# Mars Book vs Montana CDL Test Prep

The clearest difference is price: Mars Book at Free against Montana CDL Test Prep's $12.99. Mars Book also leads on in-app purchases (none vs 1) and update cadence (every 13 months vs every 30 months). On ads and device support there is nothing between them.

Mars Book is free to download; Montana CDL Test Prep costs $12.99 up front. Montana CDL Test Prep sells 1 one-off in-app purchase. Mars Book asks for nothing beyond the download.

Mars Book ships an update every 13 months, Montana CDL Test Prep every 30 months. The most recent releases landed on October 26, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Mars Book | Montana CDL Test Prep |
| --- | --- | --- |
| Price | **Free** | $12.99 |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/montana-cdl-test-prep/id1606932231/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 13 months** | Every 30 months |
| Monetization | — | Paid |
| Size | 14 MB | 20 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Kelvin Beecroft](https://appshunter.io/developer/301291170) |

## What reviewers say

### Mars Book

[App page](https://appshunter.io/ios/app/mars-book/id1342509724)

**In-app purchases:** none


### Montana CDL Test Prep

[App page](https://appshunter.io/ios/app/montana-cdl-test-prep/id1606932231)

Prepare for your commercial driver's license exams with over 580 practice questions covering all essential topics. Study offline, access free resources like the CDL manual, and track your progress to build confidence for the real DMV test.

**Highlights:** 580+ practice questions, Offline study mode, Includes CDL Manual and Road Signs, Preview answers and bookmark questions, Progress tracking, Printable cheat sheets, Study mode with explanations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CDL Made Easy - Full Course | $24.99 | one-time |


## Frequently asked questions

### Is Mars Book free?

Mars Book is free to download, with no in-app purchases.

### Is Montana CDL Test Prep free?

Montana CDL Test Prep costs $12.99, and also offers in-app purchases.

### Do Mars Book or Montana CDL Test Prep have ads?

Neither Mars Book nor Montana CDL Test Prep shows ads.

### Which is updated more often, Mars Book or Montana CDL Test Prep?

Mars Book ships an update every 13 months, and Montana CDL Test Prep every 30 months. Most recently, Mars Book was updated on October 26, 2026 and Montana CDL Test Prep on November 4, 2026.

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