Comparison

AO Surgery Reference vs Smile Train

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

Head to head
About

AO Surgery Reference

Access a comprehensive online repository of surgical knowledge for fracture management. It provides detailed guidance on diagnosis, treatment, and aftercare for numerous fracture types, supported by extensive illustrations and expert review.

Highlights
  • 353 fracture types covered
  • 172 surgical approaches
  • 1222 surgical procedures
  • Over 30,000 illustrations
  • Feline, canine, and equine fracture care
  • Powerful search function
Features
Read full description

QUICK ONLINE REFERENCE IN CLINICAL LIFE Gain easy access to the award-winning AO Surgery Reference. AO Surgery Reference is an online repository for surgical knowledge. It describes the complete surgical management process from diagnosis to aftercare for all fractures of a given anatomical region, and also assembles relevant material that the AO has published before. It gives access to:   • aid in surgical decision making for 353 fracture types • 172 approaches • 1222 surgical procedures • all richly illustrated with more than 30'000 Illustrations and much more. To ensure the quality of the content, it is authored, edited, and peer reviewed by experienced AO Faculty from all over the world, some of which are also well-known textbook authors/editors. This is a relaunch of the AO Surgery Reference app utilizing the same responsive user interface that was released February 2020. The highlights are: • Consistent navigational logic and user experience on all screen sizes • Inclusion of feline, canine, and equine fracture care • Combination of Preparation – Approach – Reduction and Fixation – Aftercare into one step called treatment. • Introduction of a powerful search function, allowing simplifications of the user interface as it replaces previous shortcuts.

About

Smile Train

Features
Read full description

The Smile Train Virtual Surgery Simulator An interactive way of learning cleft surgical techniques Smile Train, the world's largest cleft charity, has partnered with BioDigital to launch the first web-based, 3D, interactive surgical explorer for cleft care. The Smile Train Virtual Surgery Simulator provides surgeons around the world with next generation surgical training technology for learning surgical techniques in cleft lip and palate repair. Through leveraging state-of-the-art technology, Smile Train and BioDigital aim to change the world, one smile at a time. FEATURES * Interactive Exploration: Explore the virtual cleft lip and palate in interactive 3D * Simulation of Surgical Procedures: Interact with primary and secondary cleft repairs step by step * Descriptions and Audio: Read and listen to chapters detailing each step of the procedures * Live Surgical Videos: Access live surgical video at each step of the procedure * Expert Tutorials: Follow expert opinion on critical landmarks and incisions * Quiz Engine: Test your knowledge using the quiz engine Smile Train's VISION Every child born with a cleft - anywhere in the world - should have the opportunity to live a full and productive life. Smile Train supports innovative education and training programs, including the Cleft Surgical Simulator, to empower local medical professionals to provide safe, quality, timely, free and cost-effective comprehensive cleft treatment for the millions of poor children around the world who suffer from cleft lip and/or palate.

Screenshots

AO Surgery Reference4 screens
Smile Train4 screens

Verdict

The call

AO Surgery Reference and Smile Train are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

UpkeepUpdate frequency

AO Surgery Reference ships an update every 6 months, Smile Train every 4 months. The most recent releases landed on October 11, 2026 and September 30, 2026 respectively.

ScorecardNo meaningful differences
AO Surgery Reference versus Smile Train: the parameters behind the verdict, then further details
ParameterAO Surgery ReferenceSmile Train
PriceFreeFree
Rating4.4 (14 ratings) — better—
Positive reviews85.8% of reviews—
Number of ratings14 — better—
Update frequencyEvery 6 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size1 MB64 MB
Age rating17+17+
DeveloperAO FoundationBioDigital, Inc.

In-app purchases

None

AO Surgery Reference

No in-app purchases

None

Smile Train

No in-app purchases

Questions

Is AO Surgery Reference free?
AO Surgery Reference is free to download, with no in-app purchases.
Is Smile Train free?
Smile Train is free to download, with no in-app purchases.
Do AO Surgery Reference or Smile Train have ads?
Neither AO Surgery Reference nor Smile Train shows ads.
Which is updated more often, AO Surgery Reference or Smile Train?
AO Surgery Reference ships an update every 6 months, and Smile Train every 4 months. Most recently, AO Surgery Reference was updated on October 11, 2026 and Smile Train on September 30, 2026.

Other comparisons