STRUCT vs PassStamp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Augmented reality visualization
- Interactive load simulations
- Pre-loaded finite element models
- Classroom and independent learning tool
- 3D model interaction
- Camera access for AR
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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.
PassStamp
Prepare for PE and FE engineering exams with NCEES-aligned practice questions and mock exams. This app offers a unique readiness score, tracks weak spots, and covers multiple engineering disciplines. Study effectively in short bursts with a one-time purchase.
- NCEES-aligned practice questions
- Separate exam and practice question banks
- Trustworthy readiness score
- Targeted study sessions
- Covers multiple FE and PE disciplines
- Full-length exam simulator
- Offline functionality
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Studying for the PE or FE while working full time? You don't have 300 spare hours, and you can't afford to walk in unsure. PassStamp is an NCEES-aligned PE and FE exam prep app built for engineers who study in the gaps - and want to know exactly where they stand before exam day. Pay once. No subscription, no monthly fee. Works offline. A REAL MEASURE, NOT THE SAME PROBLEMS ON REPEAT Most prep apps recycle the same handful of questions until you've memorized them, then call it a mock exam. PassStamp keeps two separate question banks. The practice bank is for learning - guided problems with worked solutions and instant feedback. The exam bank is held out: exam-bank questions you've never seen, kept strictly separate, so your mock exam is an honest measure of readiness - held to the NCEES blueprint, not padded with easy points. A READINESS SCORE YOU CAN TRUST Raw accuracy lies. Your PassStamp score is re-weighted by the actual NCEES exam blueprint, so it reflects how you'd perform on the real test - not how you did on whichever topics happened to come up. After every session you see your score broken down by knowledge area, with the NCEES weight beside your accuracy. You always know where the next hour should go. SESSIONS THAT TARGET YOUR WEAK SPOTS PassStamp tracks every answer and surfaces the areas dragging your score down. Your next session automatically weights toward them - so you stop re-studying what you already know. EVERY DISCIPLINE, ONE APP NCEES-mapped practice exams and question banks across the FE and PE: FE exam prep: FE Civil, FE Mechanical, FE Electrical & Computer, FE Industrial & Systems, FE Chemical, FE Environmental, FE Other Disciplines. PE exam prep: PE Civil as a separate exam for each discipline - Water Resources & Environmental, Geotechnical, Structural, Transportation, and Construction - plus PE Structural, PE Mechanical (Thermal & Fluids and HVAC & Refrigeration), PE Environmental, and PE Chemical. Every problem comes from a problem generator built on its governing equation and weighted to the NCEES blueprint - so the questions are always fresh, never a fixed set you can memorize. BUILT FOR THE REAL EXAM A full-length exam simulator locked to official NCEES specs: 80 questions / 8 hours for the PE, 110 questions / 5h20m for the FE. Or dial it down to a quick 5-question set on your commute. Timed mode for real exam pressure; untimed mode with step-by-step worked solutions for deep study. Diagrams are drawn to the numbers in your problem, and fill-in-the-blank items mirror the real CBT alternative item type. Built for mobile. Built for working engineers. Start your first practice session today.
Screenshots
Verdict
The clearest difference is rating: STRUCT at 5.0 against PassStamp's 2.0. STRUCT also leads on in-app purchases (none vs 10). On price, ratings volume, update cadence and ads 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. PassStamp sells 10 one-off in-app purchases. STRUCT asks for nothing beyond the download.
STRUCT holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Both ship on a similar rhythm, roughly every 4 weeks. The most recent releases landed on October 16, 2026 and November 5, 2026 respectively.
| Parameter | STRUCT | PassStamp |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 4 weeks | Every 4 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 165 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | UVA Apps, LLC | Ingenio Productions LLC |
Customer experience
STRUCT
PassStamp
In-app purchases
STRUCT
No in-app purchases
PassStamp
- FE Civil Exam Prep$24.99
- FE Environmental Exam Prep$24.99
- FE Chemical Exam Prep$24.99
Show 7 moreShow fewer
- FE Industrial & Systems Prep$24.99
- PE Mech: Machine Design$34.99
- PE Civil: Structural Exam Prep$34.99
- PE Civil: WRE Exam Prep$34.99
- PE Civil: Construction Exam Prep$34.99
- PE Civil: Geotechnical Exam Prep$34.99
- PE Civil: Transportation Exam Prep$34.99
Questions
Is STRUCT free?
Is PassStamp free?
Which has better reviews, STRUCT or PassStamp?
Do STRUCT or PassStamp have ads?
Which is updated more often, STRUCT or PassStamp?
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