Comparison

BMI Calculator vs Retainer Timer

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

Head to head
About

BMI Calculator

Calculate and track your Body Mass Index (BMI) with this user-friendly app. It provides personalized health insights, ideal weight recommendations, and supports various units and classification systems. Monitor your weight journey and understand health risks.

Highlights
  • Instant BMI calculation with animated gauge
  • Personalized health insights
  • Ideal weight recommendations
  • Metric and imperial unit support
  • WHO and DGE classification systems
  • Age and gender-specific calculations
  • Offline functionality
Features
Read full description

Calculate and track your Body Mass Index (BMI) with the most accurate and user-friendly BMI calculator app. KEY FEATURES: • Instant BMI calculation with animated visual gauge • Personalized health insights and ideal weight recommendations • Support for metric kg/cm, imperial lbs/ft, and British stones units • Choice of WHO or DGE German Nutrition Society classification systems • Age-specific calculations for children ages 7 and up, plus adults • Gender-specific BMI evaluation for accurate results • Color-coded BMI categories with real-time visual feedback • Clean, intuitive interface with instant calculations HEALTH BENEFITS: • Monitor your weight loss or weight gain journey • Understand health risks associated with your current BMI • Set realistic goals for achieving your ideal weight • Track progress toward a healthier lifestyle • Early detection of weight-related health concerns CLASSIFICATION SYSTEMS: Choose between two professional BMI classification systems: WHO - World Health Organization: - Underweight: BMI below 18.5 - Normal weight: BMI 18.5-24.9 - Overweight: BMI 25-29.9 - Obese: BMI 30 and above DGE - German Nutrition Society: - Gender-specific BMI ranges - Alternative classification for European standards ADVANCED FEATURES: • Visual BMI gauge with animated indicator • Supports ages 7 and up with child-specific growth charts • Settings persistence - remembers your preferences • Works offline - no internet connection required • Adults-only mode option available IMPORTANT NOTE: BMI is a screening tool that provides a general health indicator. It doesn't account for muscle mass, bone density, or body composition. Always consult healthcare professionals for personalized medical advice. Questions or feedback? Contact us at info@appovo.com

About

Retainer Timer

This app helps users remember to put in their dental retainers or clear aligners after eating. It provides notifications and tracks daily statistics for wear time, with cloud storage for seamless device switching.

Highlights
  • Wear time reminders
  • Daily statistics
  • Cloud data storage
  • Device switching
  • Progress tracking
Features
Read full description

Do you have a product like Invisalign, a retainer or a clear aligner? Do you forget to put them back in after eating? Well, the solution is here! Retainer Timer will make sure you remember with notifications while also allowing you to view your statistics for previous days. During the day you can check your current grade for the day or look at the final grade for previous days. All of this data is stored in the cloud allowing you to switch devices freely and keep your progress and stats.

Screenshots

BMI Calculator3 screens
Retainer Timer4 screens

Verdict

The call

The clearest difference is rating: BMI Calculator at 4.5 against Retainer Timer's 1.0. BMI Calculator also leads on ratings volume (30K vs 2). Retainer Timer's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 17.0). On price, update cadence, ads 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. BMI Calculator sells 1 one-off in-app purchase. Retainer Timer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

BMI Calculator holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: BMI Calculator has 30K ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on November 8, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
BMI Calculator versus Retainer Timer: the parameters behind the verdict, then further details
ParameterBMI CalculatorRetainer Timer
PriceFreeFree
Rating4.5 (30K ratings) — better1.0 (2 ratings)
Positive reviews47.2% of reviews—
Number of ratings30K — better2
Update frequencyFortnightlyFortnightly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.011.0 — better
Further details — not scored
Size19 MB42 MB
Age rating12+4+
DeveloperSteffen MayerLachlan Maxwell

Bugs and requests

BMI Calculator

Reported bugs

2 issues
  • Classifies healthy weights as overweight
  • Inconsistent results across devices

Requested features

3 requests
  • More accurate BMI calculations
  • Customizable weight goals
  • Consideration for muscle mass

Retainer Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

BMI Calculator

One-time1
  • Remove Ads$2.99
None

Retainer Timer

No in-app purchases

Questions

Is BMI Calculator free?
BMI Calculator is free to download, with in-app purchases available.
Is Retainer Timer free?
Retainer Timer is free to download, with no in-app purchases.
Which has better reviews, BMI Calculator or Retainer Timer?
BMI Calculator is rated higher. BMI Calculator averages 4.5 out of 5 from 30K ratings, while Retainer Timer averages 1.0 from 2 ratings.
Do BMI Calculator or Retainer Timer have ads?
Neither BMI Calculator nor Retainer Timer shows ads.
Which is updated more often, BMI Calculator or Retainer Timer?
BMI Calculator ships an update fortnightly, and Retainer Timer fortnightly. Most recently, BMI Calculator was updated on November 8, 2026 and Retainer Timer on November 2, 2026.

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