leaders in the fitness industry. Ask why your lifts aren't progressing. Get meal suggestions. Discuss any trends or improvements you can make to your plan. Worried about privacy? So are we. That's why Fit75 NEVER stores any of your messages remotely. Your messages sent to AI companies are all anonymized and not tied to your account. FIT75 It's time to get fit. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://wu.studio/privacy

Screenshots

Slim AI4 screens
Fit754 screens

Verdict

The call

The clearest difference is rating: Fit75 at 4.6 against Slim AI's 3.8. Fit75 also leads on ratings volume (91 vs 6). Slim AI's advantage is iOS requirement (15.0 vs 26.0). On price, review sentiment, update cadence and ads 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. Slim AI sells 4 in-app purchases, starting at $9.99 per month and Fit75 sells 7 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Fit75 holds the better App Store score, 4.6 against 3.8. That said, the two scores are not equally well evidenced: Fit75 has 91 ratings behind it against 6, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Slim AI ships an update every 8 days, Fit75 weekly. Both last shipped on October 26, 2026.

Scorecard3 real differences · 7 level
Slim AI versus Fit75: the parameters behind the verdict, then further details
ParameterSlim AIFit75
PriceFreeFree
Rating3.8 (6 ratings)4.6 (91 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings691 — better
Update frequencyEvery 8 daysWeekly — better
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPod — betteriPhone
Requires iOS15.0 — better26.0
Further details — not scored
Size85 MB292 MB
Age rating12+4+
DeveloperFUTURESOFT MAZUREK I NIEDZIELA SPOLKA KOMANDYTOWAWorld United Studios Limited

Customer experience

Slim AI

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Fit75

All ratings91 ratings
Positive91.2%
Neutral6.6%
Negative2.2%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Slim AI

Subscriptions4
  • Monthly Plan$9.991 Month
  • App Access3 Days trial$22.991 Year
  • App Access$24.991 Year
Show 1 more
  • Annual Plan3 Days trial$34.991 Year
7 purchases

Fit75

Subscriptions7
  • Fit75 Unlimited$7.997 Days
  • FitDad Unlimited$14.991 Month
  • FitDad Unlimited$19.991 Month
Show 4 more
  • Fit75 Unlimited3 Days trial$47.991 Year
  • FitDad Unlimited$47.991 Year
  • FitDad Unlimited2 variants$59.991 Year
  • FitDad Unlimited3 Days trial$79.991 Year

Questions

Is Slim AI free?
Slim AI is free to download, with in-app purchases available.
Is Fit75 free?
Fit75 is free to download, with in-app purchases available.
Which has better reviews, Slim AI or Fit75?
Fit75 is rated higher. Slim AI averages 3.8 out of 5 from 6 ratings, while Fit75 averages 4.6 from 91 ratings.
Do Slim AI or Fit75 have ads?
Both Slim AI and Fit75 show ads.
Which is updated more often, Slim AI or Fit75?
Slim AI ships an update every 8 days, and Fit75 weekly. Most recently, Slim AI was updated on October 26, 2026 and Fit75 on October 26, 2026.

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