Comparison

Multiplier vs Implant Identifier

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

Implant Identifier

Instantly identify orthopedic and spine implants from X-rays using AI. This app helps medical professionals recognize unknown implants, access a community of experts, and contribute to a growing library of implant data. Features include AI identification for hips, a community feed for assistance, and a filterable implant library.

Highlights
  • AI-Identify for Hips
  • Community Feed for Expert Help
  • Filterable Implant Library
  • Submit New Implants
  • My Implants History
  • X-ray Recognition
Features
Read full description

Implant Identifier is the fastest way to identify unknown orthopedic and spine implants from x-ray. Now you can instantly identify spine, hip, knee, and shoulder implants with AI. Join our mission to create the world’s most intelligent implant identification platform—powered by AI, built by the community. The new app includes: AI-Identify for Spine, Hip, Knee, and Shoulder – Snap an x-ray and let AI suggest the closest matching implants. Home Feed (Community) – Can't find a match? Ask expert's in our community of surgeons and reps worldwide. Library with Filters – Browse and filter hundreds of common spine and orthopedic implant x-rays. Submit New Implants – Contribute to the growing AI-library and help others in the community. My Implants- Access your previously identified and unidentified implants and share them with your colleagues.

Screenshots

Multiplier4 screens
Implant Identifier4 screens

Verdict

The call

The clearest difference is update cadence: Implant Identifier at every 3 weeks against Multiplier's every 7 months. Implant Identifier also leads on monetization model (free with in-app purchases vs paid) and ratings volume (189 vs 24). Multiplier's advantage is review sentiment (83% vs 63%) and iOS requirement (13.0 vs 15.5). On price, rating, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Multiplier against 4.6 for Implant Identifier. That said, the two scores are not equally well evidenced: Implant Identifier has 189 ratings behind it against 24, so its average is the more settled of the two. Written reviews are what separate them: 83% of Multiplier's written reviews are positive against 63% of Implant Identifier's.

UpkeepUpdate frequency

Multiplier ships an update every 7 months, Implant Identifier every 3 weeks. The most recent releases landed on July 2, 2026 and September 22, 2026 respectively.

Scorecard5 real differences · 5 level
Multiplier versus Implant Identifier: the parameters behind the verdict, then further details
ParameterMultiplierImplant Identifier
PriceFreeFree
Rating4.6 (24 ratings) — better4.6 (189 ratings)
Positive reviews83.3% of reviews — better63.3% of reviews
Number of ratings24189 — better
Update frequencyEvery 7 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.5
Further details — not scored
Size62 MB128 MB
Age rating12+12+
DeveloperLifeBridge HealthDevise Health

Customer experience

Multiplier

All ratings23 ratings
Positive95.7%
Neutral0.0%
Negative4.3%
Written reviews30 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Implant Identifier

All ratings189 ratings
Positive89.4%
Neutral2.1%
Negative8.5%
Written reviews30 reviews
Positive63.3%
Neutral3.3%
Negative33.3%

In-app purchases

None

Multiplier

No in-app purchases

None

Implant Identifier

No in-app purchases

Questions

Is Multiplier free?
Multiplier is free to download, with no in-app purchases.
Is Implant Identifier free?
Implant Identifier is free to download, with no in-app purchases.
Which has better reviews, Multiplier or Implant Identifier?
Multiplier is rated higher. Multiplier averages 4.6 out of 5 from 24 ratings, while Implant Identifier averages 4.6 from 189 ratings.
Do Multiplier or Implant Identifier have ads?
Neither Multiplier nor Implant Identifier shows ads.
Which is updated more often, Multiplier or Implant Identifier?
Multiplier ships an update every 7 months, and Implant Identifier every 3 weeks. Most recently, Multiplier was updated on July 2, 2026 and Implant Identifier on September 22, 2026.

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