Comparison

BMI calculator vs Simby

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

Head to head
About

BMI calculator

Features
Read full description

Weight loss starts with clarity. WeightNote is a simple BMI calculator and daily weight tracker — built for people who want to make progress without obsessing over every detail. Log your weight in seconds. Watch your BMI shift as you stay consistent. Clear trends replace guessing. Small wins turn into real progress. No pressure. No complexity. Just steady movement toward a healthier you. Everything is included with WeightNote Pro. There's no free tier — every feature is unlocked with a Pro subscription. BMI calculator Daily weight logging Trend tracking & progress overview Choose the plan that works for you: Weekly — full access, billed weekly Yearly — full access, billed once a year (best value) Subscriptions are charged to your Apple ID. Cancel anytime in your App Store settings. Unused trial time is forfeited when a subscription is purchased. https://snapmonolab.com/mobile-app-terms-of-use/

About

Simby

Features
Read full description

Simby is the calm, all-in-one tracker for your baby's first years — feeding, diapers, sleep, growth and health, beautifully organized and always a tap away. Whether it's a 3 a.m. feed or a pediatrician visit, Simby helps you capture what matters and see the patterns behind it. FEEDING • Breastfeeding with left/right timers • Bottles and solids • Pumping sessions and a milk stash tracker DAILY CARE • Diapers, sleep and water intake • Walks, play, tummy time, bath and teeth brushing GROWTH & HEALTH • Weight, height and temperature with clear charts • Symptoms, medications and doctor visits • Vaccination schedule tailored to your country (US, Canada, Europe and more) with reminders MILESTONES & MEMORIES • Track first smiles, steps and words on a beautiful timeline • Save photos and special moments GUIDANCE WHEN YOU NEED IT • AI-powered specialists for sleep, feeding, health, development and parenting • Fast, personalized answers to everyday questions (AI guidance is informational and does not replace your pediatrician) CALM YOUR BABY • Built-in soothing sounds and lullabies for easier sleep MADE FOR FAMILIES • Share your baby's profile with your partner in real time • Export data as PDF/CSV for your pediatrician • Available in 6 languages • Private by design — your family's data stays yours SIMBY PRO Unlock unlimited AI specialists, full history, data export, memories and sharing. • Monthly or annual subscription; auto-renews unless cancelled 24h before the period ends — manage anytime in Settings Simby is an informational and organizational tool. It is not a medical device and does not provide medical advice, diagnosis or treatment. Always consult a qualified pediatrician for medical concerns. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://legal.simbyapp.com/

Screenshots

BMI calculator4 screens
Simby4 screens

Verdict

The call

The clearest difference is update cadence: Simby at every 3 weeks against BMI calculator's every 6 weeks. Simby also leads on iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. BMI calculator sells 2 in-app purchases, starting at $0.99 per 7 days and Simby sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

BMI calculator ships an update every 6 weeks, Simby every 3 weeks. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

Scorecard2 real differences Ā· 4 level
BMI calculator versus Simby: the parameters behind the verdict, then further details
ParameterBMI calculatorSimby
PriceFreeFree
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.015.1 — better
Further details — not scored
Size28 MB68 MB
Age rating4+12+
DeveloperJeronimo LandauerVESELA NIKOLAEVA MARINOVA

In-app purchases

2 purchases

BMI calculator

Subscriptions2
  • Weekly Access$0.997 Days
  • Yearly Access$14.991 Year
2 purchases

Simby

Subscriptions2
  • Simby Premium Monthly$4.991 Month
  • Simby Premium Annual7 Days trial$39.991 Year

Questions

Is BMI calculator free?
BMI calculator is free to download, with in-app purchases available.
Is Simby free?
Simby is free to download, with in-app purchases available.
Do BMI calculator or Simby have ads?
Neither BMI calculator nor Simby shows ads.
Which is updated more often, BMI calculator or Simby?
BMI calculator ships an update every 6 weeks, and Simby every 3 weeks. Most recently, BMI calculator was updated on October 2, 2026 and Simby on October 10, 2026.

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