Crystran Optics Guide vs Driving Theory Test Prep
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Crystran Optics Guide
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The Crystran Optics Guide has been developed to enable Optical Engineers, Students, Researchers and anyone who has an interest in Photonics to make the correct material choice for IR/UV/VIS wavelengths when designing windows, lenses, prisms, filters and beamsplitters. The calculator within the App provides quick, accurate and accessible information. TRANSMISSION An interactive table covering all wavelengths. Touch the screen on the material of interest to view the transmission graph. For further information about the material the data sheet can also be accessed, which will give additional details about any properties that may need to be taken into account, for example, hygroscopicity. REFLECTION The reflection loss for one and two faces of any given material can be calculated with the input of just a few details. Options to select any material, wavelength and angle of incidence combination quickly deliver the percentage reflection per surface along with Brewster Angle and Critical Angle. ELASTIC LIMIT Calculates the optimum thickness required for an optical window used in vacuum or pressure applications. Select material, pressure differential (in any of the most common units), shape of window and diameter to find the thickness required, with a safety factor included.
Driving Theory Test Prep
Prepare for your UK driving theory test with official DVSA practice questions and hazard perception clips. Track your progress, focus on weak areas, and achieve exam readiness with a smart algorithm. Covers all vehicle categories and is updated for 2026 tests.
- Official DVSA practice questions
- Hazard perception clips
- Exam readiness indicator
- Mistake tracking
- Smart learning algorithm
- Covers all test categories
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Use this app to prepare for the UK driving theory test and pass with flying colours, guaranteed. Why this app: β Know when you are ready: A clear exam-readiness indicator shows your progress. Reach 100% and walk into the test confident. β Mistakes: Automatically tracks incorrect answers and highlights weak areas. β Smart algorithm: See questions you struggle with more often until you master them. β Uses DVSA materials: Uses licensed DVSA materials in a clean, fast, frustration-free interface. Whatβs included: β DVSA revision content: Licensed DVSA question bank (word-for-word official content) β 800+ multiple-choice practice questions β 36 CGI hazard perception clips β 27 video case studies for learner car drivers β Traffic signs & road rules β Covers Car, Motorcycle, HGV, PCV & ADI theory tests This app is for: β Learner car drivers (Category B): Practise all official DVSA questions, hazard perception clips, and case studies. β Motorcycle learners β HGV & PCV drivers β ADI trainees: Includes the latest DVSA ADI revision bank (updated for 2026). Also: β All 27 video case studies for learner car drivers β Traffic & road signs β Updated and ready for 2025 theory tests How to use this app? β Select your theory test category β Practise DVSA questions and hazard perception clips β Review mistakes and weak topics β Watch your readiness score increase β Reach 100% - then book your test with confidence Pricing: Simple, honest pricing β Β£3.99 one-time payment β No subscriptions β No hidden charges β Use forever β Free version available to test compatibility before upgrading For more information, and free sample tests visit https://theorypass.co.uk Keywords: β Driving theory test β DVSA revision materials β Practice questions β Hazard perception β Theory test 2026 β All test types: Car, motorcycle, HGV & PCV, ADI Part 1
Screenshots
Verdict
The clearest difference is in-app purchases: Crystran Optics Guide at none against Driving Theory Test Prep's 1. Crystran Optics Guide also leads on iOS requirement (12.2 vs 16.0). Driving Theory Test Prep's advantage is update cadence (every 2 months vs every 8 months). On price, ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Driving Theory Test Prep sells 1 one-off in-app purchase. Crystran Optics Guide asks for nothing beyond the download.
Crystran Optics Guide ships an update every 8 months, Driving Theory Test Prep every 2 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.
| Parameter | Crystran Optics Guide | Driving Theory Test Prep |
|---|---|---|
| Price | Free | Free |
| Positive reviews | β | 93.0% of reviews |
| Update frequency | Every 8 months | Every 2 months β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Monetization | β | Free with in-app purchases |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 12.2 β better | 16.0 |
| Further details β not scored | ||
| Size | 81 MB | 847 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Weston | Learning Bytes |
In-app purchases
Crystran Optics Guide
No in-app purchases
Driving Theory Test Prep
- Full revision kit$3.99


