Comparison

Free vs STRUCT

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

Head to head
About

Free

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This app consists of multiple mini games in which users learn and practice skills critical to the development of Free-Body Diagrams. This is a fundamental skill for engineers, generally learned in an Introduction to Statics or Mechanics course. The app provides users with asynchronous opportunities for training, varied tasks that target specific FBD issues, and several levels of immediate feedback.

About

STRUCT

Explore structural engineering concepts in augmented reality. Visualize how beams and bridges react to loads in your own space, offering an interactive and engaging learning experience for students. No complex setup required, just your device and camera.

Highlights
  • Augmented reality visualization
  • Interactive load simulations
  • Pre-loaded finite element models
  • Classroom and independent learning tool
  • 3D model interaction
  • Camera access for AR
Features
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Have you ever wanted to see how a beam or bridge you encounter in everyday life reacts when load is applied? What if you could see these in your space at all angles, without having to specify material types, meshing or boundary conditions? STRUCT-AR utilizes finite element models pre-loaded into this mobile AR application that allows users to interact and engage with the models on their mobile device or tablet. This can be used as a complementary teaching tool for enhancing personalized learning wherein students can leverage the technology as a learning companion both within the classroom and outside to better understand structural behaviors and mechanisms that are challenging to convey in a traditional 2D learning environment. To use the app, you must allow it to access your camera. No identifiable data is stored on any server and you can revoke access at any time.

Screenshots

Free4 screens
STRUCT4 screens

Verdict

The call

The clearest difference is update cadence: Free at every 4 days against STRUCT's every 4 weeks. Free also leads on iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support 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.

UpkeepUpdate frequency

Free ships an update every 4 days, STRUCT every 4 weeks. The most recent releases landed on October 27, 2026 and October 16, 2026 respectively.

Scorecard2 real differences · 7 level
Free versus STRUCT: the parameters behind the verdict, then further details
ParameterFreeSTRUCT
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 4 days — betterEvery 4 weeks
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size602 MB165 MB
Age rating4+4+
DeveloperWorcester Polytechnic InstituteUVA Apps, LLC

In-app purchases

None

Free

No in-app purchases

None

STRUCT

No in-app purchases

Questions

Is Free free?
Free is free to download, with no in-app purchases.
Is STRUCT free?
STRUCT is free to download, with no in-app purchases.
Do Free or STRUCT have ads?
Neither Free nor STRUCT shows ads.
Which is updated more often, Free or STRUCT?
Free ships an update every 4 days, and STRUCT every 4 weeks. Most recently, Free was updated on October 27, 2026 and STRUCT on October 16, 2026.

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