608 Practice vs Visual3D App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
608 Practice
Prepare for your EPA 608 certification with hundreds of up-to-date practice questions. The app offers both a practice mode and a timed test mode with detailed review to help you identify areas needing improvement across Core, Type I, Type II, and Type III exams.
- Hundreds of practice questions
- Up-to-date content (2018-2020)
- Core, Type I, II, III exam sections
- Practice mode
- Timed test mode
- Review missed questions
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Prepare for your Section 608 certification exam with the most comprehensive study app available. Whether you're going for Type I, Type II, Type III, or Universal certification, 608 Practice has everything you need to pass. Hundreds of Practice Questions Study from a massive question bank covering all four exam sections: Core, Type I, Type II, and Type III. Every question has four answer options and a detailed explanation, just like the real exam. New questions are added regularly. Pressure-Temperature Chart Questions Practice reading PT charts the way you will on the real exam. An interactive chart covering R-22, R-134a, R-410A, R-404A, and R-32 is built right into the questions. Calculate superheat, subcooling, identify refrigerants, and compare pressures across different refrigerants. 5 Study Modes Per Section Cram Mode - Read through every question with the correct answer and explanation shown. Absorb the material before testing yourself. Study - Answer questions at your own pace with instant feedback. Your position is saved so you can pick up where you left off. Smart Practice - The app tracks what you get wrong and builds focused sessions around your weak spots. 75% of questions come from your weakest areas, 25% from material you haven't seen yet. Questions you master (3 correct in a row) are excluded so you spend time where it matters. Mock Exam - Simulate the real exam with 25 random questions. 72% required to pass, just like the actual certification test. Review your answers with full explanations after each attempt. Most Missed - See which questions you get wrong most often, organized by section. As you master questions, they leave the list automatically. Track Your Progress Study streak counter to keep you motivated Per-section readiness scores Mastery tracking for every question (3 correct answers in a row = mastered) Best test scores by section Full history of practice and test results Study Reminders Set daily or weekly notifications to keep your study habit consistent. Choose your preferred time and frequency. Works Offline All questions are stored on your device. Study anywhere, anytime, with no internet required. Questions sync automatically in the background when updates are available. Built for the Real Exam 72% passing score, matching the actual Section 608 exam 25 questions per test, same as the certification Four answer options per question, just like the real thing Covers all current regulations including the AIM Act and 2026 rule changes Privacy First No account required. No personal data collected. All your progress stays on your device.
Visual3D App
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Visual3D is a simple app for HVAC technicians. It helps you visualize systems and troubleshoot issues easily. Work smarter with clear 3D models and helpful tools. Terms of Use (EULA): https://visual3dacademy.com/eula
Screenshots
Verdict
The clearest difference is price: Visual3D App at Free against 608 Practice's $12.99. 608 Practice's advantage is in-app purchases (none vs 1) and chart position (#13 vs unranked). On update cadence, ads, device support and iOS requirement 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
Visual3D App is free to download; 608 Practice costs $12.99 up front. Visual3D App sells 1 in-app purchase, starting at $12.95 per month. 608 Practice asks for nothing beyond the download.
608 Practice ships an update every 6 weeks, Visual3D App every 2 months. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.
| Parameter | 608 Practice | Visual3D App |
|---|---|---|
| Price | $12.99 | Free — better |
| Rating | 3.9 (118 ratings) — better | — |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 118 — better | — |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Best chart rank | #13 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 28 MB | 168 MB |
| Age rating | 4+ | 17+ |
| Developer | After Hours Data Systems LLC | Nauman Innovation Group LLC |
Bugs and requests
608 Practice
Reported bugs
10 issues- App crashes
- App freezes
- Screen rotation causes app to stop working
- Answers marked incorrectly
- App not working with iOS 13
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- Cannot see or scroll to bottom of app
- Questions and answers show as undefined
- Answers change after moving to next question
- Cannot go back during tests
- Review portion of tests not fully visible
Requested features
9 requests- Restore old version
- Allow viewing all questions
- Add mode for fewer questions
- Shuffle questions option
- Bookmark questions
Show 4 moreShow fewer
- Landscape mode for iPads
- Explain wrong answers
- Update for new regulations
- Mark study progress
Visual3D App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
608 Practice
No in-app purchases
Visual3D App
- Single User Package$12.951 Month
Questions
Is 608 Practice free?
Is Visual3D App free?
Do 608 Practice or Visual3D App have ads?
Which is updated more often, 608 Practice or Visual3D App?
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