Comparison

Weight Diary vs Happy Scale

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

Head to head
About

Weight Diary

Track your weight loss journey with a clear trend line to visualize progress. Log daily weights, estimate loss rates, and plan for your goals. Supports custom start dates and integrates with health platforms.

Highlights
  • Daily weight logging
  • Clear trend line visualization
  • Progress and goal tracking
  • Custom start date setting
  • Apple Health and scale sync
  • BMI and calorie calculators
  • Data backup and export
Read full description

Understand your weight trends over time. Weight Diary helps you cut through daily fluctuations with a clear trend line, so you can quickly see whether you’re moving toward your goal. Log your weight each day to track your progress, estimate your rate of weight loss, and see how long it may take to reach your target. Starting a new diet or routine? Choose a custom start date to measure progress from any point that matters to you. With powerful graphs, goal planning tools, Apple Health support, and Withings/Fitbit scale sync, Weight Diary gives you a simple and effective way to stay on track. Main Features: • See your weight, progress, and goal remaining at a glance • Choose a custom start date for a new diet or milestone • Follow your daily weights with a clear trend line • Switch between the graph, summary, or full weight log with a single tap • Explore your progress over months or years in the full-screen graph • Record body fat % and add custom notes • Plan ahead with goal and calorie calculators • View your BMI with a clear visual display • Comprehensive unit support for pounds, kilograms, and stones • Sync with Apple Health and Withings/FitBit scales • Full data backup, import, and export

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

Screenshots

Weight Diary4 screens
Happy Scale4 screens

Verdict

The call

The clearest difference is price: Happy Scale at Free against Weight Diary's $7.99. Happy Scale also leads on update cadence (weekly vs every 6 months) and ratings volume (58K vs 2.6K). Weight Diary's advantage is in-app purchases (none vs 8). On rating, review sentiment, ads and chart position 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

Happy Scale is free to download; Weight Diary costs $7.99 up front. Happy Scale sells 8 in-app purchases, starting at $1.99 per month. Weight Diary asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Weight Diary against 4.9 for Happy Scale. That said, the two scores are not equally well evidenced: Happy Scale has 58K ratings behind it against 2.6K, so its average is the more settled of the two. Written reviews are what separate them: 96% of Weight Diary's written reviews are positive against 91% of Happy Scale's.

UpkeepUpdate frequency

Weight Diary ships an update every 6 months, Happy Scale weekly. Both last shipped on September 24, 2026.

Scorecard6 real differences · 5 level
Weight Diary versus Happy Scale: the parameters behind the verdict, then further details
ParameterWeight DiaryHappy Scale
Price$7.99Free — better
Rating4.9 (2.6K ratings)4.9 (58K ratings)
Positive reviews96.2% of reviews — better91.5% of reviews
Number of ratings2.6K58K — better
Update frequencyEvery 6 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
Best chart rank#73 — better#199
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.0 — better
Further details — not scored
Size11 MB65 MB
Age rating4+12+
DeveloperCURLYBRACE APPS LTDFront Pocket Software LLC

Customer experience

Weight Diary

All ratings2,592 ratings
Positive98.1%
Neutral1.2%
Negative0.7%
Written reviews526 reviews
Positive96.2%
Neutral2.3%
Negative1.5%

Happy Scale

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

Bugs and requests

Weight Diary

Not enough reviews yet to summarise bugs or 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

In-app purchases

None

Weight Diary

No 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

Questions

Is Weight Diary free?
Weight Diary costs $7.99, with no in-app purchases.
Is Happy Scale free?
Happy Scale is free to download, with in-app purchases available.
Which has better reviews, Weight Diary or Happy Scale?
Weight Diary and Happy Scale are both rated 4.9 out of 5 on the App Store, from 2.6K and 58K ratings respectively.
Do Weight Diary or Happy Scale have ads?
Neither Weight Diary nor Happy Scale shows ads.
Which is updated more often, Weight Diary or Happy Scale?
Weight Diary ships an update every 6 months, and Happy Scale weekly. Most recently, Weight Diary was updated on September 24, 2026 and Happy Scale on September 24, 2026.
Which is more popular, Weight Diary or Happy Scale?
Weight Diary currently peaks at #73 in the App Store charts, and Happy Scale at #199. Chart position reflects recent download velocity rather than total install base.

Other comparisons