Comparison

Multiplier vs Easy Bone Age Atlas

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

Head to head
About

Multiplier

This app automates complex calculations for predicting mature height, bone length, and limb length discrepancies in children. It simplifies manual methods, reducing calculation time and errors for various orthopedic and growth-related assessments.

Highlights
  • Predict mature height
  • Calculate bone length
  • Assess limb length discrepancy
  • Analyze growth remaining
  • Plot height on CDC charts
  • Scanogram calculations
  • Foot length analysis
Features
Read full description

The Multiplier App automates calculations to predict mature height and bone length in children. This method was created originally in Baltimore at the University of Maryland and subsequently developed at the International Center for Limb Lengthening (ICLL), Rubin Institute for Advanced Orthopedics (RIAO), Sinai Hospital of Baltimore. We have taught the Multiplier Method for more than 19 years at our annual Baltimore Limb Deformity Course (http://www.DeformityCourse.com). These calculations are typically performed by hand, using various formulae. Certain calculations are easy, but others involve more complicated formulae. Utilizing this app will reduce the time needed for these routine calculations and decrease errors. You need only input certain data (sex, age, length) and the app will calculate the answer by using the appropriate Multiplier formula. The Multiplier App will allow you to make the following calculations: LOWER EXTREMITY · Limb Length Discrepancy (LLD) (Congenital) · LLD (Developmental) · Growth Remaining · Bone Length · Timing of Angular Correction · Timing of Epiphysiodesis · Comprehensive (Congenital) LLD and Epiphysiodesis · Scanogram Calculations (Calculates femur/tibia lengths, overall limb length discrepancy, and amount/side of femur/tibia discrepancies) UPPER EXTREMITY · LLD (Congenital) · LLD (Developmental) · Growth Remaining · Bone Length Height and CDC Growth Charts (Calculates height at maturity, calculates height at every age, and plots the patient’s height and weight on the CDC growth charts) ACHONDROPLASIA · Height · Sitting Height · Leg Length Fetus (Calculates the length of tibia or femur at birth and maturity) FOOT · Foot Length · Foot Length Discrepancy · Foot Height · Foot Height Discrepancy Spine (Calculates sitting height at maturity) Oblique Plane Deformity (Calculates magnitude, orientation, and direction of an oblique plane deformity) Inclined Osteotomy (Calculates the rotational orientation and the vertical inclination of the osteotomy) This app also provides the following additional resources: · Bone Age: Elbow and Hand (Shows how to determine skeletal age by using radiographs of the elbow or hand) · Figures that show the standard measurements for the lower limb and foot · The multiplier formulae that the app uses to perform the calculations · Tables that show the multiplier values that are used in the formulae · Figures that show the Solomin Foot Analysis (Deformity correction planning for the midfoot, hindfoot, and ankle using reference lines and angles provided by Dr. Leonid Solomin) · Figures that show the development of the apophyses, epiphyses, and bones · Bibliography · User guide DISCLAIMER: No growth prediction method is 100% accurate; this App is not a substitute for sound and careful clinical judgment. PRIVACY POLICY: We respect the privacy of the people who use the International Center for Limb Lengthening apps. The Multiplier app does not collect, use, or distribute any data from the users.

About

Easy Bone Age Atlas

A clinical reference tool for evaluating skeletal maturity in children and adolescents. It offers detailed images and a height prediction calculator to aid healthcare providers in assessing growth and providing insights to families.

Highlights
  • Detailed skeletal development images
  • Age-appropriate image comparison
  • Adult height prediction calculator
  • User-friendly clinical reference
  • Supports boys and girls 10 months to 18 years
Features
Read full description

A comprehensive bone age atlas designed for effortless use in clinical settings. This user-friendly reference tool provides instant access to detailed skeletal development images spanning from 10 months to 18 years for both boys and girls, making it simple to quickly reference standards during patient consultations. Healthcare providers can easily navigate through age-appropriate images, smoothly compare patient radiographs with established norms, and make confident assessments about skeletal maturity—all within minutes during routine appointments. The atlas also includes an intuitive adult height prediction calculator that works seamlessly with your bone age evaluations, helping you provide families with valuable growth insights without disrupting your clinic workflow. Whether you're seeing patients in a busy pediatric practice or radiology department, this comprehensive atlas integrates naturally into your day, supporting quality patient care with minimal effort. https://hvalabs.com/terms-and-conditions/

Screenshots

Multiplier4 screens
Easy Bone Age Atlas4 screens

Verdict

The call

The clearest difference is review sentiment: Multiplier at 83% against Easy Bone Age Atlas's 0%. Multiplier also leads on rating (4.6 vs 1.0) and in-app purchases (none vs 3). On price and update cadence 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. Easy Bone Age Atlas sells 3 in-app purchases, starting at $4.99 per month. Multiplier asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Multiplier holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Multiplier has 24 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of Multiplier's written reviews are positive against 0% of Easy Bone Age Atlas's.

UpkeepUpdate frequency

Multiplier ships an update every 6 months, Easy Bone Age Atlas every 8 months. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard8 real differences · 2 level
Multiplier versus Easy Bone Age Atlas: the parameters behind the verdict, then further details
ParameterMultiplierEasy Bone Age Atlas
PriceFreeFree
Rating4.6 (24 ratings) — better1.0 (1 ratings)
Positive reviews83.3% of reviews — better0.0% of reviews
Number of ratings24 — better1
Update frequencyEvery 6 months — betterEvery 8 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better17.0
Further details — not scored
Size62 MB49 MB
Age rating12+17+
DeveloperLifeBridge HealthHVALABS, LLC

Customer experience

Multiplier

All ratings24 ratings
Positive95.8%
Neutral0.0%
Negative4.2%
Written reviews30 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Easy Bone Age Atlas

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Multiplier

No in-app purchases

3 purchases

Easy Bone Age Atlas

Subscriptions3
  • Monthly Premium7 Days trial$4.991 Month
  • Annual Premium Discount$19.991 Year
  • Annual Premium7 Days trial$34.991 Year

Questions

Is Multiplier free?
Multiplier is free to download, with no in-app purchases.
Is Easy Bone Age Atlas free?
Easy Bone Age Atlas is free to download, with in-app purchases available.
Which has better reviews, Multiplier or Easy Bone Age Atlas?
Multiplier is rated higher. Multiplier averages 4.6 out of 5 from 24 ratings, while Easy Bone Age Atlas averages 1.0 from 1 ratings.
Do Multiplier or Easy Bone Age Atlas have ads?
Easy Bone Age Atlas shows ads; Multiplier does not.
Which is updated more often, Multiplier or Easy Bone Age Atlas?
Multiplier ships an update every 6 months, and Easy Bone Age Atlas every 8 months. Most recently, Multiplier was updated on November 1, 2026 and Easy Bone Age Atlas on November 5, 2026.

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