Comparison

Happy Scale vs BMI Calculator

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

Head to head
About

Happy Scale

This app helps you understand your weight loss journey by analyzing scale fluctuations. It smooths out daily variations to reveal your true progress, predict future weights, and break down goals into manageable milestones.

Highlights
  • See true progress with mathematical analysis
  • Smooth out weigh-in fluctuations
  • Predict future weight
  • Break down goals into milestones
  • Integrates with Apple Health
  • BMI calculator
Features
Read full description

Dieting is hard enough. But when you work hard, hop on the scale, and see a number that’s higher than yesterday? Well, that’s just not fair! It’s time to tame the scale! Happy Scale helps you make sense of the frustrating ups and downs of weigh-ins by using mathematical analysis to make sense of your scale weights. You’ll: • understand your true trend, • take the sting out of plateaus, and • be able to predict what you’ll weigh for an upcoming event • SEE YOUR TRUE PROGRESS: Happy Scale uses sophisticated math to learn the true trend of your progress. You can see what you’re really losing each week. • NO MORE PLATEAUS: Use the moving average progress tracking options to see steady progress every day! • SLOW AND STEADY WINS THE RACE: Have a lot to lose? Break your weight loss goal into small, incremental milestone goals so you can focus on short-term, achievable goals! • THE PERFECT SUPPLEMENT: Use this app in conjunction with other popular apps. Weight entries can be automatically imported from apps that support exporting to the Apple Health app, and Happy Scale will export all your weights to Apple Health so other apps can see them. • IMAGINE YOUR SUCCESS: See predictions about what you’ll weigh in the future if you keep up your current trends, and set commitment goals for yourself! • KNOW YOUR NUMBERS: Our new BMI calculator shows you exactly where you stand and what weight ranges you need to hit for different health categories. No more guessing if you’re almost there! • WORKS ON ALL YOUR DEVICES: Seamlessly sync between your iPhone and iPad! So, have your previous diets failed because you lost motivation? Try Happy Scale today and join thousands of users who use this app to TAME THE SCALE! ------------------ This app optionally integrates with Apple Health. It is an opt-in feature that’s accessible from the Settings menu. ------------------ If you purchase a monthly or yearly subscription, payment will be charged to your iTunes account. Your account will automatically be charged for renewal within 24-hours prior to the end of the current subscription unless you disable auto-renew. You can turn off auto-renewal at any time by going to your Account Settings on the App Store after purchase. Privacy Policy: https://happyscale.com/privacy Terms of Use: https://happyscale.com/terms

About

BMI Calculator

Calculate your Body Mass Index (BMI) using age, gender, height, and weight. Track your health progress, find your ideal weight, and receive tips for weight control. Supports metric and imperial units and syncs with Apple Health.

Highlights
  • Calculate BMI scientifically
  • Find ideal weight
  • Log BMI history
  • Track health progress
  • Sync data to Apple Health
  • Metric and imperial support
Features
Read full description

With this free BMI Calculator, you can calculate and evaluate your BMI (Body Mass Index) simply by entering age, gender, height and weight. It supports metric or imperial and is designed based on the WHO BMI classification. What You Can Do: - Calculate your BMI scientifically - Find your ideal weight & Get professional tips - Log your BMI history & Track your health progress - For everyone! Adults, teens, and children - Sync data to Apple Health Being overweight or obese increases the risk of obesity-related diseases, such as hypertension, heart disease and diabetes. It’s time to find your ideal weight. You can also use it to check your diet or weight loss effect. Why You Need It: Wanna know your BMI and weight changes at a glance? Want to prevent obesity-related diseases? Wish to know tips to reach an optimal weight? Look for a BMI calculator for your children? Download our app now as a useful starting point for your weight control and health improvement. Medical Disclaimer BMI Calculator: Weight Tracker shall not be treated as a professional medical service provider. Service does not substitute diagnosis, professional treatment, or medical advice from healthcare professionals. If you have experienced any medical conditions, please consult your doctor. Service is for educational and informational purposes only. You are completely aware that the information and data provided may not be accurate, secure, or comprehensive. Due to individual differences, Service is not available to everyone. Please request your doctor to access your suitability for Service. You confirm that you are fully responsible for your safety and health. BMI Calculator: Weight Tracker shall not be liable for any damage or loss in respect of any access or use of Service.

Screenshots

Happy Scale4 screens
BMI Calculator4 screens

Verdict

The call

The clearest difference is monetization model: BMI Calculator at free with in-app purchases against Happy Scale's subscription. BMI Calculator also leads on iOS requirement (11.0 vs 16.0). Happy Scale's advantage is ads (none vs shown) and update cadence (weekly vs every 13 months). On price, rating, in-app purchases and device support 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. Happy Scale sells 8 in-app purchases, starting at $1.99 per month and BMI Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Happy Scale against 4.9 for BMI Calculator. That said, the two scores are not equally well evidenced: Happy Scale has 58K ratings behind it against 374, so its average is the more settled of the two. Written reviews are what separate them: 91% of Happy Scale's written reviews are positive against 83% of BMI Calculator's.

UpkeepUpdate frequency

Happy Scale ships an update weekly, BMI Calculator every 13 months. The most recent releases landed on September 26, 2026 and September 23, 2026 respectively.

Scorecard7 real differences · 4 level
Happy Scale versus BMI Calculator: the parameters behind the verdict, then further details
ParameterHappy ScaleBMI Calculator
PriceFreeFree
Rating4.9 (58K ratings)4.9 (374 ratings)
Positive reviews91.5% of reviews — better83.3% of reviews
Number of ratings58K — better374
Update frequencyWeekly — betterEvery 13 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
Best chart rank#187 — better—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.011.0 — better
Further details — not scored
Size65 MB37 MB
Age rating12+4+
DeveloperFront Pocket Software LLCLeap Health

Customer experience

Happy Scale

All ratings57,904 ratings
Positive98.2%
Neutral1.2%
Negative0.6%
Written reviews715 reviews
Positive91.5%
Neutral1.7%
Negative6.9%

BMI Calculator

All ratings374 ratings
Positive96.8%
Neutral0.5%
Negative2.7%
Written reviews60 reviews
Positive83.3%
Neutral6.7%
Negative10.0%

User reviews

Happy Scale

From 58K App Store ratings

What we love

  • 👍 Excellent weight loss support tool
  • 👍 Motivating and engaging to track weight
  • 👍 Provides great insights and predictions
  • 👍 Smooths out weight fluctuations
  • 👍 Breaks down weight loss journey into milestones

Room to improve

  • 🐛 Reminders don't work for some users
  • 💰 Subscription model is expensive for some

BMI Calculator

From 374 App Store ratings

What we love

  • 👍 Easy to use and understand
  • ✅ Accurate BMI calculation
  • 📈 Helpful for tracking weight
  • 😊 Improves self-esteem
  • ✨ Pleasant visual design

Room to improve

  • 🤔 Discrepancy with doctor's advice
  • ⚠️ Can cause insecurity about weight
  • 📉 Graph scale not ideal for weight loss
  • 🚫 Ads can be intrusive
  • 🤷‍♀️ Some users disagree with weight categorization

Bugs and requests

Happy Scale

Reported bugs

1 issue
  • Reminders don't work for some users

Requested features

4 requests
  • Add ability to track body measurements and body fat percentage
  • Provide more chart/graph options (60-day, 6-month)
  • Add a watch app or complication for easier access
  • Implement more celebratory features when reaching goals

BMI Calculator

Reported bugs

4 issues
  • App crashes when entering decimal weight
  • App crashes when entering second day's weight
  • App crashes when pressing the 'day' button
  • App crashes on second day's input

Requested features

5 requests
  • Add messages and tips for different weight categories (underweight, overweight, obese)
  • Implement dark mode
  • Allow data storage for multiple users
  • Adjust graph scale for better visibility of weight loss
  • Allow input of decimal numbers for weight

In-app purchases

8 purchases

Happy Scale

Subscriptions2
  • Happy Scale Deluxe (Monthly)7 Days trial$1.991 Month
  • Happy Scale Deluxe (Yearly)7 Days trial$11.991 Year
One-time6
  • Tip $1$0.99
  • Tip $3$2.99
  • Tip $5$4.99
Show 3 more
  • Tip $10$9.99
  • Happy Scale Premium (Lifetime)$39.99
  • Happy Scale Deluxe (Lifetime)$39.99
1 purchases

BMI Calculator

One-time1
  • Remove Ads$2.99

Questions

Is Happy Scale free?
Happy Scale is free to download, with in-app purchases available.
Is BMI Calculator free?
BMI Calculator is free to download, with in-app purchases available.
Which has better reviews, Happy Scale or BMI Calculator?
Happy Scale and BMI Calculator are both rated 4.9 out of 5 on the App Store, from 58K and 374 ratings respectively.
Do Happy Scale or BMI Calculator have ads?
BMI Calculator shows ads; Happy Scale does not.
Which is updated more often, Happy Scale or BMI Calculator?
Happy Scale ships an update weekly, and BMI Calculator every 13 months. Most recently, Happy Scale was updated on September 26, 2026 and BMI Calculator on September 23, 2026.

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