Comparison

Bone Ninja vs AONA Events

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

Head to head
About

Bone Ninja

This educational tool helps orthopedic surgeons learn to analyze and correct long bone deformities using digital radiographs. It provides tools for measurement, drawing, and simulating osteotomy solutions, based on established surgical methodology.

Highlights
  • Radiograph analysis of bone deformities
  • Digital measurement and drawing tools
  • Osteotomy simulation with cut-out tool
  • Upload and analyze personal radiographs
  • Comparison with suggested correction solutions
  • Educational tool based on established methodology
Features
Read full description

Bone Ninja is a teaching tool developed by two orthopedic surgeons who specialize in limb deformity correction: Dr. Shawn Standard and Dr. John Herzenberg. It is designed to help surgeons learn to analyze long bone deformities. Bone Ninja comes pre-loaded with radiographs of normal legs and deformed legs. You can analyze the provided cases or upload your own. Once your analysis is complete, you can then use the cut-out tool to try different osteotomy solutions. Suggested solutions for the provided cases are available for comparison. Bone Ninja includes tools for drawing lines, measuring angles, measuring lengths, and calibrating the magnification. The cutting tool allows you to manipulate one or more fragments to simulate correction of single or multilevel deformities. The analysis of the radiographs is based on methodology taught at our annual Baltimore Limb Deformity Course (BLDC), now in its 22nd year (DeformityCourse.com). We developed this app to supplement the BLDC and look forward to feedback from attendees and other users. Bone Ninja is not presented as a clinical tool, but rather an educational tool. It will not “automatically” analyze deformities. The student must first learn the methodology of analyzing and planning deformity correction in order to use Bone Ninja. Bone Ninja is a 21st century mobile alternative to pencil, ruler, goniometer, and paper. Bone Ninja will be periodically updated by adding more case examples, more explanations, and more tools. The name “Bone Ninja” is intentionally whimsical and reflects our philosophy of teaching as “infotainment.” Enjoy! Disclaimer The Bone Ninja App is designed for educational purposes only. The intent is to train physicians how to analyze long bone deformities. The Bone Ninja App is not intended to be used for medical diagnosis or treatment. In view of the possibility of human error or changes in medical science, neither the authors nor the developer warrant that the information contained in this software is accurate or complete and they are not responsible for any errors or omissions or the results obtained from the use of such information.

About

AONA Events

Access all information for AO North America courses, including schedules, materials, venue details, and faculty bios. You can also access your CME directly within the application.

Highlights
  • View event schedules
  • Access course materials
  • Venue information
  • Faculty biographies
  • Direct CME access
Features
Read full description

The AO North America Event app is a resource for you while attending one of our courses. You can stay up to date and informed about our current and future events right at your fingertips. Designed as your single go-to source, you can: view schedules, course materials, venue information and faculty bios. You can access your CME directly from the app.

Screenshots

AONA Events4 screens

Verdict

The call

The clearest difference is price: AONA Events at Free against Bone Ninja's $49.99. AONA Events also leads on rating (5.0 vs 3.8) and update cadence (every 2 months vs every 4 months). Bone Ninja's advantage is iOS requirement (8.0 vs 12.2). On ratings volume, 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

AONA Events is free to download; Bone Ninja costs $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

AONA Events holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 90% of Bone Ninja's written reviews are positive against 100% of AONA Events's.

UpkeepUpdate frequency

Bone Ninja ships an update every 4 months, AONA Events every 2 months. The most recent releases landed on October 26, 2026 and October 21, 2026 respectively.

Scorecard7 real differences · 3 level
Bone Ninja versus AONA Events: the parameters behind the verdict, then further details
ParameterBone NinjaAONA Events
Price$49.99Free — better
Rating3.8 (4 ratings)5.0 (3 ratings) — better
Positive reviews90.0% of reviews100.0% of reviews — better
Number of ratings4 — better3
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better12.2
Further details — not scored
Size34 MB215 MB
Age rating4+12+
DeveloperLifeBridge HealthThe AO North America Inc

Customer experience

Bone Ninja

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive90.0%
Neutral10.0%
Negative0.0%

AONA Events

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Bone Ninja

No in-app purchases

None

AONA Events

No in-app purchases

Questions

Is Bone Ninja free?
Bone Ninja costs $49.99, with no in-app purchases.
Is AONA Events free?
AONA Events is free to download, with no in-app purchases.
Which has better reviews, Bone Ninja or AONA Events?
AONA Events is rated higher. Bone Ninja averages 3.8 out of 5 from 4 ratings, while AONA Events averages 5.0 from 3 ratings.
Do Bone Ninja or AONA Events have ads?
Neither Bone Ninja nor AONA Events shows ads.
Which is updated more often, Bone Ninja or AONA Events?
Bone Ninja ships an update every 4 months, and AONA Events every 2 months. Most recently, Bone Ninja was updated on October 26, 2026 and AONA Events on October 21, 2026.

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