Multiplier vs Implant Identifier
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Predict mature height
- Calculate bone length
- Assess limb length discrepancy
- Analyze growth remaining
- Plot height on CDC charts
- Scanogram calculations
- Foot length analysis
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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.
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.
- AI-Identify for Hips
- Community Feed for Expert Help
- Filterable Implant Library
- Submit New Implants
- My Implants History
- X-ray Recognition
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | Multiplier | Implant Identifier |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (24 ratings) — better | 4.6 (189 ratings) |
| Positive reviews | 83.3% of reviews — better | 63.3% of reviews |
| Number of ratings | 24 | 189 — better |
| Update frequency | Every 7 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 62 MB | 128 MB |
| Age rating | 12+ | 12+ |
| Developer | LifeBridge Health | Devise Health |
Customer experience
Multiplier
Implant Identifier
In-app purchases
Multiplier
No in-app purchases
Implant Identifier
No in-app purchases
Questions
Is Multiplier free?
Is Implant Identifier free?
Which has better reviews, Multiplier or Implant Identifier?
Do Multiplier or Implant Identifier have ads?
Which is updated more often, Multiplier or Implant Identifier?
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