# The OOW Bible vs SailPrep

The clearest difference is in-app purchases: SailPrep at none against The OOW Bible's 5. The OOW Bible's advantage is update cadence (every 6 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. The OOW Bible sells 5 in-app purchases, starting at $2.99 per month. SailPrep asks for nothing beyond the download.

The OOW Bible ships an update every 6 days, SailPrep every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | The OOW Bible | SailPrep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Size | 100 MB | 66 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Azimuth Systems Ltd](https://appshunter.io/developer/1883659138) | [Monika Zibolyte](https://appshunter.io/developer/6772920181) |

## What reviewers say

### The OOW Bible

[App page](https://appshunter.io/ios/app/the-oow-bible/id6760291715)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Monthly | $4.99 | per month |
| Premium Annual | $39.99 | per year |
| 2 Oral Exam Sessions | $0.99 | one-time |
| 10 Oral Exam Sessions | $3.99 | one-time |


### SailPrep

[App page](https://appshunter.io/ios/app/sailprep/id6772920179)

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

**In-app purchases:** none


## Frequently asked questions

### Is The OOW Bible free?

The OOW Bible is free to download, with in-app purchases available.

### Is SailPrep free?

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

### Do The OOW Bible or SailPrep have ads?

Neither The OOW Bible nor SailPrep shows ads.

### Which is updated more often, The OOW Bible or SailPrep?

The OOW Bible ships an update every 6 days, and SailPrep every 2 weeks. Most recently, The OOW Bible was updated on October 31, 2026 and SailPrep on October 31, 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.*