# Crystran Optics Guide vs Driving Theory Test Prep

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.

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.

## The numbers

| Metric | Crystran Optics Guide | Driving Theory Test Prep |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 93.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 81 MB | 847 MB |
| Requires iOS | **12.2** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Michael Weston](https://appshunter.io/developer/1512664122) | [Learning Bytes](https://appshunter.io/developer/1353774607) |

## What reviewers say

### Crystran Optics Guide

[App page](https://appshunter.io/ios/app/crystran-optics-guide/id1527497029)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Driving Theory Test Prep

[App page](https://appshunter.io/ios/app/driving-theory-test-prep/id6479255527)

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.

**Highlights:** Official DVSA practice questions, Hazard perception clips, Exam readiness indicator, Mistake tracking, Smart learning algorithm, Covers all test categories

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full revision kit | $3.99 | one-time |


## Frequently asked questions

### Is Crystran Optics Guide free?

Crystran Optics Guide is free to download, with no in-app purchases.

### Is Driving Theory Test Prep free?

Driving Theory Test Prep is free to download, with in-app purchases available.

### Do Crystran Optics Guide or Driving Theory Test Prep have ads?

Neither Crystran Optics Guide nor Driving Theory Test Prep shows ads.

### Which is updated more often, Crystran Optics Guide or Driving Theory Test Prep?

Crystran Optics Guide ships an update every 8 months, and Driving Theory Test Prep every 2 months. Most recently, Crystran Optics Guide was updated on October 27, 2026 and Driving Theory Test Prep on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*