AAOS Code vs What's the Skeletal Maturity?
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AAOS Code
This medical reference app provides orthopaedic CPT codes, ICD-10 codes, and RVUs for quick access on mobile devices. It allows users to search by code or body site, email patient information with codes, calculate Work RVUs, and save favorite codes.
- Orthopaedic CPT codes
- ICD-10 codes
- RVU calculations
- Search by code and body site
- Email patient information
- Favorite code tracking
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Published by the American Academy of Orthopaedic Surgeons®, Code X Lite (X-Lite) is Code X's built-in companion for immediate, on the go coding. The robust application offers a full range of orthopaedic CPT codes, ICD-10 codes and RVUs. The application allows you to search by code and body site, e-mail patient information with the applicable code, calculate Work RVUs, and track your favorite codes. For AAOS Code-X Web Subscribers please login to your cloud based Code-X account at https://codex.aaos.org. Then click on your initials, followed by your name to get your credentials to login to Code-X Lite. If you are not an AAOS Code-X Web Subscriber you will not have access to this application.
What's the Skeletal Maturity?
This medical tool helps clinicians quickly estimate the skeletal age of pediatric patients. It supports multiple evidence-based ossification systems for various joints, including the hand, wrist, elbow, hip, and knee.
- Estimates skeletal age of pediatric patients
- Uses evidence-based ossification systems
- Supports multiple joint systems (shoulder, elbow, hand, wrist, hip, knee, heel)
- Rapid and accurate estimations
- Utilizes orthopaedic radiographs
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This is an evidence-based tool that allows clinicians to estimate skeletal age of pediatric patients rapidly and accurately using any orthopaedic radiograph. Skeletal maturity systems supported: Proximal Humerus Ossification System (Shoulder) Olecranon Apophyseal Ossification System (Elbow) Sanders Hand System (Hand) Pre-adolescent Fels Wrist System (Wrist) Modified Fels Wrist System (Wrist) Optimized Oxford Hip Skeletal Maturity System (Hip) Pre-Adolescent Fels Knee System (Knee) Modified Fels Knee Skeletal Maturity System (Knee) Abbreviated Fels Knee System (Knee) Calcaneal Apophysis Ossification Staging System (Heel)
Screenshots
Verdict
The clearest difference is rating: What's the Skeletal Maturity? at 5.0 against AAOS Code's 2.3. What's the Skeletal Maturity? also leads on update cadence (monthly vs every 3 months) and ratings volume (10 vs 3). On price, ads, in-app purchases and monetization model 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.
What's the Skeletal Maturity? holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 10 respectively.
AAOS Code ships an update every 3 months, What's the Skeletal Maturity? monthly. The most recent releases landed on July 7, 2026 and June 6, 2026 respectively.
| Parameter | AAOS Code | What's the Skeletal Maturity? |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (3 ratings) | 5.0 (10 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 3 | 10 — better |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 148 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Computer Architechs International Corporation | Raymond Liu |
Customer experience
AAOS Code
What's the Skeletal Maturity?
In-app purchases
AAOS Code
No in-app purchases
What's the Skeletal Maturity?
No in-app purchases
Questions
Is AAOS Code free?
Is What's the Skeletal Maturity? free?
Which has better reviews, AAOS Code or What's the Skeletal Maturity??
Do AAOS Code or What's the Skeletal Maturity? have ads?
Which is updated more often, AAOS Code or What's the Skeletal Maturity??
Other comparisons
